What is Medicare Advantage?

Medicare Advantage, also called Part C, is offered by private insurance companies approved by Medicare. It usually combines Part A, Part B, and often Part D prescription drug coverage.

What is the difference between Original Medicare and Medicare Advantage?

Original Medicare is run by the federal government and lets you use any provider that accepts Medicare. Medicare Advantage is offered by private insurers and often uses provider networks.

What is Medicare Supplement or Medigap?

Medicare Supplement, also called Medigap, works with Original Medicare to help reduce out-of-pocket costs. It can help cover certain copays, coinsurance, and deductibles.

Does Medigap include prescription drug coverage?

Medigap plans sold today do not include prescription drug coverage. Most people need a separate Medicare Part D plan for medications.

What is Medicare Part D?

Medicare Part D is prescription drug coverage offered by private insurance companies approved by Medicare. It helps cover medication costs based on the plan’s formulary.

When is the Medicare Annual Enrollment Period?

The Medicare Annual Enrollment Period usually runs from October 15 to December 7 each year. During this time, many people can review or change Medicare Advantage and Part D plans.

Can I switch Medicare Advantage plans later?

Yes, but timing matters. Most people can switch during Annual Enrollment, Medicare Advantage Open Enrollment, or a qualifying Special Enrollment Period.

What is the difference between HMO and PPO Medicare Advantage plans?

HMO plans usually require in-network care and may need referrals. PPO plans generally offer more provider flexibility but may cost more for out-of-network care.

Do Medicare Advantage plans require prior authorization?

Many Medicare Advantage plans require prior authorization for certain services. This can include imaging, surgeries, skilled nursing care, or other covered treatments.

Do Medicare Advantage plans have an out-of-pocket limit?

Yes, Medicare Advantage plans include an annual maximum out-of-pocket limit for covered medical services. Original Medicare does not include this protection by itself.

Why do Medicare plans change every year?

Plans may update premiums, copays, drug formularies, provider networks, and benefits each year. Reviewing your plan annually helps avoid unexpected changes.

How can I find a Medicare plan that includes my doctor?

You should check the plan’s provider network before enrolling. A local Medicare agent can help confirm whether your doctors and hospitals are included.

IRMAA is an income-related adjustment that can increase Medicare Part B and Part D premiums. It is based on your reported income from prior tax years.

What is a Special Enrollment Period?

A Special Enrollment Period allows certain Medicare changes outside normal enrollment windows. Qualifying events may include moving, losing coverage, or plan changes.

Why work with a local Medicare agent?

A local Medicare agent can help compare plan options, explain networks, and review coverage based on your area. This can make Medicare decisions easier to understand.

Medicare Formulary Explained: How Drug Coverage, Tiers, and Costs Work

January 9, 2026

Understanding a Medicare formulary helps you know which drugs your plan covers and how much you’ll pay. A formulary is the official drug list your Medicare plan uses to decide coverage, cost tiers, and any rules like prior authorization or step therapy—so checking it can save you money and avoid surprises at the pharmacy.

This article will walk you through how formularies work, the types and tiers you might see, and what to do when a drug isn’t covered.

You don’t have to figure this out alone. The Modern Medicare Agency connects you with licensed agents who talk with you one-on-one, compare plans based on your prescriptions, and help find coverage that fits your budget without extra fees.

Keep reading to learn how to use a formulary, handle changes, and lower your prescription costs.

What Is a Medicare Formulary?

A Medicare formulary lists the prescription drugs a plan covers, shows cost tiers, and notes limits like prior authorization. It tells you which drugs you can fill and how much you may pay at the pharmacy.

Definition and Purpose

A formulary is a plan’s official drug list for Medicare Part D and Medicare Advantage plans with drug coverage. It names both brand-name and generic medicines that the plan will pay for either fully or partially.

Formularies also organize drugs into tiers—usually lower tiers mean lower copays. The main purpose is to guide your coverage choices and predict out-of-pocket costs.

It helps you compare plans by checking if your current medicines are covered. If a drug isn’t listed, you may pay the full cost unless you request an exception or appeal.

How Formularies Work in Medicare

Each Medicare Part D or Medicare Advantage plan maintains its own formulary, so coverage varies by plan and can change each year. Plans place drugs into tiers that affect your copay or coinsurance.

Common rules you’ll see include prior authorization (approval before coverage), step therapy (try a cheaper option first), and quantity limits. You should review the formulary during open enrollment and when your medicines change.

If your drug needs a prior authorization, your prescriber submits paperwork. If a drug is not covered, you can ask the plan for an exception or speak with one of our licensed agents at The Modern Medicare Agency to find a plan that lists your medicines.

Key Differences From Commercial Formularies

Medicare formularies follow federal rules, but plans still have flexibility in drug choices and tier placement. Commercial formularies (employer or private insurance) may use different tier structures, network rules, or rebate arrangements that change cost-sharing for the same drug.

Another difference is appeals and protections. Medicare offers a formal exception and appeals process designed for beneficiaries.

Commercial plans might have different timelines or internal review steps. If you want direct help comparing formularies and finding plans that match your meds and budget, The Modern Medicare Agency provides licensed agents you can talk to one-on-one who will search options without adding extra fees.

Types of Medicare Formularies

Formularies differ by plan type, what drugs they list, and how they group costs and rules. You’ll learn how Part D and Medicare Advantage formularies work and the key differences between standard and custom lists.

Medicare Part D Formularies

Medicare Part D formularies list drugs covered by standalone prescription plans. Each plan must include at least two drugs in six protected classes by law, but plans vary on specific brand and generic options.

Formularies use tiers—usually 5 tiers in 2025—to set cost sharing. Lower tiers cover generics and preferred generics; higher tiers cover brand-name, specialty, or non-preferred drugs.

Plans often apply restrictions like prior authorization, step therapy, and quantity limits. These rules can affect your out-of-pocket cost and access.

You should check a plan’s formulary before enrolling to confirm your regular medicines are covered and learn what tiers and restrictions apply.

Medicare Advantage Drug Formularies

Medicare Advantage plans that include drug coverage (MA-PD) combine medical and prescription benefits. Their formularies work like Part D but can integrate care coordination features.

You get one ID card and a single plan network for medical and pharmacy benefits in many cases. MA-PD formularies may offer different preferred pharmacies or tiered copays tied to plan networks.

They also follow federal rules for protected classes, but drug choices and utilization rules can differ from standalone Part D plans. Ask an agent to compare formulary details, network pharmacy lists, and any extra plan incentives that lower your prescription costs.

Standard vs. Custom Formularies

Standard formularies follow common tier structures and include most widely used drugs across classes. They make it easier to compare plans because many plans use a similar baseline of covered medicines.

Standard lists often simplify switching between plans without large coverage gaps. Custom formularies let plans target specific drugs or cost strategies.

They may favor certain generics, include selective brands, or apply unique utilization rules. Custom lists can lower premiums but raise copays for some drugs.

You should review drug tiers, step therapy, and prior authorization on a plan’s formulary to avoid surprises.

Formulary Tiers and Drug Coverage

Formularies decide which drugs your plan covers, how much you pay, and any rules for getting them. Knowing tier levels, specialty drug rules, and generic vs. brand choices helps you pick the best plan for your prescriptions.

Generic vs. Brand-Name Coverage

Generics usually cost you less and work the same as brand-name drugs because they contain the same active ingredients. Medicare formularies commonly place generics in the lowest tiers with the smallest copays or coinsurance, so choosing generics can cut your out-of-pocket costs.

Some brand-name drugs appear on formularies at higher tiers or with prior authorization requirements. If your doctor thinks a brand-name medicine is necessary, you can request an exception or step therapy review from your plan.

Keep a list of your current prescriptions and check each plan’s formulary before you enroll.

The Modern Medicare Agency helps you compare how plans list your drugs. Our licensed agents review formularies with you one-on-one and show where generics or preferred brands fall on each drug list.

Specialty Medications

Specialty medications treat complex or rare conditions and often cost much more than regular drugs. Plans usually place them in a separate “specialty” tier, which means higher cost-sharing and stricter rules like prior authorization or quantity limits.

You may need to use a specific specialty pharmacy or get approval before the plan will pay. Ask your plan about coverage caps, step therapy, and whether a manufacturer assistance program can reduce costs.

Track annual out-of-pocket limits for specialty drugs since these can quickly exhaust your benefits. The Modern Medicare Agency’s agents know which plans offer better specialty drug support.

They walk you through specialty tier rules and help find plans that limit your expenses while keeping access to necessary medicines.

Tier Structures and Costs

Most Medicare plans use a tiered formulary, commonly with 5 or 6 tiers. Typical tiers look like this:

Tier 1: Preferred generics — lowest cost
Tier 2: Non-preferred generics or preferred brands — low to moderate cost
Tier 3: Preferred brand-name drugs — moderate cost
Tier 4: Non-preferred brands — higher cost
Tier 5: Specialty drugs — highest cost

Plans may use different names or add tiers for biosimilars or specialty generics. Copays and coinsurance increase as you move up tiers.

Also watch for rules like prior authorization, step therapy, and quantity limits that affect access and cost. You can save money by comparing formularies and total expected yearly costs, not just monthly premiums.

Formulary Updates and Changes

Medicare formularies change to control costs, add safer or generic options, and meet regulatory rules. You need to watch annual reviews, midyear adjustments, and how plans must tell you about changes.

Annual Review Process

Each plan updates its formulary every year, usually effective January 1. During the annual review, the plan’s medical committee of doctors and pharmacists looks at clinical evidence, new drugs approved by FDA, and cost trends.

They decide which drugs to add, remove, or move between tiers. You should get an updated formulary and a summary of benefits before open enrollment so you can compare plans and estimate your costs for the coming year.

Pay close attention to tier changes and step therapy additions. A drug moved to a higher tier can raise your copay or coinsurance.

If a drug is removed, the plan often lists alternative drugs and instructions for prior authorization or exceptions if you need to stay on the current medicine.

Midyear Changes

Plans may change formularies midyear only for specific reasons: safety risks, new clinical data, or if a manufacturer stops supplying a drug. They must follow Medicare rules and show why the change matters clinically or practically.

If your drug is affected, the plan must offer a temporary supply while you transition or allow exceptions if your prescriber documents medical need. You should regularly check the plan’s online formulary updates, especially if you rely on specialty or brand-name meds.

Make a plan with your prescriber ahead of time: ask about alternatives, how prior authorization works, and how long a transition supply will last.

Notification Requirements

Medicare plans must notify you in writing before most formulary changes take effect. You should receive specific notices for removals, tier increases, or new restrictions.

Notices must explain the reason, the effective date, and your options, such as requesting an exception, appealing, or switching drugs. If you need help interpreting a notice, contact The Modern Medicare Agency.

Our licensed agents are real people you can speak to 1 on 1. They will review your current prescriptions, explain the notice in plain language, and identify Medicare packages that match your needs without extra fees that break the bank.

Use our help to avoid surprises and keep your treatments covered.

How to Use a Medicare Formulary

A formulary tells you which drugs a plan covers, what tier they’re in, and any rules like prior authorization or step therapy. You’ll learn how to check if your medicine is covered, find lower-cost options, and get help from plan representatives or The Modern Medicare Agency.

Checking Covered Medications

Look up your plan’s formulary by plan name and year on the plan website or your member portal. Search for each drug by its generic and brand name to confirm coverage and see the drug tier.

Tiers affect your cost: lower tiers usually mean lower copays. Note any restrictions listed next to a drug: prior authorization, quantity limits, or step therapy.

If a drug says “PA” or “QL,” that means extra approval or limits are required before the plan pays. Keep a copy or screenshot of the formulary page for your records.

Check if the formulary separates coverage between Part B and Part D for drugs like injectable treatments. Also verify the pharmacy network—some drugs cost less at certain pharmacies or through mail-order.

If you’re switching plans, compare formularies before you enroll.

Finding Alternatives

If your drug isn’t covered or is too costly, look for covered alternatives. Search the formulary for the generic version first; generics usually cost much less and are often in lower tiers.

The formulary may list therapeutic alternatives in the same class. Ask your prescriber to consider a formulary-preferred alternative or to submit a justification for a non-covered drug.

You can also compare costs for the same drug at retail, in-network specialty, and mail pharmacies. Use the plan’s cost estimator tool when available.

If step therapy applies, your prescriber may need to try an approved drug before the plan will cover your preferred medicine. Keep documentation of medical need and past treatments to support exceptions or appeals.

Contacting Plan Providers

Call your plan’s customer service for quick answers about coverage rules, prior authorization steps, and pharmacy options. Have your member ID, drug names (generic and brand), and current prescriptions ready when you call.

Note the representative’s name and the date of the call. If the plan denies coverage, request a formulary exception or file an appeal.

Your prescriber can submit supporting medical records and a letter of medical necessity. Track deadlines: plans set timeframes for standard and expedited decisions.

You can also contact The Modern Medicare Agency for one-on-one help. Our licensed agents explain formularies in plain language, compare plan drug lists for you, and help submit paperwork without extra fees.

Call or schedule a free consult to have an agent review your medications and find plans that match your needs.

Exclusions and Limitations

Medicare formularies list which drugs a plan covers, but many drugs face limits or exclusions that affect your access, costs, and how you get refills. Know which medicines may be left off the list, which drugs have dose or supply caps, and when your prescriber must justify coverage.

Drugs Not Covered

Some drugs never qualify for Part D coverage. These often include medications for cosmetic use, appetite suppression, or experimental therapies.

Also, drugs covered under Part A or Part B—like certain inpatient drugs or infusion drugs billed to medical benefits—won’t appear on a Part D formulary. Plans can exclude specific brand-name drugs when a generic or therapeutic alternative exists.

If your drug is excluded, you can ask your prescriber to request an exception from the plan. The Modern Medicare Agency can help you check formularies and submit exception requests so you don’t pay out-of-pocket for an uncovered medication unnecessarily.

Quantity Limits

Plans may impose quantity limits that cap the amount you can fill at once or over a set period. Limits aim to prevent misuse and control costs, but they can affect chronic therapy and dosing schedules.

Common quantity limits include monthly pill counts, day-supply caps for controlled substances, or reduced units per prescription for specialty drugs. If your usual dose exceeds the limit, your prescriber must request an override or supply a medical justification.

The Modern Medicare Agency’s licensed agents will review your plan’s quantity rules and help arrange prior authorization or appeals when limits threaten your treatment continuity.

Prior Authorization Requirements

Prior authorization requires your prescriber to get approval before the plan covers a drug. Plans use this to ensure clinical appropriateness, step through preferred therapies, or confirm safety for high-risk medicines.

You’ll usually need to provide medical records, prior treatment history, and a provider statement explaining why alternatives won’t work. Decisions must follow specific timelines set by Medicare; if denied, you can appeal.

The Modern Medicare Agency connects you directly with licensed agents who guide the paperwork, fast-track provider statements, and explain appeal options so you can keep your therapy on schedule.

Appeals and Exceptions Process

You can ask your plan to cover a drug not on the formulary or to lower your cost for a drug that has higher cost-sharing. You can also appeal a denial or a prior authorization decision if the plan won’t approve a drug you need.

Requesting an Exception

You or your prescriber can request a formulary exception when your plan won’t cover a drug you need. State why the formulary drug is not appropriate, using medical reasons and past treatment history.

Include clinical notes, test results, and the prescriber’s statement that alternatives failed or would harm you. You may request a tiering exception to pay the lower cost for a drug placed in a higher cost tier.

Ask for a tiering exception if a cheaper alternative causes side effects or is ineffective. Plans must respond within set timeframes; ask your plan about expedited review if waiting would risk your health.

If you want help with forms or documentation, contact The Modern Medicare Agency. Our licensed agents are real people you can speak to 1 on 1, and they will help gather the needed records and submit the request without added fees.

Appeal Steps

Start appeals with your plan’s redetermination (Level 1). Follow the plan’s appeal form or call customer service to file.

Provide the same medical evidence you used for the exception request and any new information that supports why you need the drug. If the plan denies the redetermination, you can request a reconsideration by an independent review entity (Level 2).

Keep copies of all notices, dates, and the names of people you speak with. If needed, you can escalate to an administrative law judge and then to federal court, following federal deadlines and rules.

Get help from The Modern Medicare Agency at any step. Our agents explain deadlines, prepare documents, and represent your needs so you meet appeal timelines and increase your chance of approval.

Factors Affecting Formulary Inclusion

Formularies balance drug benefit, patient needs, and program rules. Clinical data, price and rebates, and Medicare rules shape whether a drug appears and where it sits on a plan’s tiered list.

Clinical Effectiveness

Plans look for clear evidence that a drug treats the target condition better than alternatives. You should expect review of randomized trials, real-world outcomes, safety profiles, and guideline endorsements.

If a drug shows better symptom control, fewer hospitalizations, or a safer side‑effect profile, plans are more likely to include it on a preferred tier. Clinical committees often compare drugs in the same class for unique benefits, dosing convenience, or interactions that matter to older adults.

They also consider whether a drug fills an unmet need when existing options fail or are not tolerated. Your individual medical needs can affect coverage if a plan allows exceptions or step therapy waivers.

Cost Considerations

Plans weigh both list price and net cost after rebates. A lower net cost helps a drug land on a lower cost-sharing tier, which reduces your out‑of‑pocket spending.

Insurers also consider volume forecasts: a drug used by many enrollees may receive different placement than a niche product. Formulary managers use tools like tiering, prior authorization, and step therapy to control spending while preserving access.

You can save money when a drug is on a preferred tier or when a generic is favored. Ask about coinsurance vs. copays—coinsurance can raise your costs for high‑price medicines even when a drug is technically covered.

Medicare Regulations

Medicare rules require Part D formularies to include drugs that treat all disease states and to offer at least two medications per category or class when applicable. Plans must follow CMS guidance on protected classes, meaning some categories (like antidepressants or antipsychotics) have stronger access protections.

These rules limit how plans can exclude entire drug classes or impose barriers. CMS also reviews formularies for transparency and consistency with benefit design.

You have the right to appeal coverage denials and request exceptions. The Modern Medicare Agency helps you understand these rules, explains specific plan formularies, and connects you with licensed agents you can speak to one‑on‑one.

Our agents match plans to your needs and aim to avoid extra fees that make coverage costly.

Comparing Medicare Formularies

You will learn how to check which drugs a plan covers and where to go for clear, reliable tools. Focus on formulary tiers, prior authorizations, and how our agents at The Modern Medicare Agency help you compare costs and coverage.

Evaluating Plan Options

Look at the plan’s formulary to see if your drugs appear and which tier each drug is in. Tiers usually affect cost: generics often sit in lower tiers, and brand-name or specialty drugs sit higher.

Check whether the plan requires prior authorization, step therapy, or quantity limits for any of your medicines. Compare total yearly cost, not just monthly premiums.

Add expected copays or coinsurance, deductible amounts, and any coverage gap details. If you use multiple pharmacies, confirm if the plan has preferred or network pharmacies that lower your cost.

The Modern Medicare Agency helps by matching your exact drug list to plan formularies. Our licensed agents talk with you 1 on 1, explain restrictions, and flag plans that raise out-of-pocket costs.

Tools and Resources

Use the Medicare Plan Finder and each plan’s online formulary PDF to search by drug name, strength, and frequency. These tools show tier placement, prior authorization rules, and step therapy at a glance.

Call the plan or your pharmacy to confirm real-time pricing. Pharmacy benefit managers can change tiers mid-year, so recheck before each enrollment period.

Keep a written list of drug names, doses, and how often you take them for quick comparisons. The Modern Medicare Agency offers free, personalized plan comparisons and walks you through online tools.

Our agents will verify coverage details with plans and pharmacies so you avoid surprise costs.

Tips for Managing Prescription Costs

Review your plan’s formulary before you fill a prescription. Check which tier your drug is on, and ask your doctor if a generic or a lower-tier alternative will work for you.

Switching can cut costs without changing your treatment. Use mail-order pharmacies for long-term meds when it makes sense.

They often offer 90-day supplies and lower copays, which saves time and money. Compare prices before you commit.

Ask about prior authorization or step therapy only if needed. These rules can affect access and timing, so know why your plan requires them.

Your provider and a licensed agent can help navigate paperwork. Look into discount programs and assistance if a drug isn’t covered.

Some programs reduce out-of-pocket costs during coverage gaps. Always verify eligibility before relying on them.

Keep a drug list and bring it to every healthcare visit. Include doses, strengths, and how often you take each medicine.

This helps avoid costly duplicates and keeps your care coordinated. Work with The Modern Medicare Agency for personalized plan selection.

Our licensed agents are real people you can speak to 1-on-1. They identify Medicare packages that fit your needs without hidden fees.

Talk to an agent before enrollment or during yearly plan reviews. Small changes in formularies or tiers happen each year.

A short call can prevent surprise costs and keep your medications affordable.

Conclusion

Choosing the right Medicare formulary affects your access to medicines and your out-of-pocket costs.

You should review plan drug lists each year and compare coverage for drugs you use now and might need later.

The Modern Medicare Agency helps you find plans that match your needs and budget.

Our licensed agents talk with you one on one to explain formularies, coverage rules, and any cost-sharing details.

You keep control: tell us your medications, preferred pharmacies, and budget.

We run comparisons and point out restrictions, step therapy, or prior authorization rules that could matter to you.

Working with The Modern Medicare Agency costs you nothing extra for personalized help.

You get clear options and practical advice so you can pick a plan that fits your health needs and finances.

What Is Medicare Part B and What Does It Actually Cover?

The complete guide to Medicare’s medical insurance — every service it covers, exactly what it costs in 2026, how it works with group insurance and VA benefits, and the excess charges most people have never heard of until they get a surprise bill.

The Short Answer

Medicare Part B is medical insurance — it covers doctor visits, outpatient care, preventive services, durable medical equipment, and more. Unlike Part A, Part B is not premium-free for anyone: everyone pays a monthly premium (202.90in2026formostpeople),anannualdeductible(283), and 20% coinsurance on most covered services, with no yearly cap on that 20% under Original Medicare alone. Whether you need to enroll at 65, and whether delaying is safe, depends heavily on your employment status and your employer’s size — getting this wrong is one of the most consequential and permanent mistakes in all of Medicare.

Key Takeaways

Part B is never premium-free — everyone pays a monthly premium, and higher earners pay significantly more through IRMAA.
The 20% coinsurance under Original Medicare alone has no yearly cap — this is the single biggest financial risk in Medicare, and it’s the reason Medigap and Medicare Advantage exist.
Whether you can safely delay Part B without a penalty depends on your employer’s size: 20+ employees generally allows delay; fewer than 20 generally does not.
Missing your enrollment window triggers a permanent 10% penalty for every 12-month period you went without coverage.
Veterans can and generally should enroll in Part B even with VA benefits, since Medicare and VA coverage don’t coordinate — each only pays for care received within its own system.
“Excess charges” from non-participating providers can add up to 15% on top of what Medicare approves, and only some Medigap plans protect you from them.

What Part B Actually Covers

While Part A handles hospital room and board, Part B is the half of Original Medicare that covers medical care and most services delivered outside a hospital admission — doctor visits, outpatient procedures, and ongoing medical needs.

What’s covered

Doctor visits — primary care and specialists
Outpatient surgeries and procedures
Diagnostic lab work, X-rays, and MRIs
Emergency room visits
Ambulance services
Outpatient mental health care
Physical, occupational, and speech therapy
Chemotherapy and radiation received in an outpatient clinic
Durable Medical Equipment (DME) — wheelchairs, oxygen equipment, blood sugar monitors, walkers, and similar equipment
Ambulatory surgical center services

Preventive services: the part Medicare gets genuinely right

Most preventive services are covered at 100%, with no deductible and no copay, as long as your provider accepts Medicare assignment. This includes:

Your one-time “Welcome to Medicare” wellness visit, available within your first 12 months on Part B
Annual wellness visits after that
Flu shots and most other recommended vaccines
Mammograms
Colonoscopies and other cancer screenings
Diabetes and cardiovascular screenings
Many other screenings recommended by the U.S. Preventive Services Task Force

Paul’s Honest Take: This is one of the most underused parts of Medicare, full stop. I’ve had clients who paid for a private physical every year out of habit and never realized their annual wellness visit through Medicare was completely free. If you haven’t used your Welcome to Medicare visit or your annual wellness visit, that’s real value sitting on the table.

What’s NOT covered

Routine dental care — cleanings, fillings, dentures, extractions
Routine vision exams and eyeglasses
Hearing aids (though diagnostic hearing tests ordered by a doctor may be covered)
Long-term custodial nursing home care — help with daily living activities, as opposed to short-term skilled or medical care
Routine prescription drugs you pick up at a retail pharmacy — that’s Part D’s job, not Part B’s
Cosmetic surgery, unless medically necessary (such as reconstruction after an accident or mastectomy)
Most care received outside the United States, with very limited exceptions
Routine foot care, such as nail trimming, in the absence of a qualifying medical condition
Acupuncture, except for a narrow, specific chronic low back pain benefit
Concierge medicine fees and membership-style charges some practices add on top of standard care
Long-term care insurance-style services, including most home-based personal care that isn’t tied to a skilled medical need

Paul’s Honest Take: The dental and vision exclusions are the ones that surprise people most, especially since they’re such routine parts of healthcare for most adults. This is exactly why so many Medicare Advantage plans build dental, vision, and hearing benefits into their coverage — Original Medicare was simply never designed to include them, and that gap doesn’t go away on its own.

What Part B Costs in 2026

Part B has three separate cost components, and understanding all three matters:

Cost Component	2026 Amount
Standard monthly premium	$202.90
Annual deductible	$283
Coinsurance on most covered services	20%

The premium is deducted automatically from your Social Security check if you’re already collecting benefits. If you’re not yet collecting Social Security, you’ll receive a bill, typically every three months.

The deductible works differently than Part A’s — it’s a straightforward annual figure. You pay the first $283 of Medicare-approved outpatient costs each calendar year, and then Medicare’s cost-sharing kicks in.

The coinsurance is where the real risk lives. After your deductible is met, Medicare pays 80% of the Medicare-approved amount for most covered services, and you’re responsible for the remaining 20%. There is no yearly cap on this 20% under Original Medicare alone. If you have a $100,000 course of cancer treatment, your 20% share is $20,000 — unless you have a Medigap policy or Medicare Advantage plan absorbing that cost.

Paul’s Honest Take: I put this in bold because it’s genuinely the single most important number in this entire guide. That uncapped 20% is the whole reason Medigap and Medicare Advantage exist as products in the first place. Original Medicare by itself was never designed to protect you from a truly expensive year — it was designed to cover 80% of it and leave the rest to you.

IRMAA: What Higher Earners Actually Pay

If your income is above certain thresholds, you’ll pay more for Part B through the Income-Related Monthly Adjustment Amount (IRMAA) — based on your tax return from two years prior. For 2026, that means your 2024 income determines your premium tier.

2024 Income (Individual)	2024 Income (Married, Joint)	Total Part B / Month
$109,000 or less	$218,000 or less	$202.90
$109,001 – $137,000	$218,001 – $274,000	$284.10
$137,001 – $171,000	$274,001 – $342,000	$405.80
$171,001 – $205,000	$342,001 – $410,000	$527.50
$205,001 – $499,999	$410,001 – $749,999	$649.20
$500,000 and above	$750,000 and above	$689.90

At the top tier, you’re paying more than three times the standard premium. If your income has recently dropped — retirement, the loss of a spouse, or certain other life-changing events — you can appeal your IRMAA determination using Form SSA-44.

Do You Have to Enroll? And What Happens If You Don’t?

Technically, Part B is optional — Medicare won’t force you into it. But opting out without a valid alternative is genuinely risky, because of how the penalty structure works.

If you don’t sign up during your Initial Enrollment Period (the 7-month window around your 65th birthday) and you don’t have qualifying employer coverage, you’ll face a permanent 10% penalty added to your premium for every full 12-month period you went without Part B. That penalty doesn’t expire — you pay it for as long as you have Part B, which for most people means for the rest of your life.

Example: If you delayed enrollment by 24 full months without a valid exception, you’d pay an extra 20% on top of the standard $202.90 premium in 2026 — roughly $40.58 more, every month, permanently.

How Part B Works with Group Insurance

Just like Part A, whether you can safely delay Part B without penalty comes down to one specific number: how many employees your company has.

Companies with 20 or more employees: If you or your spouse are actively working and covered by a genuine group health plan, your workplace insurance is primary, and you can legally delay Part B without any penalty. When that employment or coverage eventually ends, you get an 8-month Special Enrollment Period to enroll in Part B penalty-free.

Companies with fewer than 20 employees: Medicare automatically becomes your primary insurer at 65, regardless of your employment status. You need to enroll in Part B right on schedule. If you don’t, your small employer’s plan can legally refuse to pay claims that Medicare should have covered first — potentially leaving you responsible for the full cost.

Paul’s Honest Take: I say this in nearly every guide I write, because it’s genuinely one of the costliest misunderstandings I encounter: “I have good coverage at work” and “I’m protected from Medicare’s enrollment deadlines” are two completely different statements, and whether the second one is true depends entirely on your employer’s size — not how generous the coverage feels. Confirm the actual employee count before you decide to delay anything.

Retiree Coverage Is Not the Same as Active Employer Coverage

This is a distinction that catches a genuinely large number of people off guard: the “20 or more employees” exception only applies to active employment. If you retire and your former employer offers you retiree health benefits — sometimes a genuinely good, comprehensive plan — that coverage does not create a Special Enrollment Period the way active group coverage does, and it does not exempt you from enrolling in Part B on time.

Paul’s Honest Take: I’ve seen this mistake more than once, and it’s an especially painful one because it happens to people who did everything right during their working years. Someone retires with a strong retiree health plan from a large employer, assumes it works the same way their active coverage did, and delays Part B — only to find out later that retiree coverage was never a valid reason to delay in the first place. The moment you stop actively working, that clock starts, regardless of how good your retiree plan looks on paper. If you’re retiring and keeping employer retiree benefits, treat enrolling in Part B as something to handle right on schedule, not something retiree coverage lets you postpone.

Why You Need Both Part A and Part B for Medigap or Medicare Advantage

Here’s a foundational requirement worth understanding clearly, since it shapes every other coverage decision in Medicare: you must be enrolled in both Part A and Part B before you can buy a Medigap policy or enroll in a Medicare Advantage plan. Neither product exists as a standalone substitute for Original Medicare — both are built specifically to work alongside it.

Medigap fills the cost-sharing gaps left by Original Medicare (Parts A and B) — it has nothing to fill in if you’re not enrolled in both parts to begin with.
Medicare Advantage legally must provide at least the same coverage as Parts A and B combined, which is only possible because you’re required to be enrolled in both before a Medicare Advantage carrier can enroll you.

Paul’s Honest Take: This surprises people who assume they can somehow “skip” Part B and go straight into a Medicare Advantage plan to avoid the extra premium. It doesn’t work that way — Part B enrollment, and its premium, is a prerequisite either way, whether you end up on Original Medicare with Medigap or on a Medicare Advantage plan. There’s no path through Medicare that avoids the Part B premium once you’re actually using the system.

Does Medicare Work If You’re a Veteran?

Yes — and if you have VA health benefits, understanding how the two systems relate is genuinely important, because they work differently than most people assume.

Medicare and VA benefits do not coordinate. These are two entirely separate systems that each pay only for care received within their own network. Medicare doesn’t pay for care you receive at a VA facility, and VA benefits don’t pay for care you receive from a non-VA doctor or hospital. You, the veteran, choose which system to use each time you seek care.

Here’s the critical point: having VA benefits does not exempt you from Medicare’s enrollment deadlines. VA coverage is not considered a qualifying reason to delay Part B without penalty. If you don’t enroll in Part B during your Initial Enrollment Period and you’re relying solely on VA benefits, you can still trigger the permanent late enrollment penalty.

Why the VA itself recommends enrolling in Medicare anyway:

It gives you access to civilian doctors and hospitals outside the VA system
VA healthcare funding depends on annual Congressional appropriations, which isn’t guaranteed to remain stable
If VA authorizes only part of your needed care at a non-VA facility, Medicare can help cover the rest
Having both gives you meaningfully more flexibility and security than relying on either system alone

Paul’s Honest Take: This is one of the most common misconceptions I run into with veterans specifically, and it’s an expensive one to get wrong. Good VA coverage feels like it should be enough, and it might genuinely handle most of your care — but it doesn’t protect you from the Part B enrollment clock the way employer coverage from a large company can. The VA itself actively encourages enrolling in Medicare Parts A and B for exactly this reason. If you have VA benefits and are approaching 65, this is worth a direct conversation before you assume you’re covered.

Veterans who enroll in Part B can also purchase a Medigap policy, which can be particularly valuable if you use non-VA providers regularly — though if you primarily rely on VA facilities for most of your care, the value of an added Medigap policy may be more limited, and worth weighing carefully.

How Long Does It Actually Take to Get Part B Approved?

This is one of the most practical, and most overlooked, pieces of planning — especially if you’re leaving a job after 65 and coordinating your Part B start date around the end of your employer coverage. Applying isn’t instant, and the timeline depends heavily on which enrollment window you’re using.

Enrollment Situation	Typical Processing Time	When Coverage Actually Starts
Initial Enrollment Period (around 65)	2–4 weeks, sometimes up to 6	1st of your birthday month (if applied in the 3 months before) or 1st of the month after you apply (if applied during or after your birthday month)
Special Enrollment Period (leaving employer coverage)	4–8 weeks, sometimes longer	1st of the month after your application is submitted
General Enrollment Period (Jan 1–Mar 31, missed window)	4–6 weeks	1st of the month after you apply

Why the Special Enrollment Period takes longer: applying after leaving employer coverage requires two forms, not one — Form CMS-40B (the actual Part B application) and Form CMS-L564 (Request for Employment Information), which your employer needs to complete to verify you had qualifying coverage. Social Security has to manually review both, which is exactly why this route consistently takes longer than a standard Initial Enrollment Period application.

Paul’s Honest Take: This timeline question comes up constantly with clients who are retiring or leaving a job after 65, and it deserves real attention — not just because of the penalty risk we’ve already covered, but because a slow approval can leave you with an actual gap in coverage if you time it too tightly. My standard advice: start this process at least 2 to 3 months before you need Part B to actually begin, not the week your employer coverage ends. If your former employer is slow to complete their portion of Form CMS-L564, that alone can hold up the entire application — so it’s worth following up with your HR or benefits department directly rather than assuming it’s been submitted.

Practical tips to avoid delays

Apply online through SSA.gov whenever possible. It’s consistently the fastest method — mailed or faxed forms are more prone to getting lost or delayed.
If you’re on a Special Enrollment Period, submit Form CMS-L564 alongside Form CMS-40B, not separately. They need to arrive together, and one incomplete form can stall the whole application.
Expect a short intake lag even with online applications. It can take several business days for an online submission to actually appear on a local Social Security agent’s screen — don’t panic if you call shortly after applying and they say they don’t see it yet.
Once approved, you don’t have to wait for your physical card. Your Medicare Beneficiary Identifier typically appears in your online Social Security or Medicare.gov account within a day or two of approval, and you can print a temporary card from there — the physical card generally arrives by mail within about 30 days.

Excess Charges: The Cost Almost Nobody Knows to Ask About

Here’s a detail that surprises even people who’ve been on Medicare for years: not every doctor who accepts Medicare agrees to accept Medicare’s approved amount as full payment.

Providers fall into three categories:

Participating providers accept Medicare assignment, meaning they agree to accept the Medicare-approved amount as payment in full. This covers the vast majority of providers — roughly 98% of doctors nationally.
Non-participating providers still accept Medicare patients but haven’t agreed to accept the standard rate. They can charge an excess charge of up to 15% above the Medicare-approved amount.
Opted-out providers have left the Medicare system entirely and can charge whatever they want under a private contract — Medicare pays nothing at all for care from these providers, except in emergencies.

How excess charges actually work: if the Medicare-approved amount for a service is $300 and you see a non-participating provider, they can legally charge up to an additional $45 (15%) on top, for a total bill of $345 — and that excess amount doesn’t count toward your Part B deductible.

Eight states currently prohibit or limit excess charges entirely: Connecticut, Massachusetts, Minnesota, New York, Ohio, Pennsylvania, Rhode Island, and Vermont. If you live in one of these states, you’re generally shielded from excess charges from providers within your state — though you could still face them if you receive care from a non-participating provider elsewhere.

Paul’s Honest Take: This is exactly why Medigap Plan G matters so much for people who want maximum flexibility. Plan G covers excess charges in full — Plan N does not. If you’re the kind of person who wants the freedom to see any doctor without worrying about billing surprises, that distinction is worth understanding clearly before you pick between the two. And regardless of which plan you choose, it’s always worth asking a new provider directly whether they accept Medicare assignment before your first appointment.

The HSA Rule: Part B Closes the Door Too

If you’re hoping to keep contributing to a Health Savings Account, know this clearly: enrolling in Part B — or any part of Medicare — ends your ability to make new HSA contributions. This isn’t unique to Part B; it applies the moment you enroll in Medicare in any form, including premium-free Part A.

If keeping your HSA active matters to you, the only way to legally delay both Part A and Part B is through qualifying employer coverage — which, as covered above, generally requires an employer with 20 or more employees. And because Part A enrollment can be backdated up to 6 months once you do enroll, it’s smart to stop HSA contributions 6 months before you plan to sign up for Medicare or file for Social Security, whichever comes first.

Frequently Asked Questions

Is there a cap on what I’ll pay for Part B services in a year? Not under Original Medicare alone — the 20% coinsurance has no yearly limit. A Medigap policy or Medicare Advantage plan is what actually caps your exposure.

What happens if I don’t sign up for Part B on time? You’ll generally face a permanent 10% penalty on your premium for every 12-month period you went without coverage, unless you qualify for a Special Enrollment Period through active employer coverage.

Do I need Part B if I have good coverage through a small employer? Almost certainly yes. If your employer has fewer than 20 employees, Medicare becomes your primary insurer at 65 regardless of your job coverage, and not enrolling can leave you exposed to unpaid claims and a lifelong penalty.

Do veterans need Medicare Part B if they have VA benefits? Generally, yes. Medicare and VA benefits don’t coordinate — each only pays for care within its own system — and VA coverage doesn’t exempt you from Medicare’s enrollment deadlines or penalties.

What is a Part B excess charge? An additional charge, up to 15% above the Medicare-approved amount, that a non-participating provider can legally bill you. It doesn’t count toward your deductible, and only Medigap Plan G (among current plans) covers it in full.

Can I keep contributing to my HSA if I enroll in Part B? No. Enrolling in any part of Medicare, including Part B, ends your HSA contribution eligibility going forward.

How long does it take to get approved for Part B? It depends on the enrollment window. Initial Enrollment Period applications typically process in 2–4 weeks. Special Enrollment Period applications, used when leaving employer coverage, generally take 4–8 weeks since Social Security must manually verify your prior coverage using Form CMS-L564. Start the process at least 2–3 months before you need coverage to begin, especially when coordinating around a job ending.

The Bottom Line

Part B is the half of Medicare that covers your everyday medical care — and it’s also where the real financial exposure of Original Medicare lives, thanks to that uncapped 20% coinsurance. Whether you should enroll at 65, whether you can safely delay, and how much of that exposure you’re carrying all depend on details specific to your situation: your employer’s size, your income, your VA status, and which doctors you actually see.

If you want help sorting out exactly how Part B applies to your specific circumstances — or want to understand how Medigap or Medicare Advantage could close that uncapped coinsurance gap — that’s exactly the conversation I have with clients every day, at no cost to you.

Call 631-358-5793 or visit paulbinsurance.com to set up a time to talk it through.

Paul Barrett, CMIP, is the founder of The Modern Medicare Agency, based in Melville, NY, and has spent 18+ years exclusively helping people navigate Medicare — never life insurance, never annuities, just Medicare. He’s licensed in 37 states, represents more than 40 carriers, and has personally helped over 5,000 clients choose coverage that actually fits their lives.

Figures current as of 2026 and sourced from CMS, Medicare.gov, and the Social Security Administration. Individual circumstances vary, especially around employer coverage, VA benefits, and income-based premiums — always verify your specific situation before making enrollment decisions.