With Medicare eliminating the -KX modifier on July 1st, there's been some hot debate in our office for how to code for Medicare patients. I am inclined to bill with a -GP, -GA combo and have the patient complete an ABN, and submit claims in that format until we get a denial from Medicare and then deal with that however it comes down the pike. An office administrator spoke to someone at the APTA who suggested using a -GY modifier. That doesn't sit right with me since Medicare doesn't routinely or statutorily exclude physical therapy benefits. We have been unable to get a concrete answer on this. Does anyone have any information or suggestions for where we can get a more definitive ruling?