How to Get Medicare While Working?
How to Get Medicare While Working?
Getting Medicare while still working is one of the most consequential health insurance decisions a person approaching or past age 65 will face — and it is one of the most commonly mishandled, because the rules are genuinely counterintuitive and the penalties for getting them wrong are permanent. The standard Medicare enrollment window opens at 65, but whether you should enroll at 65, delay enrollment, enroll in some parts and not others, or take no action at all depends entirely on your specific situation: how large your employer is, whether you are the employee or covered as a dependent on a spouse’s plan, whether you contribute to a Health Savings Account, and when you actually plan to stop working. At Diversified Insurance Brokers, Tonia Pettitt, CMIP©, works with clients across all fifty states on exactly these decisions — helping people avoid the enrollment mistakes that create years of unnecessary premium penalties or gaps in coverage that show up as unpaid claims. This guide is written to give you the factual framework to understand your options correctly, regardless of where you ultimately obtain your coverage.
The most important overarching fact about Medicare while working is this: there is no universal right answer. A 66-year-old at a 500-person corporation with an HSA can benefit from delaying both Part A and Part B without penalty. A 65-year-old at a 15-person employer must enroll in Parts A and B immediately or risk having claims denied entirely. A 65-year-old covered under a spouse’s employer plan faces rules that depend on both the spouse’s employment status and the employer’s size. Getting the framework right before making any decision is the only way to avoid outcomes that can cost tens of thousands of dollars over a retirement. The Medicare calculator and advisory resources on this page are provided specifically to help with that analysis.
The 20-Employee Rule: The Single Most Important Variable
Every Medicare enrollment decision for a working person starts with one question: does your employer — or your spouse’s employer, if you are covered as a dependent — have twenty or more employees? This threshold, established under the Medicare Secondary Payer rules, determines which coverage pays first when both Medicare and employer insurance are in effect simultaneously. It is not a suggestion or a guideline — it is a federal statutory rule with direct financial consequences for providers, employers, and patients.
When your employer has twenty or more employees, your employer plan is the primary payer and Medicare is the secondary payer. This means your employer insurance pays first on any claim, Medicare may pay second, and you have a federally protected right to delay Medicare Part B enrollment without triggering a late enrollment penalty — as long as you maintain coverage under the qualifying employer plan. When your employer has fewer than twenty employees, Medicare becomes the primary payer at age 65, and your employer plan becomes secondary. If you do not enroll in Medicare Parts A and B when first eligible, your employer plan is legally permitted — and in many cases required — to pay as if Medicare had already paid its share. In practice this means your employer plan may pay little or nothing on claims that Medicare would have covered, leaving you with large out-of-pocket costs despite having employer insurance. The employee count is calculated differently depending on the employer type — for multi-employer plans and union plans the rules have additional nuance — which is why confirming the actual employee count in writing from your HR department before making any Medicare decision is strongly advisable. Our resource on creditable coverage and employer size provides additional detail on how these thresholds work across different employer structures.
Medicare Enrollment Rules by Situation
| Situation | Part A | Part B | Part D | HSA |
|---|---|---|---|---|
| Employer 20+ employees, your own coverage, no HSA | Enroll at 65 (free) | Can delay — SEP protects you | Can delay if employer drug coverage is creditable | No restriction until Medicare starts |
| Employer 20+ employees, contributing to HSA | Delay Part A — enrollment stops HSA contributions | Can delay — SEP protects you | Can delay if drug coverage is creditable | Stop contributions 6 months before Part A enrollment to avoid retroactive coverage issue |
| Employer fewer than 20 employees | Enroll at 65 — Medicare is primary | Enroll at 65 — required for full coverage | Enroll if employer drug coverage is not creditable | HSA contributions must stop at Medicare enrollment |
| Covered as dependent on spouse’s plan (spouse actively working, 20+ employee employer) | Enroll at 65 if free; delay only if HSA concern | Can delay — SEP protects you while spouse actively works | Can delay if drug coverage is creditable | Your enrollment in Medicare stops your own HSA contributions; does not affect spouse’s HSA |
| On COBRA after leaving employer | Enroll promptly — COBRA does not extend SEP | 8-month SEP runs from end of active employment — NOT from end of COBRA | Enroll within the SEP window | N/A — COBRA not an HSA-eligible HDHP in most cases |
Medicare Part A While Working: Usually Enroll, With One Critical Exception
Medicare Part A covers inpatient hospital care, skilled nursing facility stays, hospice, and some home health services. For most people who have worked forty or more quarters (ten years) paying Medicare taxes, Part A is premium-free. Because it costs nothing in most cases, conventional wisdom is to enroll in Part A at 65 even if you are still working and maintaining employer coverage. Part A can serve as a useful secondary payer behind your employer plan, potentially covering cost-sharing your employer plan would otherwise leave exposed. Our resource on Medicare Part A explained covers what the coverage includes and how it coordinates with other insurance.
The one situation where enrolling in Part A at 65 is genuinely inadvisable is when you are actively contributing to a Health Savings Account. Enrolling in any part of Medicare — including premium-free Part A — makes you ineligible to make further contributions to an HSA from the month your Medicare coverage begins. Worse, Medicare Part A coverage is retroactive for up to six months prior to your application date if you are already past 65 when you apply. This means a person who applies for Part A at age 67 may have their Part A coverage start retroactively at age 66 and a half — making any HSA contributions made in those six months retroactively ineligible, potentially subject to taxes and a 6% excise penalty on excess contributions. The correct approach for an HSA contributor planning to eventually enroll in Part A is to stop HSA contributions at least six months before the planned Part A enrollment date to eliminate this retroactive coverage overlap. Our resource on how income affects Social Security and Medicare covers the IRMAA and HSA interaction for higher-income working individuals.
Medicare Part B While Working: The Decision That Carries the Permanent Penalty
Medicare Part B covers outpatient medical services — doctor visits, specialist consultations, diagnostic tests, preventive services, outpatient surgery, and durable medical equipment. Unlike Part A, Part B carries a monthly premium. The standard Part B premium is $202.90 per month in 2026, with an annual deductible of $257. After the deductible, Part B covers eighty percent of Medicare-approved charges, leaving the beneficiary responsible for twenty percent coinsurance with no out-of-pocket maximum under Original Medicare alone.
The Part B late enrollment penalty is among the most consequential financial decisions in Medicare planning because it is permanent. The penalty adds ten percent to the standard Part B premium for each full twelve-month period the person was eligible for Part B but did not enroll. At the 2026 standard premium of $202.90 per month, two years of unjustified delay adds $40.58 per month permanently — every month for the rest of your life. A five-year unjustified delay adds approximately $101 per month permanently. Over twenty years of retirement, the cumulative cost of that delay can approach $24,000 or more, compounding further as the base premium rises with annual adjustments. The penalty applies regardless of income — IRMAA surcharges for high earners are separate and calculated on top. Our resource on Medicare Part B explained covers coverage, costs, and the penalty mechanics in full detail.
The critically important exception that allows penalty-free delay of Part B is qualifying employer coverage from an employer with twenty or more employees. As long as you maintain active coverage under such an employer plan — your own or a spouse’s — you have a federally protected Special Enrollment Period (SEP) that allows you to enroll in Part B within eight months of the employment ending or the coverage ending, whichever comes first, without any penalty. This SEP is your safety net. It does not apply to COBRA, retiree coverage, or individual market coverage — only active employer group health plan coverage from a qualifying employer. Our resource on Medicare services and the broader Medicare blog cover enrollment timing decisions for a wide range of working situations.
The COBRA Trap: Why Millions Make This Mistake
One of the most common and costly Medicare enrollment mistakes made by working Americans involves COBRA. When an employee leaves their job, they typically receive a COBRA election notice informing them they can continue their employer health coverage for up to eighteen months by paying the full premium. For someone who is sixty-five or older, the natural instinct may be to elect COBRA while evaluating Medicare options — but this is almost always wrong, and the cost of the mistake is permanent.
COBRA coverage is not qualifying employer coverage for Medicare Special Enrollment Period purposes. The eight-month SEP clock begins on the date active employment ends — not on the date COBRA coverage ends. A person who retires at 66, elects COBRA, and assumes they can wait out the eighteen months of COBRA before enrolling in Medicare without penalty will find themselves facing two full years of unjustified Part B delay and a twenty percent permanent premium surcharge. This mistake is so common that Medicare’s own enrollment guidance explicitly identifies COBRA as a non-qualifying coverage for SEP purposes. The correct approach: if you are sixty-five or older when your active employment ends, contact Social Security to begin Part B enrollment during your eight-month SEP window — do not wait for COBRA coverage to expire. Retiree health coverage provided by a former employer carries the same warning: it is not active employer coverage, it does not protect against the Part B penalty, and it does not restart the SEP clock.
Medicare Part D and Drug Coverage While Working
Medicare Part D covers prescription drugs. Like Part B, Part D has a late enrollment penalty for periods without qualifying drug coverage — calculated as approximately $0.35 per month for each month of unjustified delay, added permanently to the Part D premium. The key protection against the Part D penalty for working individuals is creditable prescription drug coverage: employer-sponsored drug coverage that meets or exceeds the actuarial value of standard Medicare Part D.
Employers are required by law to notify employees whether their drug coverage is creditable or non-creditable. If your employer’s drug coverage is creditable, you can delay Part D enrollment without penalty for as long as you maintain that coverage and enroll within the SEP window when it ends. If the employer’s drug coverage is not creditable, you should enroll in Part D at sixty-five to avoid accumulating penalty months. Keep all written documentation your employer provides about creditable coverage status — you will need it when you eventually enroll in Part D to document your protected delay period. Our resource on Medicare Part D explained covers the creditable coverage standard and how to confirm your plan’s status. The resource on how Medicare and Social Security work together addresses timing coordination for those near retirement who are evaluating both simultaneously.
Spouse Coverage and Mixed-Age Households
Medicare enrollment decisions become more complex in households where one spouse is sixty-five or older and the other is not — particularly when the younger spouse is the active employee whose plan covers the older spouse as a dependent. The older spouse’s Medicare enrollment rights depend on the active employment status of the younger working spouse and the employer’s size. As long as the younger spouse is actively employed at a qualifying employer with twenty or more employees and the older spouse is covered under that plan, the older spouse has the same SEP protection and Part B delay rights as the employee. The protection ends when the working spouse’s employment ends — triggering the eight-month SEP for the dependent spouse as well.
Households where both spouses are approaching sixty-five face an additional coordination challenge: Medicare decisions are made individually. Each spouse evaluates their own enrollment situation at their own sixty-fifth birthday, and the optimal strategy for each person may differ. A sixty-five-year-old spouse at a large employer with an HSA may delay both Part A and Part B. Their sixty-five-year-old partner covered as a dependent under the same plan faces the same rules. The key error to avoid is assuming a joint decision applies equally to both — especially if one spouse has disability coverage through Social Security, which triggers automatic Medicare enrollment that follows different timing rules entirely. Our resource on how Social Security disability impacts retirement benefits covers the Medicare-disability enrollment interaction specifically.
A Practical Medicare Timing Checklist for Working People at 65
Navigating Medicare enrollment correctly while working requires taking several concrete steps well before your sixty-fifth birthday — not at it. The sequence matters because some decisions have waiting periods, documentation requirements, and enrollment windows that cannot be retroactively corrected. Confirming your employer’s size in writing from HR is the first step — do not rely on a general impression. Requesting a written creditable coverage notice for both medical and drug coverage creates the documentation record you will need when you eventually enroll. Evaluating whether you are actively contributing to an HSA — and when to stop contributions to eliminate the retroactive Part A overlap risk — is a calculation that should be made at least six months before any planned Medicare enrollment date.
If you are approaching sixty-five and approaching a planned retirement date within two to three years, understanding the income-related surcharges under IRMAA is also relevant. For 2026, Medicare beneficiaries who earn over $109,000 as individuals or $218,000 as joint filers pay IRMAA surcharges on top of the standard Part B and Part D premiums. IRMAA is based on income reported two years prior, which means a person retiring at sixty-five and enrolling in Medicare will have their first year’s premiums calculated on income from two years before enrollment — potentially the final high-earning years of employment. The Social Security Administration adjusts IRMAA if income has dropped significantly due to a qualifying life event like retirement, and Form SSA-44 is the mechanism for requesting that adjustment. Our resource on reducing taxes on Social Security covers the income planning strategies that affect both IRMAA and Social Security benefit taxation in the years surrounding retirement. The resource on maximizing Social Security benefits addresses how Medicare enrollment timing interacts with Social Security claiming decisions, and our resource on whether you are leaving Social Security benefits on the table provides a broader retirement income optimization framework for working seniors approaching retirement.
What Happens to Long-Term Care Planning When You’re Still Working
Working past sixty-five has one significant financial planning benefit beyond the income itself: it is often the best window to address long-term care insurance before the medical underwriting process becomes more challenging. LTC insurance premiums are driven largely by age at application — every year of delay increases costs and reduces the likelihood of qualifying at preferred health classifications. A person who is sixty-five, still employed, and in good health is in a fundamentally stronger position to lock in LTC coverage than they will be at sixty-eight or seventy, regardless of whether Medicare or employer insurance is the primary coverage at the time of application. Medicare does not cover long-term custodial care — the daily assistance with bathing, dressing, eating, and mobility that defines most nursing home and home care need — and employer health insurance ends at retirement. Our resource on whether you can still get LTC insurance after sixty addresses the underwriting windows and timing considerations for working seniors. The resource on whether Medicare and long-term care insurance are the same clarifies the critical coverage gap that Medicare leaves permanently unfilled, regardless of when you enroll. Our resource on affordable LTC options for retirees covers the specific product structures — traditional LTC, hybrid annuity-LTC, and hybrid life-LTC — available to people making these decisions during the transition from employment to retirement.
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Frequently Asked Questions: How to Get Medicare While Working
Do I have to sign up for Medicare at 65 if I am still working?
It depends entirely on the size of your employer. If your employer has twenty or more employees and you have active coverage under their group health plan, you have a federally protected right to delay Medicare Part B enrollment without penalty. You can also typically delay Part D enrollment if your employer’s drug coverage is creditable. Many people in this situation choose to enroll in premium-free Part A at sixty-five as secondary hospital coverage, while delaying Part B to avoid the monthly premium until they stop working. However, if you are actively contributing to a Health Savings Account, enrolling in any part of Medicare — including free Part A — makes further HSA contributions ineligible, so that calculation must be made individually. If your employer has fewer than twenty employees, you should enroll in both Medicare Parts A and B at sixty-five because Medicare becomes your primary payer. Without it, your employer plan may pay claims as if Medicare had already covered them, leaving you with large uncovered costs. Our resource on creditable coverage and employer size provides further detail on how employee count is determined.
What is the Medicare Part B late enrollment penalty and how much does it cost?
The Medicare Part B late enrollment penalty is a permanent ten percent premium surcharge added for each full twelve-month period you were eligible for Part B but did not enroll without a qualifying exception such as active employer coverage. The 2026 standard Part B premium is $202.90 per month. Two years of unjustified delay adds approximately $40.58 per month permanently — roughly $487 per year, every year for life. A five-year delay adds approximately $101 per month permanently. Over twenty years of retirement, a two-year penalty costs over $9,700 in extra premiums before accounting for annual premium increases. The penalty is applied to the standard premium before any IRMAA income surcharges are calculated, so high earners face the penalty layered on top of their already-elevated premiums. The penalty cannot be removed except in rare cases of officially documented misinformation from Social Security or Medicare. Prevention through correct enrollment timing is the only reliable protection. Our resource on Medicare Part B explained covers the penalty structure and the qualifying exceptions in full.
Can I keep my HSA if I enroll in Medicare?
No — enrolling in any part of Medicare makes you ineligible to make further contributions to a Health Savings Account from the month your Medicare coverage begins. You can still use existing HSA funds tax-free to pay for qualified medical expenses including Medicare premiums for Parts B, D, and Medicare Advantage, deductibles, and copayments. But new contributions to the HSA are prohibited once Medicare coverage is active. The particularly dangerous aspect of this rule involves Medicare Part A’s retroactive coverage: when you apply for Medicare Part A after turning sixty-five, coverage may be backdated up to six months. If you were contributing to your HSA during those six retroactively covered months, those contributions become ineligible and subject to income tax plus a six percent excise penalty on excess contributions. The correct approach for anyone who plans to keep contributing to an HSA and then enroll in Part A is to stop all HSA contributions at least six months before the planned Part A start date, ensuring the retroactive coverage window does not reach back into months with contributions. Our resource on how income affects Social Security and Medicare addresses the tax planning considerations surrounding HSA use in the Medicare transition period.
Does COBRA count as qualifying coverage to delay Medicare?
No — COBRA is not qualifying active employer coverage for Medicare Special Enrollment Period purposes. This is one of the most common and costly Medicare enrollment mistakes made. When your active employment ends, the eight-month SEP window for penalty-free Part B enrollment begins immediately — it does not pause while you are on COBRA. A sixty-five-year-old who retires, elects eighteen months of COBRA, and assumes they can wait out the COBRA period before enrolling in Medicare will lose months of their SEP and may face permanent late enrollment penalties when they eventually enroll. The correct approach is to initiate Part B enrollment through Social Security during the eight-month SEP that begins when your active employment ends, regardless of whether you have elected COBRA. Similarly, retiree health coverage provided by a former employer, union coverage not based on current employment, and individual market health plans do not qualify for the SEP and do not protect against late enrollment penalties. See our resource on Medicare planning articles for additional guidance on post-employment enrollment decisions.
What if I am covered under my spouse’s employer plan — can I still delay Medicare?
Yes, in most cases — provided your spouse is actively employed and their employer has twenty or more employees. Coverage under a spouse’s active employer group health plan qualifies for the same Part B delay protection and SEP rights as coverage under your own employer’s plan, as long as the employer meets the twenty-employee threshold. If your spouse’s employer has fewer than twenty employees, Medicare becomes the primary payer for you at sixty-five regardless of the spousal coverage, and you should enroll in Parts A and B accordingly. The protection is tied to the active employment status of the employee spouse — if the working spouse retires or loses the job, your eight-month SEP clock starts on the date that active coverage ends, not on the date you become aware of it or take any action. In mixed-age households where the older spouse depends on the younger working spouse’s plan, monitoring the younger spouse’s employment situation and being prepared to enroll in Medicare within eight months of any employment or coverage change is essential. Our resource on when to start Social Security benefits addresses related timing decisions for couples navigating retirement at different ages.
What is IRMAA and how does it affect Medicare premiums for working people?
IRMAA stands for Income-Related Monthly Adjustment Amount and is a surcharge added to the standard Medicare Part B and Part D premiums for individuals and couples whose modified adjusted gross income exceeds defined thresholds. For 2026, the IRMAA threshold begins at $109,000 of MAGI for individuals and $218,000 for joint filers. IRMAA is calculated using income from two years prior to the current coverage year — so 2026 premiums are based on 2024 tax return income. For a person who worked a full high-earning year in 2024 and retires and enrolls in Medicare in 2026, their first year of Medicare premiums may be at IRMAA-elevated levels even though their current income is much lower. If income has dropped significantly due to a qualifying life event — retirement, divorce, death of a spouse, loss of income-producing property, or reduced work hours — you can appeal IRMAA by filing Form SSA-44 with the Social Security Administration, which can adjust your premium tier to reflect current income. Our resource on whether Social Security is taxable covers how provisional income calculations — which include Medicare premiums — interact with Social Security benefit taxation in the first years of retirement.
What does Medicare NOT cover that I should plan for separately?
Medicare covers a broad range of medically necessary services but has several significant coverage gaps that working people approaching retirement should address before employer coverage ends. Long-term custodial care — the daily assistance with activities of daily living such as bathing, dressing, eating, toileting, and transferring that defines most nursing home and assisted living need — is not covered by Medicare. Medicare may cover skilled nursing facility stays for up to one hundred days following a qualifying hospital stay, but custodial care beyond that window is entirely self-funded unless a separate long-term care insurance policy is in place. Routine dental care, vision exams and eyeglasses, hearing aids, and most routine foot care are also not covered by Original Medicare. Prescription drugs require separate Part D coverage or a Medicare Advantage plan that includes drug benefits. The twenty percent coinsurance under Part B has no out-of-pocket maximum under Original Medicare, meaning a high-cost medical event can generate unlimited cost-sharing without a Medicare Supplement (Medigap) policy. Our resource on long-term care insurance services addresses planning for the custodial care gap specifically, and the resource on whether LTC insurance can be used overseas covers coverage for retirees who spend significant time internationally.
What steps should I take in the year before I plan to retire to get Medicare right?
The year before planned retirement is the optimal time to build a complete Medicare enrollment plan. Step one: confirm your employer’s size in writing from HR — the twenty-employee threshold must be verified with documentation, not assumption. Step two: request a written creditable coverage notice for both medical and drug coverage from your benefits administrator. Step three: if you are contributing to an HSA and plan to enroll in Part A, stop contributions at least six months before your target Part A enrollment date to avoid the retroactive coverage penalty. Step four: review your IRMAA exposure — your first year of Medicare premiums will be based on income from two years prior, and if that income included full-year employment earnings at peak salary, you may be in an elevated premium tier. Step five: evaluate long-term care insurance while you are still working, in good health, and most likely to qualify at preferred rates — LTC underwriting becomes significantly more difficult in the late sixties and seventies. Step six: contact an independent Medicare advisor well in advance of your retirement date to model the complete transition, including Medicare Supplement vs. Medicare Advantage considerations, Social Security claiming coordination, and any income adjustments that could affect IRMAA. Our Medicare second opinion service and resource on Social Security filing checklist support both of these preparatory steps.
About the Author:
Tonia Pettitt, CMIP©, is a seasoned Medicare specialist with more than 40 years of hands-on experience guiding individuals and families through the complexities of Medicare planning. As a senior advisor with the nationally licensed independent agency Diversified Insurance Brokers, Tonia provides clear, dependable guidance across all areas of Medicare—including Medicare Advantage, Medicare Supplement (Medigap), and Part D prescription coverage. Leveraging active contracts with dozens of highly rated insurance carriers, she helps clients compare options objectively and secure the most suitable coverage for their health and budget.
Known for her patient, education-first approach, Tonia has built a reputation as a trusted resource for retirees seeking reliable, unbiased Medicare support. With four decades of experience across evolving Medicare laws, carrier changes, and plan structures, she brings unmatched insight to every client conversation—ensuring clients feel confident, protected, and fully prepared for each stage of their retirement healthcare journey.
Explore More Medicare Options: Browse our complete guide to Enroll in Medicare at 65 — covering when to sign up, avoiding penalties, open enrollment, switching plans & key deadlines.
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