I have a doctor that i bill for that is a pmr (physical medicaine and rehab) and see most his patients in a inptient setting. He has other doctors that cover each others call on weekends. They are all solo practioners. My problem is that my doctor does the admit to rehab floor of hospital on friday. On saturday the call coverage doctor rounds on his patients and does her on h&p and bills that way. I told my doctor that his claim goes out 99221 ai-99223 ai, and her billing should only be subsequebt charges 99231-99233. She has told him that she bills intial eval codes with a modifier. What could she be billing with. I can not find any information to prove thius is correct billing. Can someone please help? Thanks lisa smith cpc