All Part D plans must include at least two drugs from most categories and must cover all drugs available in the following categories: HIV/AIDS treatments. Antidepressants. Antipsychotic medications. Anticonvulsive treatments for seizure disorders. Immunosuppressant drugs. Anticancer drugs (unless covered by Part B) Medicare Part D drug coverage Medicare Interactive https://www.medicareinteractive.org Medicare Interactive https://www.medicareinteractive.org