Medicare Advantage (Part C) plans from carriers such as UnitedHealthcare, Humana, Aetna, Kaiser Permanente, and many Blues must include an annual maximum out-of-pocket (MOOP) for covered Part A and Part B services. Once you hit the MOOP through deductibles, copays, and coinsurance the plan counts, the plan generally pays 100% of further covered, in-network (and, for some PPOs, certain out-of-network) Medicare services for the rest of that calendar year. General OOP vocabulary: Out-of-pocket maximum. Original Medicare plus Medigap is a different stack: What is Medigap.
CMS sets yearly limits on how high an MA plan’s MOOP may be; individual plans publish their own (often lower) in-network and, for PPOs, combined or OON caps in the Evidence of Coverage (EOC) and Summary of Benefits.
What typically counts toward MA MOOP
| Usually counts (confirm EOC) | Usually does not count |
|---|---|
| In-network Part A/B deductibles, copays, coinsurance the plan applies | Monthly plan premium (and usually Part B premium you still pay to Medicare) |
| Many plan-approved specialist, hospital, and outpatient cost-shares | Part D prescription cost-sharing (drugs often have a separate Rx deductible / coverage gap / IRMAA story) |
| Some PPO out-of-network Medicare services up to the OON or combined MOOP | Non-covered services, cosmetic care, private-duty nursing |
| Care outside the plan’s rules (no prior auth when required, non-network HMOs) | |
| Many dental / vision / hearing rider charges beyond the medical MOOP bucket |
Always read the plan’s in-network MOOP vs out-of-network / combined MOOP. An HMO may offer little or no OON coverage except emergencies; a PPO’s OON MOOP can be much higher.
MOOP vs Medigap vs COBRA timing
- MA MOOP caps counted medical cost-sharing inside that Advantage plan for the year.
- Original Medicare alone has no annual OOP cap like MA; many people add Medigap for predictable gaps (What is Medigap).
- Leaving employer coverage may involve COBRA election windows before Medicare choices settle (COBRA health coverage; COBRA election deadline.
Premium tax and IRMAA issues are separate from MOOP math; ordinary return flow: Filing taxes for beginners.
Worked example: $4,500 in-network MOOP
Sam enrolls in a Humana-style MA-PPO (illustrative numbers, not a quote):
- In-network MOOP: $4,500
- Out-of-network MOOP: $10,000
- Plan premium: $45/mo (does not count toward MOOP)
- Part B premium paid to Medicare: continues (does not count)
Year events (all in-network, prior auth followed):
- Outpatient surgery cost-share: $1,800
- Specialist and imaging copays: $700
- Short inpatient stay coinsurance: $2,000
- Running counted total: $4,500 → MOOP hit
- Later covered cardiology visits that year: plan pays 100% of allowed in-network amounts
Sam’s $45/mo plan premium and Part B premium still continue. A $200/month Part D specialty drug spend does not automatically fall under the $4,500 medical MOOP - Sam tracks the drug plan’s own rules. An out-of-network elective procedure could bill against the $10,000 OON MOOP instead of the in-network cap. EOB literacy: Medical bills and insurance. Deductible building blocks on non-Medicare plans still help vocabulary: Health insurance deductibles.
What MOOP does not fix
- Choosing a narrow network that excludes your oncologist
- Surprise bills for non-covered or private-contract services
- Drug costs carved into Part D
- Skipping prior authorization and owing full denied amounts
- Assuming last year’s MOOP equals this year’s CMS-capped or plan-set figure
Checklist
- Circle in-network MOOP and any OON / combined MOOP on the Summary of Benefits.
- Confirm whether your doctors and hospital are in-network for that specific contract.
- Ask what counts: ER, Rx (usually separate), DME, mental health.
- Budget premiums separately - they rarely reduce MOOP.
- After big claims, match EOBs to the plan’s accumulator.
- At Annual Enrollment, compare premium + MOOP + drug package, not premium alone.
Part D stages and the old donut hole are separate from medical MOOP: Medicare Part D donut hole basics.
IRMAA income-related Part B/D premium surcharges (separate from MOOP): Medicare IRMAA basics.
Part B/D late-enrollment penalties raise premiums; they do not change MOOP math: Medicare late enrollment penalty basics.
Original Medicare Part B excess charges (Medigap territory, not Advantage MOOP): Part B excess charge basics.
Original Medicare Part B deductible math (different from Advantage MOOP): Medicare Part B deductible basics.
Original Medicare Part A uses benefit periods instead of Advantage MOOP math: Medicare Part A benefit period basics.
Original Medicare observation vs inpatient (different from Advantage inpatient cost-sharing): Observation status vs inpatient basics.
CMS Medicare Advantage star ratings when comparing plans beside MOOP: Medicare Advantage star ratings basics.
Original Medicare outpatient therapy thresholds / KX (different from Advantage visit caps and MOOP): Medicare outpatient therapy threshold basics.
Educational only. Not insurance, tax, or legal advice. Not a plan recommendation. Medicare Advantage MOOP rules and CMS limits change by year and contract; confirm with Medicare.gov, your plan’s Evidence of Coverage, and your state SHIP program.