Medicare Part D generally does not cover Viagra or sildenafil when the drug is prescribed to treat sexual or erectile dysfunction. Federal law excludes drugs used for that purpose from the definition of a Part D drug.
The prescribed use matters
Sildenafil has FDA-approved uses other than erectile dysfunction. Part D may cover sildenafil when it is prescribed for an FDA-approved condition other than sexual or erectile dysfunction and the drug meets the plan’s formulary rules. CMS has identified pulmonary hypertension as an example of another approved indication.
The same active ingredient can therefore have a different Part D coverage result depending on the diagnosis, product, dose, and prescribed use. A pharmacy claim may require diagnosis information or prior authorization. Coverage for one use does not mean the plan covers the drug for erectile dysfunction.
Costs and plan options
A person generally pays the full price when the drug is prescribed for erectile dysfunction and the plan does not offer supplemental coverage. Some enhanced private plans may choose to offer excluded drugs as a supplemental benefit. Such coverage is not required by basic Part D and can have separate limits and cost sharing.
When sildenafil is covered for another approved indication, the cost depends on the plan formulary, tier, pharmacy, quantity, and current Part D spending stage. Prior authorization, step therapy, or quantity limits may apply. If a medically accepted use is covered in principle but the plan denies the claim, the enrollee or prescriber can request a coverage determination or exception.
Original Medicare Parts A and B do not generally cover outpatient prescriptions filled at a pharmacy. Medicare Advantage drug coverage follows Part D rules. A plan without drug coverage does not provide routine outpatient prescription coverage.
What to do next
- Ask the pharmacy to process the exact product, dose, and prescribed use.
- Check the plan formulary for sildenafil and any prior authorization requirement.
- Do not submit a different diagnosis to obtain coverage.
- If a claim for another FDA-approved use is denied, ask the plan for the written reason and coverage determination process.
- Review the CMS Part D guidance on erectile dysfunction drugs and Medicare’s drug plan rules.
Sources
- CMS: Questions and answers about erectile dysfunction drugs under Part D
- Medicare: Drug plan rules
- FDA: Sildenafil drug information
Coverage and costs can change each calendar year. Check current Medicare rules and current plan documents before receiving care. A provider’s estimate is not a Medicare coverage decision. Final payment depends on the claim and the applicable coverage requirements.
Last reviewed: August 2026. Medicare rules and plan benefits can change.