Medicare Part D Faces Major Changes Ahead of 2027 Enrollment Period

Medicare beneficiaries are facing significant changes to Part D prescription drug coverage and Medicare Advantage payments as the 2027 Annual Enrollment Period approaches.

Analysts say shifts in subsidies and plan structures could affect premiums and out-of-pocket costs for millions of seniors. The changes stem from provisions in recent federal legislation and ongoing adjustments by the Centers for Medicare and Medicaid Services.

Part D, which covers prescription drugs, has undergone several structural changes in recent years. A new out-of-pocket cap on drug costs took effect in 2025, and additional adjustments to how insurers are reimbursed are rolling out in 2026 and 2027. Some plans have responded by raising premiums or narrowing their drug formularies.

Medicare Advantage, the private insurance alternative to traditional Medicare, is also seeing payment adjustments. Insurers have warned that reduced payments could lead to benefit cuts or plan exits in some markets, particularly in rural areas where profit margins are thinner.

Financial advisors who work with retirees say this is a critical year to review Medicare coverage. "The plan that worked well for you last year may not be the best option in 2027," said one advisor. "Beneficiaries need to compare their options carefully during open enrollment."

The 2027 Annual Enrollment Period runs from October 15 to December 7, 2026. During this window, Medicare beneficiaries can switch plans, add or drop Part D coverage, or move between traditional Medicare and Medicare Advantage.

The Social Security Administration has also revised its estimate for the 2027 Cost-of-Living Adjustment downward as inflation moderates, which could affect the purchasing power of fixed-income seniors.