Medicare Advantage (Part C) plans bundle hospital, medical, and usually prescription drug coverage (MA-PD) into a single plan from a private insurer. Each MA plan has its own formulary, which must meet CMS minimum coverage standards. Over 50% of Medicare beneficiaries are now enrolled in Medicare Advantage, making these formularies critical to understanding senior drug coverage.
Key Facts
Check Your Specific Plan's Formulary
Coverage varies by plan. Use our formulary checker tool to look up your exact copay and restrictions.
Open Formulary CheckerSources and standards behind this page
Drug coverage in the United States is governed by published rules rather than by any one insurer's summary, and the sources below are the primary ones. They are linked so a reader can check a claim without taking this page's word for it.
- FDA Orange Book publishes the therapeutic-equivalence ratings that decide whether a generic may be substituted for a brand-name drug.
- FDA generic drug facts sets out what "generic equivalent" means and what a manufacturer must prove.
- CMS prescription drug coverage defines the rules a Medicare drug plan formulary must follow and how it may change mid-year.
- Medicare.gov drug coverage (Part D) states what a Part D plan is required to offer a member.
- CMS prescription drug appeals documents the coverage-determination and exception process when a drug is denied.
This page describes how coverage and formularies work. It is not medical advice, and a reader's own plan documents and prescriber decide what applies to them.
Frequently Asked Questions
Most Medicare Advantage plans (called MA-PD plans) include Part D prescription drug coverage. However, some MA-only plans do not include drug coverage. If you choose an MA-only plan, you would need a separate standalone Part D plan. Check the plan details before enrolling.
Both must meet CMS minimum coverage requirements. However, MA plans may have different formularies, preferred pharmacies, and copay structures compared to standalone Part D plans. Some MA plans negotiate exclusive deals with pharmacy chains. Compare both options using the Medicare Plan Finder.
MA plans have pharmacy networks with preferred and standard pharmacies. You will pay less at preferred pharmacies. Out-of-network pharmacies may not be covered except in emergencies. Many MA plans include mail-order pharmacy options for maintenance medications at reduced costs.
Related Resources
- Medicare Part D Formulary 2026
- Humana Formulary 2026
- UnitedHealthcare Formulary 2026
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