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MSA vs HSA: Key Differences and Which One Fits Medicare

An HSA is a savings account you fund yourself while you have a qualifying high-deductible health plan and are not on Medicare. A Medicare MSA is a type of Medicare Advantage plan in which the government deposits money into an account for you. You can’t use both at once, and for most people turning 65 the real question is how to stop contributing to an HSA and spend what’s in it, not how to switch to an MSA.

The letters cause a lot of confusion because “MSA” can mean two different things. Below we separate them, compare the accounts side by side, and explain who each one suits.

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TL;DR

  • An HSA is for people under Medicare with an HSA-eligible high-deductible plan. You, and sometimes your employer, put money in.
  • A Medicare MSA is a Medicare Advantage option. Medicare, not you, deposits the money, and you can’t add your own.
  • Once you’re enrolled in Medicare you can no longer contribute to an HSA, but you can keep spending the balance on qualified medical costs.
  • Medicare MSAs are hard to find: for 2026 only one plan, in Wisconsin, was reported as available.
  • Archer MSAs, the older employer-and-self-employed accounts, are closed to new accounts.

Table of Contents

Two kinds of MSA, one HSA

People searching “MSA vs HSA” usually run into three different products that share a name or a purpose.

Health Savings Account (HSA). A tax-favored account for people covered by a high-deductible health plan (HDHP) who have no disqualifying other coverage. The IRS explains the rules in Publication 969. You own the account, and it stays with you if you change jobs.

Archer MSA. The predecessor to the HSA, built for self-employed people and employees of small employers. Under the IRS rules, you can no longer open a new Archer MSA, though some existing accounts continue.

Medicare MSA. A kind of consumer-directed Medicare Advantage (Part C) plan. Medicare describes it as similar to the HSA plans you might get through an employer or the Marketplace. It pairs a high-deductible insurance plan with a savings account that Medicare funds.

Three health account types and their differences

If you’re under 65 and working, the HSA is the one that matters. If you’re on or approaching Medicare, the Medicare MSA is the one in play, and only if you can find it.

MSA vs HSA side by side

Feature HSA Medicare MSA
Who it’s for People under Medicare with an HSA-eligible HDHP People enrolled in Medicare Parts A and B who choose this Medicare Advantage option
Who funds it You and, possibly, your employer The Medicare program only
Can you add your own money? Yes, up to the annual IRS limit No
Paired with An HSA-eligible high-deductible health plan A high-deductible Medicare Advantage plan
Provider network Depends on your health plan None: see any provider that accepts Medicare
Prescription drugs Whatever your health plan covers Not covered: you need a separate Part D plan
Unused money Rolls over every year, and it’s yours Rolls over within the account
Tax treatment Pre-tax or deductible contributions, tax-free growth, tax-free spending on qualified expenses Tax-free when used for qualified medical expenses
Availability Widely offered Very limited

The single biggest difference is the source of the money. With an HSA you decide how much goes in. With a Medicare MSA, Medicare makes a deposit at the start of the calendar year, or the first month your coverage begins if you join mid-year, and nobody else can add to it.

Can you have an HSA and Medicare at the same time?

You can’t contribute to an HSA once you’re enrolled in Medicare. IRS Publication 969 says eligibility for HSA contributions requires that you not be enrolled in Medicare. That applies to Part A as well as Part B, which is a trap for people who sign up for Social Security retirement benefits after 65, since Part A can start automatically and in some cases retroactively. Talk to a tax professional before your 65th birthday if you’re still contributing, because contributions made while you’re not eligible can trigger tax penalties.

HSA contributions stop while account remains usable

The account itself doesn’t vanish. You keep owning it, and you can keep paying qualified medical expenses from it tax-free. Many people use it to cover Medicare premiums other than Medigap, deductibles and copays, and dental or vision care that Original Medicare doesn’t cover. If you want the longer walkthrough, we cover the timing in our guide to HSAs and Medicare.

And you can’t roll an HSA into a Medicare MSA. They’re separate accounts under different rules, and a Medicare MSA only receives money from Medicare.

How a Medicare MSA actually works

The structure is simple, even if the fine print isn’t.

  1. You enroll in a Medicare MSA plan. You must be in Medicare Parts A and B to do so.
  2. Medicare deposits a set amount into your MSA for the year.
  3. You pay your medical costs from the account until you reach the plan’s deductible.
  4. After the deductible, the plan pays covered services in full, per the plan’s rules.
  5. Whatever you don’t spend stays in the account and carries into next year.

There is no separate plan premium. You do keep paying your Part B premium, which is $202.90 a month in 2026.

The gap between the deposit and the deductible

The deposit rarely equals the deductible. Medicare MSA plans pay nothing beyond the account until the deductible is met, so the difference comes out of your pocket. The maximum deductible allowed under federal rules in 2026 is $18,100, according to the Medicare Rights Center. The one plan reported for 2026, in Wisconsin, deposits $1,750 and carries a $4,000 deductible. In that example, you would be responsible for the $2,250 difference in a year with major medical bills. We walk through the numbers in our look at the deposit gap.

No network, but more homework

Medicare MSAs have no network, so you can see any doctor or hospital that accepts Medicare. That is a real advantage over HMOs and PPOs, where staying in network matters. If you worry about losing a doctor, our pages on Medicare Advantage network restrictions explain what to watch for in the other plan types.

The tradeoff is administrative. You track your spending against the deductible, pay providers from the account, and keep records. At tax time you need to report the account on a special form. The Medicare Rights Center identifies it as Form 8853.

Drugs are a separate purchase

Medicare MSA plans do not cover prescription drugs. If you enroll, you have to join a standalone Part D plan, or you’ll have no drug coverage. You can use your MSA money to pay Part D copayments, and Medicare says that spending counts toward your account in that situation. Our Part D overview explains how those plans are structured.

Who can’t join a Medicare MSA

Eligibility is narrower than for other Medicare Advantage plans. CMS guidance says you can’t elect an MSA plan if you have other coverage that would pay for the plan’s deductible. Examples include retiree coverage from an employer or union, TRICARE, VA benefits and FEHB coverage. Many people retiring with some form of secondary coverage are therefore ruled out before price even comes up.

The availability problem sits on top of that. Medicare Rights Center reports that for 2026 an MSA is offered only in Wisconsin, by one insurer. If you live anywhere else, the question is academic this year. Check your own ZIP code on Medicare’s plan finder during open enrollment.

Which one fits your situation

You’re under 65 and working with an HDHP. An HSA is likely the right tool. Contribute within the annual limit the IRS publishes, invest the balance if your plan allows, and plan to stop contributing before Medicare starts.

You’re turning 65 and still contributing to an HSA. Plan the stop date. Spend the balance on qualified costs in retirement. A Medicare MSA is not a continuation of your HSA.

You’re retiring from employer coverage. Your employer plan may be what keeps an MSA off the table. Most people in this position compare Original Medicare plus a Medigap policy against a standard Medicare Advantage plan. Our page on Medicare Supplement plans covers the first option.

You’re on Medicare because of a disability. The same rules apply: an MSA is only possible if one is offered where you live and you have no other coverage that would pay toward the deductible. Check Medicare Savings Programs too, which can help with Part A and B premiums if your income and resources are limited.

You live in Wisconsin and are healthy, with savings to cover a bad year. This is the narrow case where a Medicare MSA can make sense: you want free choice of providers, you’re comfortable managing money, and you can absorb a gap of thousands of dollars if you get seriously ill.

Perspective: what we tell people who ask about MSAs

As independent agents who focus on Medicare, we hear “MSA” and “HSA” mixed up constantly, often from people who’ve just been told they have to stop contributing to their HSA. Our first job is to untangle the names, because it’s hard to choose well when the terms mean different things.

Our view is that a Medicare MSA looks more attractive on paper than it works in practice for most people. The lack of a network is appealing, but the deductible is high, the deposit usually covers only part of it, drugs need a separate plan, and you carry the paperwork. People who enjoy managing their own spending can do well. People who want predictable costs usually do better with a Medigap plan or a standard Medicare Advantage plan with a low out-of-pocket maximum.

We also don’t start with a product. We start with your doctors, your prescriptions, your budget in a bad year and any coverage you’re keeping from an employer. Then we compare options across the 40+ carriers we work with, and we check in each year because plans change.

— Paul

Common mistakes to avoid

  • Contributing to an HSA after Medicare starts. Check your Part A start date, which can be earlier than you expect.
  • Assuming the MSA deposit equals your deductible. Compare the two numbers, and calculate the gap.
  • Forgetting Part D. Without a standalone drug plan, an MSA enrollee has no drug coverage.
  • Overlooking other coverage. Retiree, TRICARE, VA or FEHB coverage can block MSA enrollment.
  • Skipping the tax form. Medicare MSA owners have to report how they used the account.

Getting help choosing

If you’re approaching 65, leaving an employer plan, or unhappy with what you have, we can lay out the options that are actually available in your area and explain the tradeoffs without pressure. Start with our Medicare Advantage plan overview, or look at Medigap options if you want to keep Original Medicare and its freedom to see any doctor. You can also reach us through our home page.

FAQ

Is a medical savings account the same as an HSA?

No. An HSA is an account you fund yourself alongside an HSA-eligible high-deductible plan. A Medicare MSA is a Medicare Advantage plan with an account that only Medicare funds. Archer MSAs are a third, older type that is closed to new accounts.

Can I use my HSA money on Medicare?

Yes. You can’t add new contributions once you’re enrolled in Medicare, but you keep the account and can spend the balance tax-free on qualified medical expenses. Check the IRS list in Publication 969 or ask a tax professional about specific items.

Can I move my HSA into a Medicare MSA?

No. Medicare MSA funds come only from the Medicare program, and personal or employer contributions can’t be added. The two accounts stay separate.

Does a Medicare MSA cover prescriptions?

No. You must join a separate standalone Part D plan for drug coverage. Part D copayments do not count toward the MSA’s deductible, though you can pay them from your MSA funds.

Can I get a Medicare MSA anywhere in the U.S.?

Not in practice. For 2026, only one plan, in Wisconsin, was reported as available. Even where a plan exists, other health coverage such as retiree or VA benefits can make you ineligible.

Sources

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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