Who pays first depends on the program and whether you are still working. This is a checklist — not a payment decision.

I also have:

• VA: Medicare does not pay for care at a VA facility. VA does not replace Part B for non-VA doctors. You can have both.
• TRICARE for Life: you generally must have Part A and Part B. Medicare pays first; TRICARE pays second on covered services.
• Active-duty TRICARE (or a family member on active duty): TRICARE is often first. Do not drop Part B without asking TRICARE.
• FEHB while you or a spouse is still working (larger employer): FEHB is often first, Medicare second.
• FEHB as a retiree: Medicare is usually first, FEHB second. Keep Part B unless the benefits office says otherwise in writing.
• I will not skip Part B only because I have VA, TRICARE, or FEHB — I will confirm with that program and Social Security.