Consequences of Not Enrolling in Medicare at 65

Consequences of Not Enrolling in Medicare at 65

The consequences of not enrolling in Medicare at 65 depend on which parts you delay and whether you have qualifying coverage. According to the Centers for Medicare & Medicaid Services, delaying Part B without an exception can raise your monthly premium by 10% for every full year you wait, for as long as you have Part B. A gap of 63 days or more without creditable prescription drug coverage may also lead to a Part D penalty, according to the Centers for Medicare & Medicaid Services.

It’s understandable to feel unsure about whether turning 65 means you must enroll right away. Your Initial Enrollment Period lasts seven months, beginning three months before your birthday month and ending three months after it. But qualifying coverage through your or your spouse’s current job may allow you to delay Part B without a late penalty.

This article explains when to enroll, how employer coverage affects your timing, and what penalties may apply if you wait. You’ll also learn why the type of coverage you have matters, so you can understand your options and avoid an unexpected gap or lasting extra costs.

Key Takeaways

  • Before delaying Part B, distinguish coverage through current employment from COBRA or retiree coverage, which may not protect you from a late penalty.
  • Keep the enrollment window tied to your 65th birthday in view, even if you expect to keep other insurance.
  • Consider Parts A, B, and D separately. The rules and possible penalties differ, especially if you must pay a Part A premium.
  • Find out whether your prescription drug coverage is creditable and keep its written proof to help protect against a Part D penalty.
  • When employer coverage ends, pay attention to the separate enrollment timing for Part B and prescription drug coverage.

Creditable prescription drug coverage

At 65, the key question is whether your existing drug plan is creditable, meaning it’s expected to pay at least as much as Medicare drug coverage. For Part B timing, coverage through your or your spouse’s current job may qualify for a Special Enrollment Period; drug coverage must be assessed separately for Part D.

Creditable Drug Coverage and Part D Penalties

Creditable prescription drug coverage is coverage expected to pay at least as much as Medicare Part D coverage. It matters because keeping it can help you delay Part D without a late enrollment penalty. According to the Centers for Medicare & Medicaid Services, in the United States, going more than 63 days without creditable prescription drug coverage can trigger the Medicare Part D late enrollment penalty.

Employer drug coverage may be creditable, but don’t assume every plan qualifies. Ask the employer plan for written notice stating whether its drug coverage is creditable, and keep that notice with your enrollment records. If the coverage isn’t creditable, a gap may put you at risk of a penalty when you later enroll in Part D.

The Part D penalty is based on the months you went without creditable drug coverage after becoming eligible. It is calculated using 1% of the national base beneficiary premium for each full month without coverage, then added to your Part D monthly premium. For example, a 14-month gap can produce a 14% penalty calculation. The penalty generally continues while you have Medicare drug coverage, even if you change plans.

Employer health coverage and employer drug coverage answer different questions. Current employment may create a Part B Special Enrollment Period, while the drug plan’s creditable status affects Part D. If you turn 65 while working, review both notices rather than treating one as proof for both parts of Medicare.

Avoiding Coverage Gaps After Employer Insurance

A coverage gap is a period after employer insurance ends when neither that plan nor Medicare drug coverage protects you. To reduce the risk, compare the employer plan’s end date with your Medicare enrollment timing, and arrange Part D coverage to start when the old drug coverage stops.

When work or employer coverage ends, the Part B Special Enrollment Period lasts 8 months, starting when work stops or the group health plan ends, whichever comes first. COBRA does not extend that Part B window. For Part D, people eligible for a Medicare Special Enrollment Period should enroll within the first 2 months of that period.

What counts as creditable employer health coverage for delaying Medicare? For Part B timing, it generally means group health coverage based on your or your spouse’s current employment. For Part D, the employer’s drug coverage must be expected to pay at least as much as Medicare drug coverage.

How do COBRA, retiree coverage, or Marketplace insurance affect Medicare enrollment penalties? COBRA and retiree coverage don’t qualify for the Part B Special Enrollment Period after current employment ends. Don’t treat either as extending the 8-month window; Marketplace coverage also isn’t the current-employer group coverage described for that exception.

Part B late enrollment penalty

Are you or your spouse still working at 65? Current employer group health coverage may let you delay Part B without a late penalty. The employer’s size and whether coverage is based on current employment matter. If work or that coverage ends, the Special Enrollment Period described in the previous section gives you a limited window to enroll.

According to the Centers for Medicare & Medicaid Services, for every full year a person delays Medicare Part B enrollment, their monthly premium increases by 10 percent for as long as they have Part B. This applies when someone could have enrolled but lacked an exception. The penalty is based on full years of delay, not simply the number of months since turning 65.

A two-year delay without a qualifying exception means a 20% penalty. That added amount continues while the person has Part B, so a delay can affect more than the first year of coverage.

Part A has a different rule. Most people qualify for premium-free Part A through their own or a spouse’s work history. For every full year a person delays Medicare Part B enrollment, their monthly premium increases by 10 percent for as long as they have Part B. If you qualify for premium-free Part A, you don’t pay a monthly Part A late enrollment penalty.

According to the Centers for Medicare & Medicaid Services, Medicare Part A’s late enrollment penalty is an additional 10% of the monthly premium for twice the number of years enrollment was delayed, if the person must pay a Part A premium. Unlike the Part B penalty, this increase lasts for a limited penalty period. For example, a two-year delay means paying the Part A penalty for four years.

Part D has its own penalty rules. A penalty may apply if you enroll late without creditable prescription drug coverage. People who qualify for Extra Help aren’t subject to the Part D penalty. The parts work differently: Part A’s penalty is temporary, while Part B’s generally lasts as long as you remain enrolled.

For people still working, employer coverage through their own job or a spouse’s job can affect Part B timing. At age 65, a person covered by a group health plan through an employer with 20 or more employees can generally delay Medicare enrollment, according to the Centers for Medicare & Medicaid Services. COBRA or retiree coverage isn’t the same as coverage from current employment for this exception.

If you’re comparing prescription coverage while planning your Medicare timing, a Medicare Part D plan may help address drug coverage needs once employer coverage ends.

Delaying Part B enrollment with employer group health insurance

Employer insurance decisions involve more than whether you remain covered. Separate the rules for medical enrollment from those for prescription coverage, and keep the dates and documents for each part organized.

The Part B Special Enrollment Period

This enrollment opportunity lets eligible people sign up for Part B after qualifying coverage connected to current employment ends. It provides a way to enroll after a change in work or coverage, rather than relying on the usual age-based window.

Ask the employer benefits office to document when active employment ends and when the group plan ends. Those dates can differ. Keep written proof of the coverage period and the employee’s work status, especially if coverage is through a spouse. These records help explain why you delayed and support a smoother application.

Who Can Delay Medicare Without a Penalty

People covered through their own or a spouse’s current job may qualify to delay Part B without a late penalty. The key is the source of coverage: insurance tied to active employment differs from coverage that continues after work ends.

Before deciding, ask the benefits office whether the plan is based on current employment and how it coordinates with Medicare. If you’re covered through a spouse, use the working spouse’s employment and plan documents, not just your insurance card. This distinction can help you avoid assuming that any continuing insurance automatically qualifies for an exception.

Coverage Start After Special Enrollment

For coverage timing, use the effective date provided after your completed Part B enrollment is processed. Compare that date with the employer plan’s termination date, and keep the enrollment confirmation with your benefits records. This helps you spot a possible transition gap instead of assuming coverage begins when you submit the paperwork.

Part D requires a separate review. If you decline a drug plan, you won’t have prescription coverage through Part D. Ask the employer plan for written confirmation of its creditable-coverage status and keep the notice with your records. Extra Help can remove the Part D late enrollment penalty for eligible people, but it doesn’t replace the need to understand what drug coverage you have.

Part A is a separate enrollment choice, too. Check whether you qualify for premium-free Part A and consider how enrolling could affect other benefits you use. For example, Medicare enrollment affects Health Savings Account contributions, including employer contributions. Review your HSA arrangements before choosing an enrollment date.

Keep a record of your employment status, health plan dates, drug coverage notice, and Medicare enrollment confirmation. This paper trail can make it easier to explain your coverage history and coordinate each part of Medicare with the insurance you already have.

Consequences of Not Enrolling in Medicare at 65

Initial enrollment period

Your first Medicare enrollment window is a chance to make separate choices about hospital, medical, and prescription coverage. Review each part against the insurance you already have, rather than treating “Medicare” as one all-or-nothing decision.

Start with a clear inventory. Write down who provides your current health insurance, whether it’s tied to active employment, and what it covers. Then note whether prescription drugs are included and whether the plan has provided a creditable-coverage notice. These details help you compare your existing coverage with the Medicare parts you may choose.

For Part A, consider whether your work history or a spouse’s work history qualifies you for premium-free coverage. For Part B, focus on whether you have insurance based on current employment and whether delaying enrollment fits your situation. Assess prescription coverage separately for Part D. A decision about one part doesn’t automatically settle the others.

A simple comparison can make the choices easier to discuss:

  • List the services and medicines your current insurance covers.
  • Note who holds the policy and whether employment is ongoing.
  • Keep the plan’s written information about prescription drug coverage.
  • Record which Medicare parts you are considering and why.

People with Marketplace coverage have another detail to handle. When you become eligible for Medicare at 65, sign up for Medicare and notify your Marketplace plan. If you receive Marketplace financial assistance during months when you also have Medicare, you may have to repay some or all of that assistance. If you plan to end Marketplace coverage, wait until Medicare has started before cancelling, so you don’t create a gap.

Also consider any Health Savings Account before enrolling. Once you’re enrolled in Medicare, including Part A alone, you can’t contribute to an HSA. You and your employer should stop HSA contributions 6 months before retirement or applying for Social Security or Railroad Retirement Board benefits to avoid a tax penalty. That timing can affect when you choose to begin Medicare enrollment.

Keep the decision focused on your own coverage. Someone with active employer insurance may face different considerations from a person relying on Marketplace coverage or paying for care without insurance. Record your current plan, drug coverage, and HSA status. This gives you a practical starting point for deciding which Medicare parts fit your circumstances and which enrollment questions to address first.

Medicare eligibility at age 65

In the United States, Medicare eligibility generally begins at age 65. That milestone makes it important to review your health coverage, but eligibility and enrollment are separate decisions. You may qualify for Medicare without needing to enroll in every part immediately. The deciding details include your current insurance, work situation, prescription drug coverage, and whether you qualify for premium-free Part A.

Start by identifying what coverage you already have and who provides it. Insurance through your own or your spouse’s current employer can affect when Part B enrollment makes sense. Retiree or Marketplace coverage works differently from insurance tied to current employment. Don’t assume an insurance card means every Medicare deadline or penalty rule is covered.

Eligibility doesn’t mean every part serves the same purpose. Part A covers eligible inpatient hospital care, Part B covers eligible medical services, and Part D covers prescription drugs. Medicare Advantage is another coverage path to consider when reviewing your options. Comparing these needs separately helps you see what your existing insurance pays for and where a coverage gap could arise.

In 2026, people with a Health Savings Account should account for Medicare enrollment before making contributions. People enrolled in Medicare, including those enrolled only in Part A, cannot contribute to an HSA. The rule can affect both your own contributions and employer contributions. If you’re approaching 65 with an HSA, include it in your enrollment planning instead of focusing only on monthly premiums.

The timing can matter before Medicare starts. People with an HSA and their employers should stop contributions 6 months before retirement or applying for Social Security or Railroad Retirement Board benefits to avoid a tax penalty. This means the date you apply for benefits or retire may affect your HSA contribution schedule. A clear timeline can prevent an overlooked contribution from creating a tax issue.

Marketplace coverage also needs a separate review. If you enroll in Medicare Part A and keep a Marketplace plan, you must pay the full Marketplace plan price, and Medicare becomes the primary payer. If you receive Marketplace financial assistance while covered by Medicare, you may have to repay some or all of that assistance for overlapping months. When leaving Marketplace coverage, wait until Medicare begins before cancelling to avoid a gap.

Age 65 is a useful point to compare eligibility, enrollment timing, and the coverage you need. If a Medicare Advantage plan is part of your review, compare Medicare Advantage options alongside your existing insurance and prescription drug needs.

The Modern Medicare Agency: Medicare Advantage Plans

The Modern Medicare Agency can help you compare Medicare Advantage Plans when you’re weighing coverage options after reviewing your enrollment timing. Its guidance can also help you consider whether a Medicare Supplement (Medigap) Plan or Medicare Part D Plan fits your needs. These are different coverage choices, so it helps to know what you want covered before selecting a plan.

If you’re approaching 65, leaving employer coverage, or reviewing your Medicare choices in 2026, The Modern Medicare Agency can help you compare options and make a more informed decision. You can also explore its Medicare Advantage plan information as you consider your next step.

Contact The Modern Medicare Agency to discuss your Medicare plan options.

Make your next Medicare decision with confidence

Understanding the consequences of not enrolling in Medicare at 65 can help you make a choice that fits your circumstances, rather than relying on assumptions. Take a moment to write down the coverage questions you still have and the decision you want to make next. A focused conversation can help turn uncertainty into a clearer path forward.

If you’d like support comparing Medicare plan options, contact an independent Medicare guide and talk through what matters to you.

You can take this one decision at a time. A little clarity now can help you move forward with greater confidence.

Frequently Asked Questions

Do I need to sign up for Medicare when I turn 65?

Not everyone needs to enroll in every Medicare part immediately at 65. If you have qualifying coverage through your or your spouse’s current job, you may be able to delay Part B. If you don’t have that coverage, delaying may bring penalties or leave medical costs uncovered. Check your insurance source and enrollment dates before your birthday month, then decide separately about hospital, medical, and prescription coverage.

What if I want or need to keep working past 65?

You may be able to keep working and delay Part B if you have qualifying group coverage through your current employer or your spouse’s current employer. According to the Centers for Medicare & Medicaid Services, someone covered through an employer with 20 or more employees can generally delay Medicare enrollment. When employment or group coverage ends, the Part B enrollment window begins, so coordinate dates with your employer’s benefits office.

Will I have to pay a premium for Part A?

Most people don’t pay a monthly premium for Part A. A person or spouse who worked and paid Medicare taxes for at least 10 years generally qualifies for premium-free Part A. If you don’t meet that work-history requirement, you may need to buy Part A.

What happens if you don’t enroll in Medicare at 65?

The consequences of not enrolling in Medicare at 65 depend on your coverage and which parts you delay. Without other insurance, you may have to pay medical and prescription costs yourself. Delaying Part B without a qualifying exception can lead to a lasting premium penalty, while a Part D penalty may apply after a gap in creditable drug coverage. Premium-free Part A has different rules from premium-bearing Part A.

What is the Medicare Part B late enrollment penalty and how is it calculated?

The Part B penalty adds 10% to your monthly premium for each full 12-month period you delayed enrollment without qualifying coverage. It generally continues for as long as you have Part B. For example, a two-year delay produces a 20% penalty.

What is the Medicare Part D late enrollment penalty and how much does it cost?

The Part D penalty is based on each full month you lacked creditable prescription drug coverage after becoming eligible. It generally continues while you have Part D coverage.

When can you enroll in Medicare after missing your initial enrollment period?

If you missed your Initial Enrollment Period and don’t qualify for a Special Enrollment Period, you can use the General Enrollment Period from January 1 to March 31. Coverage starts July 1 of that year. If you delayed Part B because of qualifying coverage through current employment, a Special Enrollment Period may apply after work or group coverage ends. The reason for delaying determines which window fits.

What health care costs might you face without Medicare coverage at 65?

Without Medicare or other insurance, you may be responsible for the full cost of covered care you receive, including hospital stays, medical services, and prescription drugs. The amount depends on the care, medicines, and providers involved. For example, someone who needs a hospital stay and ongoing prescriptions may face separate bills for each. Employer or other insurance can change what you pay, so review what it covers.

Paul Barrett

Article by

Paul Barrett

Paul Barrett, CMIP is the founder of The Modern Medicare Agency, an independent Medicare-only brokerage based in Melville, NY. With 18 years of Medicare-exclusive experience, a CMIP designation, and more than 5,000 clients served across 37 states, Paul is one of the most credentialed independent Medicare specialists on Long Island — and one of the most direct.

He represents 40+ carriers with no quotas and no allegiances, which means his recommendations are based entirely on what fits each client's specific situation. He is the author of Medicare Mastery Unlocked and host of the Wise Guys Retirement Talk podcast. His content is grounded in primary sources, real carrier intelligence, and 18 years of watching what happens when people get Medicare right — and when they don't.

📞 631-358-5793 | paulbinsurance.com

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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