Medicare 2026

Retiree Health Coverage and Medicare: Who Pays First and What to Check Before You Enroll

If you're heading into Medicare with a retiree health plan from a former employer or union, the two can work together — but the rules aren't always intuitive. Here's a plain-English look at how the coverages coordinate, what to confirm before you make changes, and the dates and figures that matter as you plan.

How the two coverages coordinate

Retiree coverage is health insurance from a job you no longer work at. Because it isn't tied to current employment, Medicare generally pays first once you're eligible, and the retiree plan pays second on what Medicare doesn't cover. That second-payer role is why Medicare.gov notes retiree coverage is probably similar to a Medigap policy in how it fills in behind Medicare.

Two practical consequences follow. First, most retirees need both Part A and Part B to get the full value of their retiree plan — the plan may not pay for care that Medicare would have covered during any period you were eligible for Medicare but didn't sign up. Second, because retiree coverage isn't considered coverage based on current employment, losing it generally does not trigger a Special Enrollment Period to sign up for Medicare. That makes timing your initial Medicare enrollment especially important.

Retiree benefits can change

Employers and unions aren't required to offer retiree health coverage. They can modify benefits, raise premiums, or discontinue the plan. If you're counting on the coverage long term, read the plan materials carefully, keep an eye on annual notices, and have a backup plan in mind in case the benefit changes.

Before you change anything, ask one question

Medicare.gov is clear on this: before you enroll in a Medicare drug plan — or any Medicare plan your former employer doesn't offer — ask the retiree plan whether doing so will cause you, your spouse, or your dependents to lose retiree coverage, including non-drug health benefits. Medicare's guidance on coordinating with other insurance warns that employer or union coverage lost this way may not be available again. One phone call to the plan administrator before you enroll can prevent an irreversible mistake.

Drug coverage: creditable or not

Each year, your employer or union must send a notice telling you whether your retiree drug coverage is "creditable" — meaning it's expected to pay, on average, at least as much as standard Medicare Part D. If your drug coverage is creditable, you can delay joining a Part D plan without a late-enrollment penalty, as long as you don't go 63 or more days without creditable drug coverage.

Hold on to those annual notices. If your retiree drug coverage ends later and you need to join Part D, that paperwork is how you prove you avoided a gap.

A few 2027 Part D program figures to know, regardless of which plan you're in:

• The out-of-pocket cap on covered drugs is $2,400 in 2027 (it's $2,100 in 2026).
• The most any Part D plan can charge as a deductible is $700.
• The base beneficiary premium — a national figure used to calculate the late-enrollment penalty — is $41.33. Actual plan premiums are set plan by plan.

Even if you have creditable retiree drug coverage, people with limited income and resources may still qualify for Extra Help with Medicare drug costs. It's worth checking.

Medigap timing matters too

If you ever think you might leave retiree coverage and want a Medigap policy instead, pay attention to timing. Medicare.gov notes that if you don't buy Medigap within 6 months of first having both Part A and Part B, you may not be able to buy a policy later, or you may pay more. Retiree coverage is not Medigap, and dropping retiree coverage later does not reset that 6-month window.

Medicare Advantage vs. Original Medicare with supplemental coverage

Some retirees weigh keeping retiree coverage behind Original Medicare against enrolling in a Medicare Advantage plan. Both paths have trade-offs. Original Medicare lets you see any provider that accepts Medicare nationwide, and pairing it with retiree coverage (or Medigap) can make out-of-pocket costs more predictable; however, you'd typically pay separately for drug coverage if it's not already included. Medicare Advantage plans bundle hospital, medical, and usually drug coverage and often include extras, but they use networks and prior authorization and are generally local in scope. There's no universally "better" choice — it depends on your doctors, your prescriptions, your travel, and your budget. And remember: enrolling in a Medicare Advantage plan may cause you to lose retiree coverage, so ask first.

Dates to circle

• Annual Enrollment (also called Open Enrollment) runs October 15 – December 7, 2026, with choices taking effect January 1, 2027.
• The Social Security Administration announced a 3.6% cost-of-living adjustment (COLA) on October 14, 2026, for benefits payable beginning January 2027.
• The 2027 Part B standard premium and deductible, and the 2027 IRMAA income brackets, have not yet been announced. CMS typically releases them in the fall.

If you're on Medicaid or get 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 join an integrated D-SNP in any month.

Where to go next

For official explanations, enrollment tools, and plan lookup, visit Medicare.gov or call 1-800-MEDICARE (1-800-633-4227), TTY 1-877-486-2048. And before you make any Medicare change that could affect retiree benefits, call your former employer or union's plan administrator first.