Medicare provider network comparison infographic explaining the differences between HMO, PPO, and PFFS Medicare Advantage plans, including provider access, referrals, out-of-network coverage, and costs.

Medicare Networks Explained: HMO, PPO, PFFS

If you’ve started comparing Medicare Advantage plans, you’ve probably run into these letters over and over: HMO, PPO, HMO-POS, and sometimes PFFS. They’re not just fine print — they determine which doctors you’re allowed to see, whether you need a referral, and what happens to your wallet if you step outside the network. Here’s what each one actually means in practice.

The Four Types at a Glance

Infographic comparing four common Medicare provider network types and explaining how HMO, PPO, HMO-POS, and PFFS plans differ in provider access and out-of-network flexibility.

The Letters Matter Less Than Network Size

Before going deeper into what each acronym means, here’s the point that actually matters most, and it’s easy to miss: the letters tell you the rules, but they don’t tell you how many doctors you’ll actually have access to.

An HMO with a large, well-built network can genuinely serve you better than a PPO with a thin one — even though the HMO “restricts” you to its network and the PPO technically lets you go anywhere. If that HMO includes thousands of local doctors and specialists, you may never feel restricted at all in practice. Meanwhile, a PPO’s out-of-network flexibility is only as useful as your willingness to pay the higher coinsurance every time you use it — and if its in-network list is small, you could end up paying those higher out-of-network rates constantly just to see anyone convenient.

The same logic applies to HMO-POS plans. The “escape hatch” to go out-of-network sounds appealing on paper, but if the plan’s core network is tiny, that escape hatch is doing a lot of load-bearing work — and you’re relying on it, and its prior-authorization process, far more often than you’d like.

Paul’s Honest Take: This is the thing I wish more people understood before they pick a plan type and stop looking any further. Don’t ask “is this an HMO or a PPO” as your first question — ask “how many doctors near me actually participate in this specific plan.” A large network under a restrictive HMO structure will usually serve you better day-to-day than a small network under a flexible PPO structure. The letters describe the rules of the road; the network size describes how far that road actually goes. Always check the actual provider directory for your specific plan before you enroll, not just the plan type.

HMO: Health Maintenance Organization

HMOs are the most common structure in Medicare Advantage — 57% of all plans offered in 2026 are HMOs, though that share has actually shrunk from 71% back in 2017 as PPOs have gained ground.

How it works: You choose a primary care physician (PCP) from the plan’s network, and that doctor becomes your care coordinator. Need a specialist? Your PCP typically issues the referral. Stay within the network, and this system runs smoothly and affordably.

The catch: Go outside the network for something that isn’t a true emergency, and you’re generally responsible for 100% of the cost — not a higher copay, the entire bill. This is the detail that catches people off guard most, especially if they assumed “out-of-network” just meant “a bit more expensive,” the way it often does with employer insurance.

Why people choose it anyway: HMOs typically carry the lowest premiums and lowest out-of-pocket costs of the three types. If your current doctors are already in-network and you’re comfortable with a coordinated-care structure, an HMO is often the most cost-effective choice available.

PPO: Preferred Provider Organization

PPOs have grown fast — from just 17% of plans in 2017 to 42% in 2026 — largely because they solve the biggest complaint people have about HMOs: rigidity.

How it works: You can see any provider, in-network or out, without a referral. In-network care costs less, as you’d expect, but out-of-network care is still covered, just at a higher cost-sharing rate rather than being your full responsibility.

The trade-off: That flexibility isn’t free — PPO premiums typically run higher than HMO premiums for comparable coverage, and out-of-network coinsurance can run considerably higher than the in-network rate — commonly landing somewhere in the 30–50% range, depending on the specific plan, versus a modest flat copay for staying in-network.

Why people choose it: Frequent travelers, people who split time between two states, or anyone with a specific out-of-network specialist they’re not willing to give up tend to gravitate toward PPOs. Emergency and urgent care are always covered regardless of network status, on either plan type — that part doesn’t change.

Referral Rules Aren’t as Uniform as They Used to Be — Check the Specific Plan

For years, “HMO means you need a referral, PPO means you don’t” was a safe generalization. That’s gotten less reliable — referral requirements have genuinely started varying more by specific plan and carrier rather than following the old, simple HMO-vs-PPO rule. If a referral requirement would be a dealbreaker for you, the smart move isn’t to assume based on the plan type — it’s to confirm directly for the specific plan you’re considering.

Worth watching closely for 2026: some of the largest carriers are actually moving in the opposite direction from a “referrals are disappearing” trend. UnitedHealthcare, for example, is reinstating referral requirements for most of its HMO and HMO-POS members in 2026, explicitly describing it as bringing these plans “back in line with how a traditional HMO was designed to work” — with unreferred claims facing denial starting mid-2026. If referrals matter to you, check this specifically and don’t assume last year’s plan rules still apply this year, even with the same carrier.

Meanwhile, PPOs themselves are shrinking — and it’s about profitability, not popularity. It’s becoming genuinely harder for insurers to run a profitable PPO in Medicare Advantage. The out-of-network flexibility that makes PPOs attractive to consumers is exactly what makes them expensive to operate — carriers lose the cost control that comes from a negotiated, closed network. Going into 2026, PPO plan closures ran at roughly 12% year-over-year, notably outpacing HMO closures, and several major carriers have specifically cited this dynamic as they shift toward favoring HMO and HMO-POS designs going forward. If you’re specifically counting on PPO flexibility, it’s worth confirming your plan is stable rather than assuming it’ll be offered indefinitely.

Paul’s Honest Take: Most people are genuinely unfamiliar with how HMOs and PPOs actually differ, and HMOs carry an outdated stigma from years ago when referrals and gatekeeping were universal. That’s not automatically true anymore — but it’s also not automatically false, and it can change year to year even within the same carrier. The only reliable answer is to check the specific plan you’re looking at, every single year, rather than relying on what you remember about HMOs in general.

HMO-POS: The Hybrid Option

An HMO-POS earns its own section rather than a footnote, because it’s genuinely a distinct choice, not just a variant of an HMO.

How it works: For the vast majority of your care — your PCP, standard labs, local hospital visits — an HMO-POS behaves exactly like a strict HMO: you need a PCP, you need referrals, and you stay in-network. The difference is a deliberate, narrow “escape hatch”: the plan spells out specific circumstances where you’re permitted to go out-of-network — for example, a highly specialized surgery your local network genuinely can’t provide.

The catch: Using that escape hatch typically requires prior authorization from the plan before treatment, and it usually comes with a higher deductible or copay than staying in-network would. Think of it as HMO pricing for daily life, with a narrow safety valve for the rare situation your local network can’t cover — not full PPO-style freedom.

PFFS: Private Fee-for-Service

This one used to be far more common, and it’s worth understanding why it mostly isn’t anymore.

How it works: In theory, a PFFS plan lets you see any Medicare-approved provider who agrees to accept the plan’s payment terms — no fixed network, no referral required. Some PFFS plans layer a network on top anyway; others operate genuinely network-free.

The real catch: Provider acceptance is never guaranteed. Since there’s no contracted network, a provider can simply decline to accept the plan’s terms for a given visit — which means you need to confirm participation before every single appointment, not just once when you enroll. A doctor’s office might accept your PFFS plan’s terms this month and decline them the next time you call, if they’ve decided the reimbursement rate no longer works for them. The honest way to think about it: you’re not asking “are they in my network,” you’re asking “will they say yes today” — every single time.

Why they’re rare today: Federal network-adequacy requirements introduced in the years after PFFS plans first became popular pushed most insurers to convert these plans into standard HMO or PPO networks instead. Today, PFFS plans make up under 1% of the Medicare Advantage market — you’ll likely encounter the term in older materials or occasional niche plans, but it’s rarely anyone’s first or best option in 2026.

Paul’s Honest Take: If you come across a PFFS plan today, it’s worth asking directly why that structure is still being offered in your area — it’s uncommon enough that I’d want to understand the specific reasoning before recommending one over a standard HMO or PPO.

One More Related Term Worth Knowing

Special Needs Plans (SNPs): Not a network type on their own — SNPs are built around specific populations (chronic conditions, dual Medicare/Medicaid eligibility, or institutional care) and can be structured as either HMO or PPO underneath.

The Decision, Simplified

Choose an HMO if:

  • You want the lowest possible monthly cost, and you’re comfortable with that trade-off
  • Your current doctors and hospital are already in the plan’s network
  • You don’t mind seeing your PCP first to get a referral before a specialist visit

Choose a PPO if:

  • You want the freedom to see any Medicare-accepting doctor without network restrictions
  • You’d rather skip the PCP-as-gatekeeper structure and book specialists directly
  • You travel frequently, split time between states, or have a specific doctor you’re not willing to leave

Choose an HMO-POS if:

  • You want HMO-level pricing for your everyday care
  • There’s a real chance you’ll need one specific kind of specialized care your local network doesn’t offer
  • You’re comfortable navigating a prior-authorization step for that one exception, rather than having full PPO-style freedom everywhere

In short: the HMO is best for your wallet, provided you’re willing to follow its network rules. The PPO is best for your peace of mind, provided you’re willing to pay somewhat more for that freedom. HMO-POS splits the difference for people who mostly want HMO savings but need one specific door left open.

One last reminder before you decide: none of this advice matters as much as checking the actual network size and provider list for the specific plan you’re considering, in your specific zip code. A “good on paper” plan type with a thin local network can serve you worse than a “restrictive” plan type with a deep one.

Frequently Asked Questions

Should I pick my plan type first, or check the network first? Check the specific plan’s provider directory first, for your own doctors and local area, before you commit to a plan type in the abstract. A large HMO network can serve you better than a thin PPO network, even though the PPO technically allows more flexibility on paper.

Can I switch between an HMO and a PPO whenever I want? Only during specific windows — the fall Annual Enrollment Period (October 15 – December 7) or the Medicare Advantage Open Enrollment Period (January 1 – March 31), same as switching any Medicare Advantage plan.

Do all HMO plans absolutely require a referral? Not as uniformly as they used to — this now varies by specific plan and carrier rather than following a blanket rule, and it can even change year to year within the same carrier. Always confirm the specific plan’s current referral rules directly rather than assuming based on what HMOs have historically required.

If I’m in a PPO, is out-of-network care the same price as in-network? No — it’s covered, but typically at a meaningfully higher coinsurance or copay than staying in-network. Check the plan’s Evidence of Coverage for the exact out-of-network cost-sharing structure before assuming it’s a minor difference.

Is a PFFS plan ever a good choice? It can be, in specific niche situations — but given how rare and how uncertain provider acceptance can be, it’s worth a direct conversation about why that structure fits your situation better than a standard HMO or PPO before enrolling.

Does my Medicare Advantage MOOP work the same regardless of network type? Yes — the legal out-of-pocket cap applies across plan types, though PPOs often have two separate MOOP figures: one for in-network costs, and a higher combined figure that includes out-of-network spending.

The Bottom Line

HMO, PPO, HMO-POS, and PFFS aren’t just labels — they’re different answers to the same question: how much provider flexibility are you willing to trade for a lower monthly cost? HMOs trade flexibility for savings. PPOs trade some savings for real flexibility. HMO-POS splits the difference with a narrow escape hatch. PFFS, once a middle-ground option, has mostly faded out as federal rules pushed the market toward standard networks. Knowing which trade-off you’re actually comfortable with — and checking actual network size for your specific plan and zip code — is what makes this decision hold up well after you’ve enrolled.

Related Reading

Sources:

This article reflects 2026 Medicare Advantage plan structures and is for educational purposes. The right network type depends entirely on your doctors, travel habits, and budget — if you’d like help figuring out which structure fits your situation, call us at 631-358-5793. No pressure, no cost.

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.

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