Medicare planning · Reviewed September 22, 2026

Medicare Part D Costs 2027: Premiums, Bids and Enrollment Guide

Answer first: CMS reported a 2027 Part D base beneficiary premium of $41.33 and a national average monthly bid amount of $296.05. Those are benchmarks, not a promise of the premium you will pay. Your actual cost depends on the plan, drugs, pharmacy, county and income-related adjustments.

What the 2027 figures mean

The base beneficiary premium is a national reference used in the Part D program. The national average bid amount is a separate benchmark reflecting plan bids before the final amount a beneficiary sees. Neither number replaces a plan-specific comparison. Two plans in the same ZIP code can have different premiums, formularies, deductibles and pharmacy pricing.

What to compare before enrolling

• Monthly premium and annual deductible.
• Whether each prescription is covered and which tier it occupies.
• Preferred pharmacies and mail-order pricing.
• Prior authorization, step therapy and quantity limits.
• Estimated annual cost, not just the premium.
• Whether your doctors and pharmacies remain convenient.

Open Enrollment checklist

Medicare Open Enrollment is the practical moment for many beneficiaries to review Part D choices for the following year. Start with a complete list of medications, strengths and monthly quantities. Enter that list into the official Medicare Plan Compare tool, then save the plan’s evidence of coverage and pharmacy assumptions. A plan that is cheapest for one drug list may be expensive after a prescription changes.

Do not wait until the final day if you need help. Confirm whether your current plan is changing its formulary, premium or preferred-pharmacy network. If you receive Extra Help or another assistance benefit, verify how a plan change affects your costs.

Why the premium headline can be misleading

A low premium can come with a higher deductible, restrictive formulary or unfavorable pharmacy tier. A higher premium can reduce total annual cost for a person taking several expensive medicines. Compare the total estimated annual cost and coverage rules. Also remember that Part D is only one part of a larger Medicare budget that may include Part B, Medigap or Medicare Advantage costs.

Income-related adjustments may affect some higher-income beneficiaries. The adjustment is based on rules and information that can lag your current income, so review official notices and appeal rights if a qualifying life event materially changed your finances.

Connect the decision to your household budget

Use the site’s budget calculator to reserve room for premiums, prescriptions and irregular medical expenses. If you are coordinating Medicare with retirement income, pair that estimate with the retirement calculator. These tools are planning aids; Medicare.gov and your plan documents control enrollment and coverage details.

Frequently asked questions

Sources and disclaimer

Figures are based on CMS’s 2027 Part D announcement and Medicare’s official enrollment guidance checked September 22, 2026. Program rules, premiums and plan availability can change. This article is educational and is not Medicare, insurance, tax or financial advice.