Glossary
MOOP (Maximum Out-of-Pocket)
The yearly cap on what you'll spend on covered Medicare Advantage services — Original Medicare has no MOOP.
Also known as: Maximum Out-of-Pocket, annual out-of-pocket maximum
Quick answer
Every Medicare Advantage plan has an annual maximum out-of-pocket (MOOP) limit for in-network covered services. Once you hit it, the plan pays 100% for the rest of the year.
Why it matters
Original Medicare has no out-of-pocket cap — TFL is what protects you from that. Under MA, the plan's MOOP is your safety net (with TFL still wrapping around copays).
When you'll encounter it
When comparing MA plans.
Impact on Medicare
N/A — Original Medicare has no MOOP.
Impact on TRICARE For Life
On Original Medicare, TFL acts as your de-facto MOOP by covering nearly all Medicare cost-shares.
Common misconceptions
- "MOOP includes my Part B premium." — It does not. Premiums are separate.
Continue learning
— suggested by the knowledge graph- Medicare Advantage for veterans: when it makes sense and when it doesn'tCarrier-neutral education on Medicare Advantage (Part C) for retired military — including how MA changes the role of TFL.
- Understanding Original Medicare (Parts A & B) for veteransExactly what Part A and Part B cover, what they cost in 2026, and why both are required to keep TRICARE For Life.
- Enrolling in Medicare: timing, methods, and the military-specific rulesWhen and how to sign up for Medicare Parts A and B — and the timing that protects your TRICARE For Life activation.
- Part B GivebackA Medicare Advantage plan benefit that reimburses part of your Part B premium, increasing your Social Security check.
- AEP & OEP (Election Periods)AEP (Oct 15 – Dec 7) is when you can join, switch, or drop MA plans. OEP (Jan 1 – Mar 31) lets you change MA plans once.
- Annual Election Period (AEP)October 15 – December 7 each year — the main window to join, switch, or drop a Medicare Advantage or Part D plan, with coverage starting January 1.
- Balance BillingThe practice of a provider billing you for the difference between their charge and what insurance approved.
- Benefit Period (Part A)The Part A timeframe used to measure hospital deductibles and coinsurance — it resets after 60 days out of the hospital.
- Billing ErrorsMistakes — accidental or intentional — on Medicare or TFL claims, ranging from duplicate charges to outright fraud.
- Brand-Name DrugsFDA-approved drugs sold under a manufacturer's proprietary name — middle copay tier on the TRICARE formulary.
- ClaimA formal request to an insurer for payment of a covered service.
- How much does Medicare Part B cost?Most people pay the standard Part B premium (roughly $202.90/month in 2026). Higher-income retirees pay IRMAA on top. Lower-income retirees may qualify for help paying it.
- Will I lose TRICARE For Life if I join Medicare Advantage?No. As long as you keep Medicare Part B, TFL stays. Inside an MA plan, MA becomes primary and TFL becomes a secondary wraparound for in-network MA cost-shares.
- How do I decide between Medicare Advantage and just Original Medicare + TFL?Stay with Original Medicare + TFL if you want maximum provider choice and travel often. Consider MA if you want a Part B giveback, dental/vision/hearing add-ons, and your doctors are in network.
- Can I leave Medicare Advantage and go back to Original Medicare + TFL?Yes, during the Annual Enrollment Period (Oct 15 – Dec 7) or the Medicare Advantage Open Enrollment Period (Jan 1 – Mar 31). TFL is waiting whenever you return.
- What is a 'veteran' Medicare Advantage plan?A standard Medicare Advantage plan that's marketed to military retirees. The plan itself isn't different by law — but the carriers package giveback and supplemental benefits that pair well with TFL.
Related glossary terms
Related Official Resources
Continue learning straight from the source. Every link below goes to an official government or DoD resource.
Last reviewed January 2026 against the 2026 Medicare & You and TRICARE For Life handbooks.