Frequently Asked Questions About Medicare Part D Costs

Why did my Medicare Part D premium increase if federal law capped drug costs?

Federal law capped your individual out-of-pocket spending at $2,100 for 2026, but it did not cap the total operating costs of insurance companies. Because insurers now pay a larger share of catastrophic medication costs that the government previously subsidized, insurance companies raised monthly premiums, enlarged deductibles, and shifted drug tiers across their plans to recover revenue.

What happens if I miss the Medicare Open Enrollment deadline on December 7?

If you miss the December 7 deadline, you generally must remain in your existing Medicare Part D plan for the entire upcoming calendar year. Unless you qualify for a Special Enrollment Period (SEP)—such as moving out of your plan’s service area or losing employer coverage—you cannot switch plans until the next annual open enrollment window opens the following October.

Can my Medicare Part D plan remove a drug from its formulary mid-year?

Insurance plans generally cannot drop covered drugs or move them to higher cost-sharing tiers between January 1 and December 31, except under strict conditions. Insurers can modify coverage mid-year if the FDA deems a drug unsafe, if a manufacturer withdraws the drug from the market, or if an generic equivalent becomes available. If a plan modifies coverage mid-year, it must provide you with at least 30 days advance written notice.

How does the Medicare Prescription Payment Plan work?

The Medicare Prescription Payment Plan is a voluntary payment arrangement established under the Inflation Reduction Act. It allows you to spread your out-of-pocket drug costs into monthly billing payments calculated by your plan sponsor rather than paying full copays at the pharmacy counter. This payment plan does not reduce your total prescription cost, but it eliminates upfront financial shocks early in the plan year.