Short answer
Short answer
Most TRICARE-eligible military retirees should prepare for Medicare before age 65. If you qualify for premium-free Medicare Part A, you generally need both Part A and Part B to keep TRICARE and receive TRICARE For Life. TRICARE recommends enrolling in Part B no later than two months before turning 65 to help prevent a coverage gap.
Who this applies to
- Retired service members approaching age 65
- TRICARE-eligible spouses and survivors approaching age 65
- Caregivers helping a military retiree organize the transition
Important exceptions
- An active-duty sponsor can change when Part B is required.
- People who are not eligible for premium-free Part A need different documentation and should confirm their DEERS record.
- Medicare eligibility before age 65 follows different timing rules.
Six months before your 65th birthday
- Confirm that your name, birth date, address, and sponsor information are correct in DEERS.
- Create or review your Social Security account and learn whether Medicare enrollment will be automatic.
- List every current doctor, prescription, pharmacy, and source of coverage, including VA care and employer coverage.
- Ask whether a younger spouse or dependent will remain in a different TRICARE plan after your transition.
Three months before your birthday month
- Your seven-month Medicare Initial Enrollment Period generally begins three months before the month you turn 65.
- If you receive Social Security or Railroad Retirement benefits, review your Medicare card and effective dates when it arrives.
- If enrollment is not automatic, apply for Medicare Part A and Part B through Social Security.
- Keep copies of confirmations, notices, and the front and back of your Medicare card.
Two months before age 65
TRICARE advises people eligible for premium-free Part A to enroll in Part B no later than two months before turning 65. TFL begins when both Part A and Part B are effective; there is no separate TFL enrollment form.
- Check the Part A and Part B effective dates on your Medicare card.
- Confirm the Medicare information has reached DEERS.
- Do not cancel existing coverage until the replacement effective dates are confirmed.
During your birthday month
- Carry both your Medicare card and Uniformed Services ID card.
- Tell civilian providers that Medicare is generally primary and TFL is generally secondary when you are not on active duty.
- Review how prescriptions will be filled through the TRICARE pharmacy benefit, VA pharmacy, or another source.
- Check the first Medicare Summary Notice and TRICARE explanation of benefits for correct coordination.
The first 60 days after the transition
- Verify that claims cross over from Medicare to the TFL contractor when expected.
- Keep any bill that arrives before paying it; compare it with both payer notices first.
- Record the phone number, date, and reference number for every benefits call.
- Schedule a review if your doctors, prescriptions, travel, or household coverage changed.
Frequently asked questions
Do I enroll separately in TRICARE For Life?
No. TFL coverage is generally automatic when you are TRICARE-eligible, registered in DEERS, and have Medicare Part A and Part B.
What happens to a spouse younger than 65?
A younger eligible spouse generally remains eligible for an age-appropriate TRICARE plan until becoming Medicare-eligible. Confirm the household record and enrollment directly with TRICARE.
Do I need Medicare Part D for TFL?
TRICARE states that Part D is not required to keep the TRICARE pharmacy benefit. Compare any optional Part D coverage against your prescriptions and other coverage before enrolling.
Reviewed by
Patrick Riley
Disabled Veteran & Healthcare Consultant. Former U.S. Army hospital administrator. Ten years as a civilian global healthcare insurance consultant. Former Manager of Veteran Affairs for a national Veteran personal care services company.
Reviewed for accuracy on October 12, 2026
Official sources
Related guides
Do Veterans Need Medicare Part B?
When Veterans, TRICARE For Life beneficiaries, and VA health care users need Medicare Part B—and the exceptions to check before deciding.
Medicare Advantage and TRICARE For Life
How Medicare Advantage works with TRICARE For Life, including networks, claims, extra benefits, and questions to ask before enrolling.
Who Pays First? Medicare, TRICARE For Life, and VA
A practical comparison of who generally pays first for civilian care, VA-authorized care, prescriptions, emergencies, and overseas services.
Licensed insurance agent. Veteran Medicare Solutions is a private company. It is not affiliated with, endorsed by, or acting on behalf of the U.S. government, the federal Medicare program, the Department of Veterans Affairs, or the Department of Defense. This guide is general education, not a coverage determination or legal advice. Confirm your own eligibility and effective dates with the applicable program.