I think that’s what I used two years ago when I got Covid while I was out of state from my Medicaid. The pharmacy wanted to charge me $800 or thereabouts seventeen hundred dollars but after a very quick phone call to the Paxcess hotline I had my free prescription later that day.

Edit - According to my records I used a slightly different service, also available on their website: https://www.paxlovid.com/enroll-in-co-pay-program