Medicare Part D Explained: Prescription Drug Coverage
What is Medicare Part D?
Medicare Part D is the optional prescription drug coverage program for Medicare beneficiaries. It is offered through private insurance companies approved by Medicare.
How Part D Works
The Four Coverage Phases
1. Deductible Phase
You pay full price until you meet the annual deductible (up to $590 in 2026). Some plans have $0 deductibles.
2. Initial Coverage Phase
After the deductible, you pay copays or coinsurance. The plan covers the rest until combined spending reaches $5,030.
3. Coverage Gap (Donut Hole)
After hitting the initial coverage limit, you enter the coverage gap. Thanks to the Inflation Reduction Act, out-of-pocket costs for brand-name drugs in the gap have been significantly reduced.
4. Catastrophic Coverage
After $2,000 in true out-of-pocket costs, you pay nothing for the rest of the year under the new IRA provisions.
Key Enrollment Dates
- Initial Enrollment: 3 months before to 3 months after turning 65
- Annual Open Enrollment: October 15 - December 7
- Late enrollment penalty: 1% per month for each month you delay after initial eligibility
Choosing a Plan
When comparing Part D plans, consider:
- Monthly premium - ranges from $0 to $100+
- Deductible - $0 to $590
- Formulary - make sure your drugs are covered
- Tier placement - lower tiers mean lower copays
- Pharmacy network - preferred pharmacies offer lower costs
Saving Money on Part D
- Use generic drugs when available
- Ask about therapeutic alternatives on a lower tier
- Use preferred pharmacies in your plan's network
- Consider Extra Help (LIS) if you have limited income
- Review and switch plans annually during open enrollment
Important: Copay Card Restrictions
Federal law prohibits Medicare beneficiaries from using manufacturer copay cards. However, many manufacturers offer separate Patient Assistance Programs for Medicare patients.
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