Medicare With Job, VA or TRICARE Coverage: Who Pays First

Many people reach Medicare age while they still have other health coverage: a plan from their job or a spouse's job, retiree benefits, VA health care, TRICARE or Medicaid. The questions are always the same. Do I need Medicare now, and which coverage pays first?

The answers depend on the type of coverage, whether it comes from current work, and sometimes how many people the employer has. This guide walks through the most common combinations, using the rules Medicare and the agencies involved publish.

This is general information, not insurance, legal, tax or benefits advice. This independent site isn't connected with Medicare, CMS, the VA or TRICARE. Rules can depend on details of your plan, so confirm with your benefits administrator. For free one-on-one help, contact your State Health Insurance Assistance Program (SHIP) or call 1-800-MEDICARE (1-800-633-4227).

Primary and secondary payers

When you have Medicare and other insurance, one pays first and the other pays second. Medicare.gov explains that the primary payer pays up to the limits of its coverage. The secondary payer pays only if there are costs the primary payer didn't cover, and the Medicare & You 2027 handbook notes it might not pay all of them.

That's why the order matters. If Medicare is supposed to pay first and you don't have Part B, your other plan may pay very little for doctor and outpatient care. The 2027 handbook warns that if your group health plan or retiree coverage pays second, you'll likely need Part B before it will pay.

Medicare.gov also suggests telling your doctors and other providers about all your coverage so bills go to the right payer.

Coverage from a current job

For people 65 or older with group health coverage from their own or a spouse's current employment, Medicare.gov's who-pays-first guidance (checked October 2026) says:

• If the employer has 20 or more employees, the group health plan pays first and Medicare pays second.
• If the employer has fewer than 20 employees, Medicare pays first. The order can be different if the employer is part of a multi-employer plan.

For people under 65 who have Medicare because of a disability, the same guidance uses a 100-employee threshold. With an employer of 100 or more employees, the group plan pays first. People with End-Stage Renal Disease follow a different rule. The 2027 handbook says the group health plan pays first during the first 30 months of Medicare eligibility.

If your job-based plan pays first, you may be able to delay Part B without a penalty. Medicare.gov's working-past-65 page says that once you stop working or lose that coverage, whichever comes first, you get an 8-month Special Enrollment Period to sign up for Part B. If you qualify for premium-free Part A, Medicare.gov says you can sign up for it at 65 or any time later. Ask the employer whether you need Part A and Part B, because Medicare.gov warns your job-based insurance might not cover your costs if you don't sign up.

If you contribute to a Health Savings Account (HSA), check the timing. The 2027 handbook says you can't contribute to an HSA after you have Medicare, and premium-free Part A can be backdated up to 6 months when you sign up after 65. Medicare.gov suggests that you and your employer stop contributing 6 months before you retire or apply for Social Security benefits.

Coverage that doesn't count as "current employment"

This is where people get caught. The Medicare & You 2027 handbook says these don't count as active employer coverage for the Part B Special Enrollment Period:

• COBRA or similar continuation coverage
• Retiree coverage
• VA coverage
• Individual coverage, including Marketplace plans
• Former employer coverage through severance or a layoff

With retiree coverage, Medicare.gov says Medicare pays first and the retiree plan pays second. With COBRA, Medicare pays first if you have Medicare because you're 65 or older, and the 2027 handbook says COBRA may pay only a small portion of your medical costs. Medicare.gov's advice is not to wait for COBRA to end before signing up for Part B, because COBRA doesn't extend your sign-up window.

VA health care and Medicare

VA benefits and Medicare don't coordinate the way two insurance plans do. Medicare.gov explains that you can get treatment under either program, but generally they can't pay for the same service. Each time you get care, you choose which benefit to use. The VA pays for VA-authorized care at VA or non-VA facilities. Medicare pays for Medicare-covered items and services. VA.gov notes that the VA doesn't bill Medicare.

VA.gov encourages veterans enrolled in VA health care to sign up for Medicare when they turn 65. It points out that Medicare gives you more options at non-VA hospitals and doctors, and that VA funding could change in the future. It also warns that if you delay Part B and sign up later, you'll pay a penalty that grows the longer you wait.

For drugs, the 2027 handbook says VA drug coverage can count as creditable, so you can delay Part D without a penalty. VA.gov says the 63-day rule applies if you later lose VA coverage. If you join a Part D plan, Medicare.gov says you can't use both types of coverage for the same drug at the same time.

TRICARE and TRICARE For Life

TRICARE has a firmer rule. The Medicare & You 2027 handbook says that if you have TRICARE, you generally must sign up for Part A and Part B when you're first eligible to keep it. Active-duty service members and their family members are an exception for Part B.

Once you have both parts, TRICARE For Life (TFL) works as wraparound coverage. TRICARE's own site says TFL coverage is automatic if you're TRICARE-eligible and have Medicare Part A and Part B. There's no TFL enrollment fee, though you pay your Medicare premiums. For care in the U.S. and U.S. territories, Medicare pays first and TRICARE pays second, and TRICARE says you'll generally have no out-of-pocket costs for services both programs cover. Medicare.gov notes that TRICARE pays first if you're on active duty, and TRICARE pays for care at military hospitals and clinics.

For prescriptions, Medicare.gov says you don't need a Medicare drug plan if you have TRICARE. If you join one anyway, it pays first and TRICARE pays second.

Medicaid and Medicare together

If you qualify for both programs, you're "dually eligible." Medicare.gov says Medicare pays first for Medicare-covered services, and Medicaid pays last, after Medicare and any other insurance. Medicaid may also pay your Part B premium and some of your Medicare costs. With full Medicaid, you automatically qualify for Extra Help with drug costs.

Practical steps

• Before you turn 65, ask your benefits administrator in writing whether your plan will pay first or second once you're eligible for Medicare.
• Ask whether your drug coverage is creditable, and keep the yearly notice.
• Before joining a Medicare Advantage or Part D plan, ask whether doing so would end your employer or retiree coverage.
• Report changes to other coverage to Medicare's Benefits Coordination & Recovery Center at 1-855-798-2627 (TTY 1-855-797-2627).

Key takeaways

• Primary insurance pays first, secondary pays only what's left, and secondary coverage often expects you to have Part B.
• With your or your spouse's current-job coverage at 65 or older, Medicare.gov's 2026 guidance says employer size decides the order: 20 or more employees means the job plan pays first.
• COBRA, retiree coverage, VA coverage and Marketplace plans don't let you delay Part B without risking a penalty.
• VA and Medicare don't pay for the same care. You choose for each visit, and the VA encourages enrolling in Medicare.
• TRICARE generally requires Part A and Part B, and TRICARE For Life then pays second after Medicare.

Sources

• Medicare.gov, Who pays first?
• Medicare.gov, Working past 65
• Centers for Medicare & Medicaid Services, Medicare & You 2027 (official U.S. government Medicare handbook)
• U.S. Department of Veterans Affairs, VA health care and other insurance
• TRICARE (Defense Health Agency), TRICARE For Life
• Medicare.gov, Medicaid