Tricare for Life and Medicare Advantage cannot be used at the same time
If you are a military retiree or survivor covered by Tricare for Life, you cannot also enroll in a Medicare Advantage plan. Tricare for Life is a separate military health program that works alongside Original Medicare (Parts A and B). Medicare Advantage is a private insurance alternative to Original Medicare. You must choose one path or the other.
This matters because the two programs have different networks, different out-of-pocket costs, and different rules about which doctors you can see. Understanding which one fits your situation will help you avoid coverage gaps and unexpected bills.
Key Takeaways
- Tricare for Life is a military health benefit that covers people age 65 and older who are also enrolled in Medicare Parts A and B; Medicare Advantage is a private insurance plan that replaces Original Medicare entirely.
- You cannot hold both Tricare for Life and a Medicare Advantage plan at the same time — you must choose one.
- Tricare for Life works with Original Medicare to cover costs that Medicare does not pay, while Medicare Advantage has its own network and cost structure.
- If you drop Tricare for Life to join Medicare Advantage, you cannot get Tricare for Life back later, so the decision should be made carefully.
- Military retirees and survivors should contact their Tricare regional office or the Defense Enrollment may be able to access Reporting System (DEERS) before making any changes to their coverage.
How Tricare for Life works with Original Medicare
Tricare for Life is a secondary payer to Medicare. This means Medicare processes your claim first, and then Tricare for Life covers much of what Medicare does not pay. You must be enrolled in both Medicare Part A (hospital insurance) and Medicare Part B (medical insurance) to use Tricare for Life. There is no monthly premium for Tricare for Life itself, though you pay the standard Medicare Part B premium.
When you see a doctor or go to the hospital, you show both your Medicare card and your Tricare for Life card. The provider bills Medicare first. Medicare pays its share, and then Tricare for Life typically covers the remaining balance, including the Part B deductible and coinsurance. This two-step process means you usually have very low out-of-pocket costs.
Tricare for Life covers care at any Medicare-participating provider in the United States. You do not have to choose a primary care doctor or stay within a network. This gives you flexibility to see any doctor who accepts Medicare.
How Medicare Advantage differs from Tricare for Life
Medicare Advantage is a private insurance plan run by insurance companies under contract with Medicare. It replaces Original Medicare entirely — you do not use Medicare Part A or Part B when you are enrolled in Medicare Advantage. Instead, the Medicare Advantage plan becomes your primary insurance.
Medicare Advantage plans have networks of doctors and hospitals. You usually must see doctors within that network, or you pay higher out-of-pocket costs. Many plans require you to choose a primary care doctor who coordinates your care. Plans often include prescription drug coverage (Part D) built in, whereas with Original Medicare and Tricare for Life, you need a separate Part D plan.
Medicare Advantage plans have annual out-of-pocket maximums, which means your costs are capped each year. Tricare for Life has no annual out-of-pocket maximum, though your actual costs are typically much lower because Tricare covers most of what Medicare leaves unpaid.
Why you cannot have both at the same time
The two programs are designed as separate paths to coverage. Tricare for Life is a military benefit that assumes you are using Original Medicare as your primary insurance. Medicare Advantage is a complete replacement for Original Medicare. If you enrolled in Medicare Advantage, you would no longer have Original Medicare, so Tricare for Life would have nothing to work with as a secondary payer.
Federal rules do not allow you to hold a Medicare Advantage plan and Tricare for Life simultaneously. If you want to switch from one to the other, you must disenroll from the first before enrolling in the second.
What happens if you drop Tricare for Life to join Medicare Advantage
If you decide to leave Tricare for Life and enroll in a Medicare Advantage plan, you should know that you cannot return to Tricare for Life later. This is a permanent decision. Once you drop Tricare for Life, your only option to get military health coverage again is to enroll in Tricare Select (a different military plan with higher out-of-pocket costs) or to wait until you are no longer may be able to access for Tricare.
Before you make this change, compare the costs and networks carefully. Look at which doctors you see regularly and whether they are in the Medicare Advantage plan's network. Check the plan's formulary to see if your medications are covered. Calculate your expected out-of-pocket costs under both options for a typical year.
You can switch from Tricare for Life to Medicare Advantage during the Medicare Annual Enrollment Period (October 15 to December 7 each year). Some life events, such as moving out of your Tricare region, may allow you to make changes outside this window. Contact your Tricare regional office to confirm your specific situation.
What happens if you drop Medicare Advantage to return to Tricare for Life
If you enroll in Medicare Advantage and later want to go back to Tricare for Life, you cannot. Once you leave Tricare for Life, that door closes. You would need to stay in Medicare Advantage or switch to Tricare Select, which is a managed care plan with copays and deductibles.
This is why the initial decision matters so much. If you are unsure whether Medicare Advantage is right for you, it may be safer to stay with Tricare for Life, since you can always try Medicare Advantage later but cannot return to Tricare for Life once you leave.
Questions to ask your Tricare regional office before switching
Before you make any change to your coverage, contact your Tricare regional office or call the Tricare customer service line. Ask whether your current doctors are in the Medicare Advantage plan's network. Ask what your out-of-pocket costs would be for your regular medications and routine care under the Medicare Advantage plan compared to Tricare for Life.
Ask whether you would lose any coverage if you switch. Ask about the specific rules for your region, since Tricare coverage varies by location. Ask for a written summary of the differences so you can review it at home. The Tricare regional office can also tell you whether any life events (such as moving) might affect your options.
Frequently Asked Questions
Can I use Tricare for Life if I am also enrolled in a Medicare Advantage plan?
No. Federal rules do not allow you to hold both at the same time. You must choose one or the other. If you are enrolled in Medicare Advantage, you cannot also use Tricare for Life.
If I leave Tricare for Life to try Medicare Advantage, can I go back to Tricare for Life later?
No. Once you disenroll from Tricare for Life, you cannot return to it. This is a permanent decision. You would need to stay in Medicare Advantage or switch to Tricare Select, which has higher out-of-pocket costs than Tricare for Life.
Do I need to enroll in a Part D prescription drug plan if I have Tricare for Life?
Yes. Tricare for Life does not include prescription drug coverage. You must enroll in a separate Medicare Part D plan. If you do not enroll during your initial may be able to access period, you may face a late enrollment penalty.
What is the difference between Tricare for Life and Tricare Select?
Tricare for Life is available only to people age 65 and older who are enrolled in Medicare Parts A and B. It has no monthly premium and very low out-of-pocket costs. Tricare Select is available to all military retirees and survivors and has monthly premiums and copays. If you leave Tricare for Life, you cannot return to it, but you can enroll in Tricare Select.
How do I know which option costs less for my situation?
Contact your Tricare regional office and ask them to compare the costs. Tell them which doctors you see, which medications you take, and how often you use health care. Ask for a written estimate of your annual out-of-pocket costs under both Tricare for Life and the Medicare Advantage plan you are considering. This will give you a real number to compare.