Medicare Part D and Prescription Drug Costs: The New $2,400 Cap

The Inflation Reduction Act introduced major restructuring to Medicare Part D prescription coverage to limit out-of-pocket expenses. In 2027, the annual out-of-pocket spending cap is indexed for inflation to $2,400, up from $2,000 in 2025.

Once your out-of-pocket spending on covered formulary drugs reaches $2,400 in 2027, you enter the catastrophic coverage phase. In this phase, Medicare pays 100% of your covered prescription costs for the rest of the calendar year.

The standard statutory Part D deductible is set at $700 for 2027, increasing from $615 in 2026. Individual insurance carriers can charge lower deductibles or eliminate them entirely depending on plan design.

CMS calculated the 2027 statutory national base beneficiary premium at $41.33 per month. This baseline rate remains protected by a statutory 6% annual cap on base premium growth to prevent sudden premium spikes.

Retirees can also utilize the Medicare Prescription Payment Plan to spread high drug costs across equal monthly payments. This payment smoothing option helps you manage cash flow if you fill costly medications early in the year.

Reviewing your plan on Medicare.gov ensures you pick a formulary that covers your specific prescriptions under the new $2,400 limit.