27.4 Medicare Part C: Medicare Advantage
Key Takeaways
- Medicare Advantage replaces Parts A and B through private plans approved by Medicare.
- Plan types include HMO, PPO, PFFS, SNP, and MSA designs.
- MA plans often include Part D and extra benefits like vision or dental.
- Members still pay the Part B premium and may have additional plan premiums.
- Enrollment requires Parts A and B and living in the plan's service area.
- Cost sharing and networks vary by plan and must follow Medicare rules.
Last updated: December 2025
Medicare Advantage (MA), also known as Part C, is an alternative way to receive Medicare benefits through private insurance companies approved by Medicare. These plans combine Part A and Part B coverage, and most include Part D prescription drug coverage (MA-PD plans).
Medicare Advantage Overview
What is Medicare Advantage?
| Feature | Description |
|---|---|
| Administration | Private insurance companies |
| Approval | Must be approved by CMS |
| Coverage | Must cover everything Original Medicare covers |
| Additional benefits | Often includes vision, dental, hearing, fitness |
| Out-of-pocket maximum | Required annual limit on spending |
Medicare Advantage vs. Original Medicare
| Factor | Original Medicare | Medicare Advantage |
|---|---|---|
| Administration | Federal government | Private insurers |
| Provider choice | Any Medicare provider | Usually network-based |
| Referrals | Not required | May be required (HMO) |
| Out-of-pocket max | None | Required |
| Prescription drugs | Separate Part D needed | Usually included |
| Additional benefits | Not included | Often included |
Key Point: To enroll in a Medicare Advantage plan, you must have BOTH Medicare Part A AND Part B and continue paying your Part B premium.
Types of Medicare Advantage Plans
Health Maintenance Organization (HMO)
| Feature | Details |
|---|---|
| Network | Must use plan's network providers |
| Primary care physician | Usually required |
| Referrals | Generally required for specialists |
| Out-of-network coverage | Usually none except emergencies |
| Cost | Typically lower premiums and copays |
Preferred Provider Organization (PPO)
| Feature | Details |
|---|---|
| Network | Has network but allows out-of-network |
| Primary care physician | Not required |
| Referrals | Not required for specialists |
| Out-of-network coverage | Covered at higher cost |
| Cost | Higher premiums than HMO |
Other MA Plan Types
| Plan Type | Description |
|---|---|
| Private Fee-for-Service (PFFS) | Plan determines payment to providers |
| Special Needs Plans (SNP) | For specific populations (dual-eligible, chronic conditions, institutional) |
| HMO Point-of-Service (HMO-POS) | HMO with some out-of-network coverage |
| Regional PPO | PPO covering entire region |
2025 Medicare Advantage Costs
Average MA Plan Costs
| Cost Type | 2025 Average |
|---|---|
| MA-PD premium (in addition to Part B) | $13.32/month |
| MA plans with $0 premium | 76% of enrollees |
| HMO average premium | $11/month |
| Local PPO average premium | $15/month |
| Regional PPO average premium | $75/month |
Maximum Out-of-Pocket Limits
| Coverage Type | 2025 Maximum |
|---|---|
| In-network only | Varies by plan |
| In-network + out-of-network | Higher limit |
| Required by Medicare | Yes (no limit in Original Medicare) |
Exam Tip: The out-of-pocket maximum is a key advantage of MA plans. Original Medicare has NO out-of-pocket limit—you pay 20% coinsurance indefinitely.
Additional Benefits in MA Plans
Commonly Included Benefits
| Benefit | Original Medicare | Many MA Plans |
|---|---|---|
| Routine dental | Not covered | Often included |
| Routine vision | Not covered | Often included |
| Hearing aids | Not covered | Often included |
| Fitness programs | Not covered | Often included (SilverSneakers) |
| Transportation | Not covered | Sometimes included |
| Over-the-counter allowance | Not covered | Sometimes included |
Mental Health Improvements in 2025
| Change | Description |
|---|---|
| Expanded providers | Marriage/family therapists and mental health counselors now covered |
| Intensive outpatient | New program bridging outpatient and hospital care |
| Network requirements | Behavioral health network expansion required |
Enrollment and Eligibility
Eligibility Requirements
| Requirement | Details |
|---|---|
| Part A enrollment | Must have Part A |
| Part B enrollment | Must have Part B |
| Continue Part B premium | Still pay $185.00/month (or IRMAA amount) |
| Service area | Must live in plan's service area |
| No ESRD (with exceptions) | Can enroll if develop ESRD while enrolled |
Enrollment Periods
| Period | Dates | Changes Allowed |
|---|---|---|
| Annual Enrollment Period (AEP) | Oct 15 - Dec 7 | Switch to/from MA, change MA plans |
| Medicare Advantage Open Enrollment (MA OEP) | Jan 1 - Mar 31 | Switch MA plans or return to Original Medicare |
| Initial Enrollment Period (IEP) | 7 months around 65th birthday | Initial enrollment in MA |
| Special Enrollment Period (SEP) | Varies | Qualifying life events |
Disenrollment
| Reason | Options |
|---|---|
| Move out of service area | Change plans or return to Original Medicare |
| Plan leaves Medicare | Automatic enrollment options provided |
| Dissatisfaction | Switch during AEP or MA OEP |
| Plan doesn't meet standards | May have SEP |
Key Point: During the Medicare Advantage Open Enrollment Period (Jan 1 - Mar 31), those already in an MA plan can switch to a different MA plan or return to Original Medicare and add a Part D plan.
Key Takeaways
- Medicare Advantage replaces Parts A and B through private plans approved by Medicare.
- Plan types include HMO, PPO, PFFS, SNP, and MSA designs.
- MA plans often include Part D and extra benefits like vision or dental.
- Members still pay the Part B premium and may have additional plan premiums.
- Enrollment requires Parts A and B and living in the plan's service area.
- Cost sharing and networks vary by plan and must follow Medicare rules.
Loading diagram...
Loading diagram...
Test Your Knowledge
Which of the following is required to enroll in a Medicare Advantage plan?
A
B
C
D
Test Your Knowledge
What is a key advantage of Medicare Advantage plans compared to Original Medicare?
A
B
C
D
Test Your Knowledge
During which period can a Medicare Advantage enrollee switch to a different MA plan or return to Original Medicare?
A
B
C
D