Senior man reviewing Medicare paperwork at kitchen table

How to Drop Medicare Advantage Back to Original Medicare

Yes, you can leave your Medicare Advantage plan and return to Original Medicare. The two routine windows are the Annual Election Period (AEP: October 15–December 7) and the Medicare Advantage Open Enrollment Period (MA OEP: January 1–March 31). Your first move is simple: call 1-800-MEDICARE (1-800-633-4227) or log in to Medicare.gov to initiate the change. There is no CMS disenrollment penalty for switching back, but two consequential risks follow you if you miss the timing: a permanent Part D late-enrollment penalty and potential loss of guaranteed-issue Medigap rights.

  • Annual Election Period (AEP): runs from mid-October to early December each year. Coverage starts January 1.
  • MA Open Enrollment Period (MA OEP): runs from early January through March. Coverage starts the first day of the month after your request is received.
  • Special Enrollment Periods (SEPs): Triggered by qualifying life events such as moving outside your plan’s service area or your plan leaving the area.
  • Part D timing: If your MA plan included drug coverage, enroll in a stand-alone Part D plan within a limited window after losing that coverage to avoid a permanent penalty.
  • Medigap: Verify your guaranteed-issue rights before you disenroll. Losing that window can make Medigap unaffordable or unavailable.

Table of Contents

When you can switch back: AEP, MA OEP, and effective dates

The two primary enrollment windows work differently, and picking the wrong one can delay your coverage by months.

Annual Election Period runs each fall. Anyone on Medicare can use it, and any change you make takes effect January 1. This is the most flexible window because it is not limited to current MA enrollees.

Medicare Advantage Open Enrollment Period runs early each year. It is available only to people already enrolled in a Medicare Advantage plan, and you get only one coverage change during the window. Submit your request early in the period, and your Original Medicare coverage starts the first day of the following month after your request is received. The clock starts the day your plan or CMS receives the request, not the day you mail it.

Special Enrollment Periods exist for qualifying life events. Moving outside your plan’s service area is the most common trigger. If you move and do not join a new MA plan during that SEP, Medicare automatically enrolls you in Original Medicare once your old plan drops you. Some SEPs also carry guaranteed-issue Medigap rights, which matters enormously for your supplemental coverage options.

Enrollment Window Dates Who Can Use It Coverage Effective Date
Annual Election Period (AEP) Fall months each year All Medicare beneficiaries Typically January 1
MA Open Enrollment Period (MA OEP) Early year months Current MA enrollees only; one change Beginning of month after request received
Special Enrollment Period (SEP) Varies by qualifying event Those with a qualifying life event Varies by SEP type

Infographic comparing Medicare enrollment windows

Pro Tip: If you are in the MA OEP and unsure whether to switch, confirm your provider network, drug formulary, and any prior authorization transfers before you finalize. You only get one change during this window, and a mistake may force you to wait until the next AEP.

Step-by-step: how to drop Medicare Advantage and return to Original Medicare

Switching is straightforward when you follow the steps in order. Skipping step two is where most people run into trouble.

  1. Verify your enrollment window and effective date. Confirm you are in AEP, MA OEP, or a qualifying SEP. Write down the exact effective date your Original Medicare coverage will start so you know when to expect the change.

  2. Handle drug coverage before you disenroll. If your MA plan included prescription drug coverage, select a stand-alone Part D plan and enroll in it simultaneously. You can compare plans at Medicare.gov’s Plan Finder. Do not wait until after your MA plan ends. Enrolling in a Part D plan will often automatically trigger disenrollment from your MA plan.

  3. Submit the change through one of three routes. You can enroll in a new plan or drop your MA plan by logging in to Medicare.gov, calling 1-800-MEDICARE (1-800-633-4227), or contacting your plan directly. You do not need a special cancellation form — enrolling in a stand-alone Part D plan typically triggers automatic disenrollment from your MA plan. If you are returning to Original Medicare without Part D, call your plan or 1-800-MEDICARE directly. Record your confirmation number and the date of every call.

  4. Confirm your coverage on mymedicare.gov. After your effective date, log in to mymedicare.gov and verify that Part A and Part B show as active. If you enrolled in Part D, confirm it appears there too. Do not assume the change processed correctly until you see it in writing.

  5. Escalate if something looks wrong. If your records still show the MA plan after the effective date, call 1-800-MEDICARE immediately and reference your confirmation number. Ask for a case number and document the name of the representative you spoke with. Keep copies of any written correspondence, disenrollment notices, or enrollment confirmations.

Pro Tip: Call your primary care doctor and any specialists after the effective date to confirm they have your updated coverage on file. Providers sometimes bill the wrong plan for weeks after a switch if their records are not updated.

Woman calling doctor’s office about Medicare switch

What happens to your drug coverage and prior authorizations when you switch

The 63-day window is the most consequential deadline in this entire process. If your MA plan included Part D drug coverage and you return to Original Medicare without immediately enrolling in a stand-alone Part D plan, you have 63 days from the date you lose drug coverage to enroll in a new plan before a permanent late-enrollment penalty kicks in. That penalty is calculated as a percentage of the national base beneficiary premium and is added to your Part D premium for as long as you have drug coverage. It does not go away.

The 63-day rule: Once your Medicare Advantage drug coverage ends, you have 63 days to enroll in a stand-alone Part D plan. Miss that window and you pay a permanent penalty on top of your monthly Part D premium — every month, for the rest of your coverage.

Prior authorizations are a separate issue. Your MA plan may have pre-approved certain medications, procedures, or specialist visits. When you return to Original Medicare, those authorizations do not transfer. Original Medicare does not use prior authorization for most services the way MA plans do, so in many cases this actually simplifies access. However, if you are mid-treatment with a specialty drug that required PA under your MA plan, confirm with your prescriber that the drug is covered under Original Medicare Part B or your new Part D formulary before the switch takes effect.

Pharmacy access also shifts. MA plans typically use a network of preferred pharmacies. Original Medicare combined with a stand-alone Part D plan has its own pharmacy network, which may differ. Check that your regular pharmacy is in-network under the new Part D plan before you finalize enrollment.

Costs and financial consequences of returning to Original Medicare

The financial picture changes significantly when you leave a Medicare Advantage plan. MA plans are legally required to cap your annual out-of-pocket costs. Original Medicare has no such cap. That single difference is the most important number in this decision.

Couple reviewing Medicare financial documents together

Under Original Medicare, Part B generally covers most of approved outpatient costs, but beneficiaries pay a portion of the costs with no annual ceiling. For a routine year, that may be manageable. For someone with a serious illness, a surgery, or ongoing specialist care, uncapped 20% coinsurance can accumulate fast. Original Medicare also does not cover routine dental, vision, or hearing — services many MA plans include.

Key cost dimensions to compare:

  • Monthly premiums: Most MA plans charge a low or $0 premium beyond the standard Part B premium. Original Medicare alone has no additional premium, but a Medigap policy adds a monthly cost that varies by plan, age, and state.
  • Out-of-pocket maximum: MA plans have a legally required annual cap. Original Medicare has none.
  • Part B coinsurance: 20% of approved costs with no annual ceiling under Original Medicare.
  • Part A deductible: Applies per benefit period under Original Medicare, not per year.
  • Medigap: Adds a monthly premium but eliminates or sharply limits your out-of-pocket exposure.
Cost Factor Medicare Advantage Original Medicare (no Medigap) Original Medicare + Medigap
Annual out-of-pocket cap Yes (legally required) None Varies by plan (Plan G covers most gaps)
Part B coinsurance Varies by plan 20% (no ceiling) Covered by Medigap
Routine dental/vision/hearing Often included Not covered Not covered
Monthly premium (beyond Part B) Often $0–low $0 Added Medigap premium
Provider network Restricted network Any Medicare-accepting provider Any Medicare-accepting provider

Warning: Returning to Original Medicare without a Medigap policy exposes you to unlimited out-of-pocket costs. A single hospitalization or cancer diagnosis can generate tens of thousands of dollars in 20% coinsurance with no annual ceiling to stop it.

Medigap guaranteed-issue rights, timing, and the Medigap trap

Medigap is where the most consequential and least-understood risk lives. In most states, Medigap insurers can apply medical underwriting outside guaranteed-issue windows, meaning they can deny your application or charge significantly higher premiums based on your health history. The Medigap trap is simple: if you miss your guaranteed-issue window, you may find Medigap unaffordable or unavailable entirely.

Two guaranteed-issue windows are most relevant here. First, if you are in your first 12 months of a Medicare Advantage plan and decide to return to Original Medicare, you have a guaranteed right to buy a Medigap policy for a limited time after disenrolling. Second, certain SEPs, such as your plan leaving your service area, also trigger guaranteed-issue rights. Outside these windows, most states leave the decision entirely to the insurer.

A handful of states offer broader protections. Connecticut, Maine, Massachusetts, Missouri, New York, and Washington have state-level rules that extend guaranteed-issue rights beyond the federal minimums. If you live in one of these states, your options are materially better. If you do not, the window is narrow and the stakes are high.

The Medigap trap in plain terms: Once your guaranteed-issue window closes, an insurer can look at your medical history and either deny your application or price the policy out of reach. For someone with diabetes, heart disease, or a prior cancer diagnosis, this can mean no affordable path to supplemental coverage — ever.

Action steps before you disenroll:

  • Confirm whether you are still within your first 12 months on an MA plan.
  • Check your state’s Medigap rules at Medicare.gov or by calling your State Health Insurance Assistance Program (SHIP).
  • If you have a guaranteed-issue right, apply for Medigap before or simultaneously with disenrolling from MA, not after.

Pro Tip: Lock in your Medigap policy before you finalize the MA disenrollment if at all possible. Applying after the fact, even by a few days, can put you outside the guaranteed window in states without extended protections.

Pre-switch checklist: what to confirm before and after you switch

Use this checklist the week you plan to initiate the switch and again after your effective date.

Before you switch:

  1. Confirm you are in AEP, MA OEP, or a qualifying SEP and note your exact effective date.
  2. Check whether you are within your first 12 months on the MA plan (guaranteed-issue Medigap window).
  3. Contact your State Health Insurance Assistance Program (SHIP) to verify state-specific Medigap protections.
  4. Select a stand-alone Part D plan on Medicare.gov’s Plan Finder and confirm your medications are on the formulary.
  5. Apply for Medigap if you have guaranteed-issue rights — do this before or simultaneously with disenrolling.
  6. Call 1-800-MEDICARE or contact your plan to initiate the disenrollment. Record the confirmation number, date, and representative’s name.
  7. Save copies of all written correspondence, disenrollment notices, and enrollment confirmations.

After your effective date:

  1. Log in to mymedicare.gov and confirm Part A, Part B, and Part D all show as active.
  2. Call your primary care doctor and key specialists to confirm they have your updated coverage on file.
  3. Verify your regular pharmacy is in-network under your new Part D plan.
  4. Update your insurance information with any hospitals or outpatient facilities you use regularly.

Expert tips from an independent Medicare agent

The mechanics of switching are not the hard part. The hard part is the timing, and the things that go wrong almost always come down to a mismatch between when MA drug coverage ends and when Part D begins, or a Medigap application filed one week too late.

What experienced agents watch for: The most common costly mistake is a beneficiary who disenrolls from MA in December, assumes their Part D starts January 1, and discovers their new plan was not processed in time. A one-month gap in drug coverage can trigger the 63-day penalty clock. Agents confirm the Part D effective date matches the MA end date before the client finalizes anything.

A few other things agents routinely check before a client switches:

  • Provider continuity: Confirm your doctors and specialists accept Original Medicare. Most do, but some concierge or hospital-employed physicians have opted out. Check the Medicare.gov provider directory before the switch.
  • Prior authorization transfers: If you have an active PA for a specialty drug or procedure, document it in writing from your MA plan before disenrolling. It will not transfer, but having it documented helps your prescriber navigate the new coverage.
  • Medigap application timing: Agents often submit the Medigap application and the MA disenrollment request on the same day to avoid any gap in the guaranteed-issue window.
  • Confirmation documentation: Save every confirmation number, every letter, and every email. If a billing dispute arises three months later, that paper trail is what resolves it.

Paul Barrett has been working with Medicare consumers as an independent agent since 2007. At Paulbinsurance, the team helps clients verify Medigap eligibility, select and enroll in Part D plans, and confirm that every coverage change processes correctly before the effective date.

Key Takeaways

Switching from Medicare Advantage back to Original Medicare is possible during two annual windows, but the Medigap and Part D timing decisions you make before you disenroll determine whether the switch costs you more or less in the long run.

Point Details
Two routine windows AEP (Oct 15–Dec 7) and MA OEP (Jan 1–Mar 31) are the standard routes back to Original Medicare.
63-day Part D rule Enroll in a stand-alone Part D plan within 63 days of losing MA drug coverage to avoid a permanent penalty.
Medigap guaranteed-issue rights Verify your window before disenrolling — losing it can make Medigap unaffordable or unavailable.
No out-of-pocket cap Original Medicare has no annual out-of-pocket maximum; without Medigap, your financial exposure is unlimited.
Paulbinsurance guidance Paulbinsurance helps clients verify Medigap eligibility, enroll in Part D, and confirm coverage changes before the effective date.

What switching actually looks like from an agent’s perspective

Most people who call about switching from Medicare Advantage are not confused about whether they can switch. They are worried about what they might miss. The Medigap question is almost always the one that keeps them up at night, and for good reason. The mechanics of disenrollment are simple. The consequences of getting the Medigap timing wrong can follow someone for the rest of their coverage.

The most useful thing an independent agent does in this situation is not fill out forms. It is asking the right questions in the right order: Are you still in your first year on this plan? What state are you in? What medications are you on, and is your pharmacy in the new Part D network? Those answers shape everything else. When clients work through this process with the Paulbinsurance team, they leave knowing their Part D starts the same month their MA plan ends, their Medigap application is in before the guaranteed window closes, and their providers are updated.

Paulbinsurance can walk you through every step of the switch

Returning to Original Medicare is a decision that deserves more than a checklist. The coverage verification, Part D selection, and Medigap eligibility check all need to happen in the right order, and one missed step can create a gap that costs real money.

Paulbinsurance

At Paulbinsurance, the team of independent Medicare agents helps you confirm your enrollment window, check your Medigap guaranteed-issue status, compare and enroll in a stand-alone Part D plan, and verify that your coverage changes process correctly. If you need help evaluating whether Original Medicare plus a Medicare Supplement plan is the right financial fit, that conversation is part of the service too.

Paulbinsurance is an independent agency, not a government office. The team works for you, not for any single carrier.

Ready to get started? Call Paulbinsurance directly or visit paulbinsurance.com to schedule a no-cost coverage review. Bring your current plan information and your list of medications, and the team will handle the rest.

This article is general information, not professional legal or financial advice. Enrollment rules, premiums, and state Medigap protections change annually. Confirm current rules at Medicare.gov or by calling 1-800-MEDICARE (1-800-633-4227) before making any coverage change.

Authoritative sources and official resources

For final confirmation on enrollment windows, Part D rules, and Medigap guidance, go directly to the primary sources.

Official resources to bookmark:
Medicare.gov is the authoritative starting point for all enrollment period rules, plan comparison tools, and Medigap guidance. The 1-800-MEDICARE line (1-800-633-4227) connects you to live assistance and is the right number to call when initiating a disenrollment or confirming a change. Save your confirmation number from every call.

  • Medicare.gov — Enrollment windows and plan changes: medicare.gov/basics/get-started-with-medicare/get-more-coverage/joining-a-plan
  • Medicare.gov — Special Enrollment Periods: medicare.gov/basics/get-started-with-medicare/get-more-coverage/joining-a-plan/special-enrollment-periods
  • Medicare.gov — When to buy Medigap: medicare.gov/health-drug-plans/medigap/ready-to-buy/when
  • Medicare.gov — Part D drug costs: medicare.gov/basics/costs/drug/drug-costs
  • KFF (Kaiser Family Foundation): Independent policy analysis on Medicare Advantage enrollment trends and beneficiary costs — useful for context on how MA and Original Medicare compare financially.
  • State Health Insurance Assistance Programs (SHIP): Free, unbiased counseling on Medicare options in your state. Find your local SHIP at shiphelp.org.
  • Center for Medicare Advocacy: In-depth resources on the Medigap trap and beneficiary rights when switching coverage.

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.

Sources

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