If you are on COBRA coverage and approaching 65, you face one of the most misunderstood rules in all of Medicare: COBRA does NOT count as active employer coverage, which means it does not protect you from Medicare late enrollment penalties. In 2026, the base Medicare Part B premium is $202.90 per month, and every 12-month period you delay adds a permanent 10% surcharge to that number for the rest of your life.
Quick Answer: Yes, you almost certainly still need to sign up for Medicare even if you are on COBRA. COBRA is not considered creditable coverage for Medicare Part B enrollment purposes. Your 8-month Special Enrollment Period (SEP) starts when your active employment ends, not when your COBRA expires. If you miss that window, you face lifetime penalties.
The confusion is understandable. COBRA feels like real insurance because it is the same plan you had at work. But under federal law, it is continuation coverage, not active employer coverage, and that distinction costs people thousands of dollars in penalties every year.
Why COBRA Does Not Protect Your Medicare Enrollment Window
When you leave a job and become eligible for Medicare, the law gives you an 8-month Special Enrollment Period to sign up for Part B without penalty. That 8-month clock starts on the day your active employer coverage ends or the day your employment ends, whichever comes first.
Here is where the trap is: if you elect COBRA instead of immediately signing up for Medicare, the 8-month SEP clock is still running. It does not pause. It does not reset when COBRA ends. Per Medicare.gov, "COBRA and retiree health coverage are not considered coverage based on current employment." That means they cannot extend your SEP.
So if you stop working in January, elect COBRA, and assume you have until COBRA runs out to enroll in Part B, you are wrong. Your 8-month window started in January. If you miss it, you must wait for the General Enrollment Period (January 1 to March 31 each year), and your Part B coverage will not start until July 1 of that year, creating a months-long gap.
The 2026 Medicare Part B Late Enrollment Penalty
The penalty is not a one-time fine. It is a permanent surcharge added to your monthly premium for life.
| Years Delayed | Penalty Added | Monthly Premium in 2026 |
|---|
| 0 (on time) | 0% | $202.90 |
| 1 year | 10% | $223.19 |
| 2 years | 20% | $243.48 |
| 3 years | 30% | $263.77 |
| 5 years | 50% | $304.35 |
| 7 years | 70% | $344.93 |
2026 Medicare Part B Late Enrollment Penalty Examples. Base premium: $202.90/month per CMS.gov.
A person who delays Part B by 2 years while thinking COBRA protects them will pay roughly $40 more per month, every month, for the rest of their lives. Over 20 years, that is nearly $10,000 in extra premiums for a single enrollment mistake.
How COBRA and Medicare Work Together (Coordination of Benefits)
If you are 65 or older and eligible for Medicare but remain on COBRA, the two plans do not pay equally. By law, Medicare pays first (primary payer) and COBRA pays second (secondary payer). According to CMS.gov, this order cannot be changed by your COBRA plan.
What that means practically:
- Your COBRA plan may deny claims if you were supposed to enroll in Medicare first. Many COBRA insurers will not pay as secondary if you skipped Medicare enrollment when you were required to enroll.
- You could be left paying the full bill for services that neither plan covers because they each assume the other is primary.
- COBRA premiums are high. COBRA typically costs 102% of the full plan premium. In many cases, Medicare Part A (usually free) plus Part B ($202.90/month in 2026) is significantly cheaper.
The one exception is End-Stage Renal Disease (ESRD). If you qualify for Medicare due to ESRD, COBRA coverage acts as primary payer for the first 30 months before Medicare takes over.
When You Turn 65 on COBRA: What to Do
When you are approaching 65 and are on COBRA, these are your options:
Option 1: Enroll in Medicare Parts A and B and drop COBRA
This is the most common and often most cost-effective path. Medicare Part A is typically free for people who worked 10 or more years. Part B costs $202.90/month in 2026. You can add a Medicare Supplement (Medigap) plan or a Medicare Advantage plan for additional coverage.
Option 2: Enroll in Medicare and keep COBRA as secondary
You can technically keep both, but Medicare is primary. COBRA acts as a secondary payer to cover cost-sharing Medicare leaves behind. Whether this saves money depends on your COBRA premium, Part B premium, and your expected healthcare usage. For most people, the math does not favor paying high COBRA premiums for secondary coverage.
Option 3: Do nothing and miss Medicare enrollment
This is not really an option. It leads to the permanent penalties described above and potential coverage gaps. Avoid this path entirely.
Medicare Enrollment Periods You Need to Know in 2026
Understanding which enrollment window applies to you determines everything.
Initial Enrollment Period (IEP)
If you are turning 65, your IEP is a 7-month window:
- 3 months before your birth month
- Your birth month
- 3 months after your birth month
If you enroll during the 3 months before your birthday month, Part B coverage starts the month you turn 65. If you enroll in your birthday month or the following month, your start date is delayed by one to three months.
Special Enrollment Period (SEP) for Active Workers
If you were still actively employed past 65 with employer-sponsored group health coverage based on that active employment, you qualify for an 8-month SEP to sign up for Part B when that coverage ends.
COBRA is not active employment coverage. The SEP starts when you leave your job, not when COBRA ends.
General Enrollment Period (GEP)
If you missed both IEP and SEP, you can enroll January 1 through March 31 each year. Part B coverage starts July 1. You will also face the late enrollment penalty unless you qualify for an exception.
Medicare Parts A, B, C, and D: Which Do You Need?
| Medicare Part | What It Covers | 2026 Premium (typical) | Enrollment Timing |
|---|
| Part A | Hospital, inpatient stays | $0 for most people | Sign up during IEP |
| Part B | Doctor visits, outpatient | $202.90/month | Sign up during IEP or SEP |
| Part C (Medicare Advantage) | Bundled A + B + often D | Varies by plan | After enrolling in A and B |
| Part D | Prescription drugs | Varies (avg ~$46/month) | Can delay if you have creditable drug coverage |
2026 Medicare premium estimates. Source: Medicare.gov.
Part A
Most people who worked at least 40 quarters (10 years) and paid Medicare taxes do not pay a Part A premium. There is little downside to enrolling in Part A even while on COBRA, since it costs nothing and the hospital coverage is valuable.
Part B
This is the critical one. Do not delay Part B enrollment past your IEP or valid SEP window. COBRA does not extend your window.
Part D (Prescription Drugs)
This is an area where COBRA can offer some protection. If your COBRA plan includes prescription drug coverage that meets Medicare's "creditable coverage" standard (meaning it is at least as good as the standard Medicare drug benefit), you can delay Part D enrollment without penalty for as long as you have that creditable drug coverage. Once COBRA ends, you have 63 days to enroll in Part D without a penalty.
Your COBRA plan administrator is required to send you a written notice each year about whether your drug coverage is creditable. Keep that notice. You may need it to prove you had creditable coverage if you enroll in Part D later.
How to Sign Up for Medicare in 2026
Step-by-step enrollment process:
- Confirm your eligibility. You qualify for Medicare at 65, or earlier if you have a qualifying disability or ESRD. Visit Medicare.gov to confirm your eligibility.
- Check your IEP window. Your IEP opens 3 months before your 65th birthday. Mark the date.
- Apply online at SSA.gov. Go to ssa.gov and apply for Medicare. The online application takes about 10 minutes.
- If you already receive Social Security benefits, you are automatically enrolled in Part A and Part B the month you turn 65. You may receive your Medicare card in the mail before your birthday.
- Decide on drug coverage. If your COBRA plan drug coverage is creditable, you can delay Part D. If not, enroll in a Part D plan during your IEP.
- Choose a supplement or Medicare Advantage plan. Original Medicare (Parts A and B) has cost-sharing. A Medigap policy or Medicare Advantage plan covers the gaps.
- Notify your COBRA plan. Once Medicare is your primary coverage, inform your COBRA administrator so they update their records.
Documents needed to apply:
- Proof of U.S. citizenship or legal residency (passport, birth certificate, or naturalization certificate)
- Social Security number
- Medicare card number (if you already have Part A)
- Employment and COBRA plan details (employer name, dates of coverage)
- Proof of creditable drug coverage if delaying Part D (letter from COBRA administrator)
Common reasons Medicare applications get delayed or denied:
- Missing your IEP window by assuming COBRA extends the deadline
- Not providing proof of U.S. citizenship
- Income reported incorrectly (affects IRMAA surcharges for higher earners)
- Applying for a Medicare Advantage or Part D plan before confirming Part B enrollment
- Not verifying creditable drug coverage status in writing before delaying Part D
What About Medicare Savings Programs?
If you are enrolling in Medicare and have limited income, you may qualify for a Medicare Savings Program (MSP), which helps pay Medicare premiums and cost-sharing. In 2026, these programs cover Part B premiums partially or in full for people with income below certain thresholds.
| MSP Program | Income Limit (Individual, 2026) | What It Pays |
|---|
| Qualified Medicare Beneficiary (QMB) | Up to $1,275/month | Part A + Part B premiums, deductibles, and cost-sharing |
| Specified Low-Income Medicare Beneficiary (SLMB) | $1,275 to $1,526/month | Part B premium only |
| Qualifying Individual (QI) | $1,526 to $1,715/month | Part B premium only |
2026 Medicare Savings Program income limits. Limits are approximate and vary by state. Source: Medicare.gov. Resource limits also apply.
If you are on COBRA and have limited income, it is worth checking whether an MSP could eliminate your Part B premium entirely once you enroll in Medicare.
Check your eligibility for Medicare Savings Programs at CoveredUSA in about 2 minutes.
Frequently Asked Questions
Does COBRA count as creditable coverage for Medicare Part B?
No. COBRA is not considered active employer-sponsored group health coverage for Medicare enrollment purposes. It does not give you a Special Enrollment Period and does not extend your 8-month window to sign up for Part B without penalty. Your SEP clock starts when you leave your job.
What happens if I just let my COBRA run out before signing up for Medicare?
You risk missing your SEP window entirely. Once you leave work, your 8-month SEP starts immediately regardless of whether you have COBRA. If you let COBRA run out after that window has closed, you cannot sign up for Part B until the General Enrollment Period (January through March), coverage will not start until July, and you will pay a permanent late enrollment penalty.
Can I keep COBRA and Medicare at the same time?
Yes, but Medicare must pay first. If you are 65 or older and enrolled in Medicare, COBRA automatically becomes the secondary payer. COBRA may refuse to pay claims if it finds out you should have been enrolled in Medicare and were not.
Does COBRA drug coverage (Part D) count as creditable coverage?
Often yes. Many employer-sponsored drug plans, including those offered via COBRA, are creditable. Your COBRA administrator must notify you in writing each year whether the drug coverage is creditable. If it is, you can delay Part D enrollment until you lose that coverage, with a 63-day grace period after COBRA ends.
How much will the Part B penalty cost me in 2026?
In 2026, the base Part B premium is $202.90/month. For every 12-month period you could have had Part B but did not enroll (while on COBRA does not count as an excuse), you pay 10% more permanently. Two years of delay means 20% more, or about $40 extra per month for life.
When does the 8-month Special Enrollment Period start?
It starts on the first day of the month following the month in which either (a) your active employment ends or (b) your group health coverage based on active employment ends, whichever comes first. COBRA elections do not move this date.
What if I have a disability and am on COBRA under age 65?
Medicare eligibility before age 65 based on disability begins after 24 months of receiving Social Security Disability Insurance (SSDI). The same COBRA rules apply: once Medicare eligibility begins, you should enroll in Part B during your IEP. COBRA still becomes secondary once Medicare is active.
Can I get help paying for Medicare if my income is low?
Yes. Medicare Savings Programs and the Extra Help (Low Income Subsidy) program for Part D can reduce or eliminate premiums and cost-sharing. Use the free screener at CoveredUSA to check whether you qualify for these programs based on your income and household size.
The Bottom Line
COBRA keeps you insured after leaving a job, but it is not a substitute for Medicare enrollment. The two biggest mistakes people on COBRA make when turning 65 are (1) assuming COBRA extends their Medicare enrollment window, and (2) assuming COBRA will cover their bills if they skip Medicare. Neither is true.
Check your Medicare eligibility now at CoveredUSA, it takes 2 minutes. The screener will also show you whether you qualify for a Medicare Savings Program, Extra Help, or other coverage based on your income and household size.
For authoritative Medicare enrollment guidance, visit Medicare.gov, call 1-800-MEDICARE, or contact your local State Health Insurance Assistance Program (SHIP) for free, unbiased counseling.
CoveredUSA is not connected with or endorsed by the United States government or the federal Medicare program.
