Is Medicare going to adopt the practice of private health insurance and start covering PrEP without cost-sharing under Part B medical insurance (e.g., outpatient care, some preventive services)?
That's to-be-determined, but CMS, the federal agency that administers Medicare, has sent a signal of sorts with issuance of a fact sheet that largely outlines steps for pharmacies and claims processors on administrative handling of PrEP.
HIV.gov has prepared a nice summary, CMS Alerts Pharmacies and Healthcare Providers About Potential Medicare Coverage Change for PrEP, with a link to the fact sheet from CMS.
Learn more about PrEP in PrEP Policies and Programs Help End the HIV Epidemic and The ABCDs of Medicare Coverage.