Medicare 2026

COBRA and Medicare: Why COBRA Doesn't Extend Your Part B Sign-Up Window

If you're leaving a job and weighing COBRA, there's one Medicare rule that catches many people off guard: in Medicare's eyes, COBRA is not the same as job-based coverage tied to current employment. That distinction matters because it decides whether you have extra time to sign up for Part B without a penalty — and the answer, in most cases, is no. Understanding this now can save you from a lifelong premium increase and gaps in care.

Why COBRA is treated differently

Medicare offers a Special Enrollment Period (SEP) for people who delay Part B because they had health coverage based on current employment — either their own or a spouse's. COBRA is continuation coverage after that employment ends, so Medicare does not count it as active employer coverage. The same is true for retiree health plans, VA coverage, individual Marketplace plans, and coverage you receive through severance or a layoff. Medicare & You 2027 lists all of these as not active employer coverage.

The practical result: the clock to sign up for Part B without a penalty starts the day your job ends or your job-based coverage ends — whichever is first — regardless of whether you elect COBRA afterward.

The 8-month Part B window

After employment ends, you generally have up to 8 months to enroll in Part B without a late-enrollment penalty. Electing COBRA does not pause or extend that window. If you wait until COBRA runs out — often 18 months, sometimes 36 — to think about Part B, you will likely be past the deadline.

Missing the window usually means waiting until the General Enrollment Period, which runs January 1 through March 31 each year. Coverage starts the month after you sign up. On top of the delay, your monthly Part B premium may go up 10% for each full 12 months you could have had Part B but didn't — and that surcharge typically sticks for as long as you have Part B.

What happens if you have COBRA and are Medicare-eligible

This is where real money is at stake. If you are eligible for Medicare but haven't enrolled, COBRA may pay only a small portion of your medical bills, assuming you had signed up for Medicare. You could be left paying most of the costs out of pocket — even though you're paying COBRA premiums every month.

The coordination rules depend on timing:

• COBRA first, then Medicare: Your COBRA coverage will probably end once you enroll in Medicare.
• Medicare first (because of age or disability), then COBRA: Medicare pays first, and COBRA may help with some remaining costs.
• End-Stage Renal Disease (ESRD): COBRA pays first during a coordination period of up to 30 months, then Medicare pays first.

Note that COBRA generally applies only to employers with 20 or more employees, and the standard offer is 18 months (36 in certain situations).

Prescription drug coverage: one SEP COBRA does offer

There is a bright spot. If your COBRA plan includes creditable prescription drug coverage (meaning it's expected to pay, on average, at least as much as standard Medicare Part D), you get a Special Enrollment Period to join a Medicare drug plan without a late-enrollment penalty when your COBRA ends. Your plan administrator sends a notice each year telling you whether your drug coverage is creditable — keep it.

For 2027, the Part D out-of-pocket cap is $2,400 (up from $2,100 in 2026), and no Part D plan may charge a deductible higher than $700. The national Part D base beneficiary premium — the figure used to calculate the Part D late-enrollment penalty — is $41.33 for 2027. Actual plan premiums vary.

What about Part B costs for 2027?

CMS typically announces the standard Part B premium, the Part B deductible, and the income-related adjustment (IRMAA) brackets in the fall, usually in November. Those 2027 figures have not yet been announced, so check Medicare.gov for the current numbers when planning.

Thinking about how you'll receive Medicare

Once you're enrolled in Parts A and B, you'll decide how to get your coverage. Two main paths:

• Original Medicare, often paired with a stand-alone Part D plan and sometimes a Medigap policy: You can generally see any provider that accepts Medicare. Medigap can help with Medicare's cost-sharing but adds a separate premium.
• Medicare Advantage (Part C): These plans bundle hospital, medical, and usually drug coverage. They often use networks and may include extra benefits, but rules and costs vary by plan.

Neither path is "best." The right fit depends on your doctors, prescriptions, travel habits, and budget. Use Medicare's plan finder to compare specifics.

If you have Medicaid or Extra Help

Since 2025, people with Medicaid or Extra Help have a monthly Special Enrollment Period to move to Original Medicare with a stand-alone Part D plan, or to switch stand-alone Part D plans. Full-benefit dual-eligible individuals can also enroll in an integrated D-SNP in any month.

Key dates for 2027 coverage

Annual Enrollment runs October 15 – December 7, 2026, with choices taking effect January 1, 2027. The Social Security Administration announced a 3.6% COLA for benefits payable beginning January 2027.

What does this mean for people with Medicare?

If you're approaching Medicare eligibility and considering COBRA, plan to enroll in Part B on time — don't let COBRA's duration lull you into missing your 8-month window. For personalized guidance and the most current figures, visit Medicare.gov or call 1-800-MEDICARE (1-800-633-4227), TTY 1-877-486-2048.