16.2 Medicare Part C (Advantage) and Part D (Drug)
Key Takeaways
- Part C (Medicare Advantage) delivers Part A and B through private plans and requires enrollment in both A and B.
- Advantage plans add an annual out-of-pocket maximum that Original Medicare lacks, and often bundle Part D.
- Part D is voluntary drug coverage with a $2,000 out-of-pocket cap; the donut hole was eliminated in 2025.
- A 63+ day gap in creditable drug coverage triggers a permanent Part D late-enrollment penalty.
- AEP runs October 15-December 7, and agents must follow Scope of Appointment and no-unsolicited-contact marketing rules.
Part C: Medicare Advantage
Part C, marketed as Medicare Advantage (MA), lets private insurers contract with CMS to deliver all Part A and Part B benefits through a single plan. To enroll, a person must already have both Part A and Part B. Advantage plans must cover everything Original Medicare covers and usually add extras such as dental, vision, hearing, and prescription drugs (an MA-PD plan bundles Part D).
Unlike Original Medicare, MA plans have an annual out-of-pocket maximum for in-network Part A and B services, a key selling point because Original Medicare has none.
Common Advantage Plan Types
| Plan type | Network rules | Referrals |
|---|---|---|
| HMO | In-network only (except emergencies) | Usually required |
| PPO | In and out of network (higher out-of-network cost) | Not required |
| PFFS (Private Fee-for-Service) | Providers must accept plan terms | Not required |
| SNP (Special Needs Plan) | Limited to specific groups (e.g., dual-eligible, chronic conditions) | Varies |
MA plans receive a fixed monthly capitated payment from CMS per enrollee. The beneficiary still owes the Part B premium and may owe an additional plan premium, though many MA plans advertise $0 plan premium.
Part D: Prescription Drug Coverage
Part D is voluntary outpatient prescription drug coverage offered through private plans, either standalone (PDP) or bundled inside Advantage (MA-PD). Plans use a formulary, a tiered list of covered drugs. Beneficiaries with both Medicare and full Medicaid get extra help and lower costs.
Part D Benefit Phases (2026)
- Deductible phase: beneficiary pays full cost up to the deductible (max ~$590).
- Initial coverage: beneficiary pays cost-sharing until reaching the new out-of-pocket cap of $2,000.
- Catastrophic coverage: once the $2,000 out-of-pocket cap is hit, the beneficiary pays $0 for covered drugs the rest of the year.
The old coverage gap ("donut hole") was eliminated by the Inflation Reduction Act starting in 2025. Watch for outdated exam answers still referencing the donut hole.
Worked Part D Cost Example
A beneficiary has a $590 deductible, then enters initial coverage paying 25% coinsurance on drugs. Suppose total drug cost after the deductible is $5,640 before the cap. At 25%, the beneficiary's share would be $1,410; combined with the deductible ($590) that reaches the $2,000 out-of-pocket cap. From that point forward the beneficiary pays $0.
This hard $2,000 cap is the modern Part D rule examiners now test, replacing the donut-hole math used before 2025.
Part D Late-Enrollment Penalty and Creditable Coverage
If a beneficiary goes 63 or more consecutive days without creditable drug coverage (coverage at least as good as Part D) after their IEP, a permanent late-enrollment penalty is added to the Part D premium. The penalty equals roughly 1% of the national base beneficiary premium for each full month without creditable coverage.
Enrollment Timing for C and D
- Annual Election Period (AEP): October 15-December 7 to join, switch, or drop MA and Part D plans for the next year.
- Medicare Advantage Open Enrollment: January 1-March 31 to switch MA plans once or return to Original Medicare.
- Marketing rules: agents may not make unsolicited contact, cannot use door-to-door or cold calls, and must obtain a Scope of Appointment before discussing MA/PDP products.
Under the current Part D structure, what happens once a beneficiary's out-of-pocket drug spending reaches the $2,000 cap?
Which statement about Medicare Advantage (Part C) is correct?
Key Takeaways
- Part C (Advantage) bundles A and B through private plans, requires both A and B, and adds an annual out-of-pocket cap.
- Plan types: HMO, PPO, PFFS, SNP; the Part B premium is still owed.
- Part D is voluntary drug coverage with a $2,000 out-of-pocket cap and no donut hole since 2025.
- Going 63+ days without creditable coverage triggers a permanent Part D penalty.
- AEP is Oct 15-Dec 7; agents must follow Scope of Appointment and no-unsolicited-contact rules.
Advantage Plan Network and Bundling Rules
Medicare Advantage (Part C) plans are offered by private insurers approved by CMS and must cover at least everything Original Medicare (A and B) covers, usually bundling Part D drugs and extras (dental, vision, hearing). Enrollees pay Part B premium plus any plan premium and use the plan's network (HMO/PPO style). Unlike Original Medicare, Advantage plans include an annual out-of-pocket maximum. A beneficiary cannot have both a Medicare Advantage plan and a Medigap policy.
Creditable Coverage and the Part D Penalty
If a beneficiary goes 63+ continuous days without Part D or other creditable drug coverage after initial eligibility, a permanent late-enrollment penalty is added to the Part D premium (roughly 1% of the national base premium per month of delay). Employer or VA drug coverage that is at least as good as Part D counts as creditable, avoiding the penalty. This mirrors the Part B penalty concept but uses the 63-day window.
A beneficiary enrolls in a Medicare Advantage (Part C) plan. Which statement is correct?
Enrollment Windows for Parts C and D
Beneficiaries elect Parts C and D during specific windows. The Initial Enrollment Period (IEP) is the 7-month span around the 65th birthday. The Annual Election Period (AEP), October 15 to December 7, lets beneficiaries join, switch, or drop Advantage and Part D plans for the following year. The Medicare Advantage Open Enrollment Period (MA-OEP), January 1 to March 31, allows one switch out of an Advantage plan. Missing these windows without a Special Enrollment Period can leave a beneficiary locked out until the next AEP and exposed to late penalties.