Please check again on the rehab! Medicare will pay beyond 6 weeks on a case-by-case basis if you are progressing. After my wrist surgery a few years ago, healing was slower than anticipated and I was able to get 2 extensions - the first for 6 weeks, the second foe 3 more. The same applied in 2020 to my pain rehab PT - it lasted over 3 months 2X/week, then 3 more months weekly - since I was making progress.
Have you had the therapist and/or referring doc request an extension?
Sue