I just opened a bill from my physical therapists. My last session was in August.
It seems Aetna, my insurer, hasn't paid them a dime--the bills were denied. So either they want me to get Aetna to pay them, or I can pay them $3,583.
You can be sure I'll call Aetna today to wish them the very Merriest of Christmases as well.
Addendum: Upon calming down and examining the letter more closely, I saw that the payments weren't made from June 19 through the end of rehab on August 7 (my ACL surgery was March 27, and I started rehab two days later). I called Aetna, which said it sent a check on Dec. 6--three days after my therapists sent me their letter. So this little issue should be resolved--phew!