Medicare coverage for Cialis, a medication used to treat erectile dysfunction (ED), is complex and primarily depends on the specific Medicare plan. Original Medicare (Parts A and B) generally does not cover prescription drugs like Cialis. However, Medicare Part D, the prescription drug benefit, can cover Cialis, but coverage varies significantly between different Part D plans. Factors influencing coverage include the plan's formulary (list of covered drugs), cost-sharing arrangements (deductibles, copays, coinsurance), and any prior authorization requirements.