Beneficiaries Using TRICARE Retired Reserve
If entitled to Medicare Part A, you're not required to have Medicare Part B to purchase TRICARE Retired Reserve.
Even though you're not required to have Medicare Part B, we strongly encourage you to sign up for Part B when you are first eligible. If you don't you may be required to pay the Medicare Part B Late Enrollment PenaltyYour monthly premium for Part B may go up 10% for each full 12-month period that you could have had Part B, but didn't sign up for it..
Learn more about TRICARE Retired Reserve