I can't give you a reference, but having done comanaged care for many years, I can tell you that we always mentioned the other comanaging providers name in our reports.
There was also a form the surgeon used when sending the patient back for post op care which both he and the patient signed which listed my name as the doctor doing the post op care. The form basically stated that the surgeon was releasing the patient to me for post op and the patient was consenting to that being done. When I saw the patient, I would generate a report of my findings which went back to the surgeon.
If you don't have the paperwork showing transition of care or any reports from the provider of the post op care going back to the surgeon, it doesn't meet the criteria for comanagement.
Tom Cheezum, O.D., CPC