I received an EOB (United healthcare) for a claim for physical therapy that has 6 different dates of service. 5 of the DOS billed the same for 4 units of CPT code 97110 and 1 DOS billed for 3 units of 97110. The claim paid only one date of the 4 unit dates, and the one date for 3 units. Denial for the other dates says "this is not a separately reimbursable service or supply". I bill for that code all the time and sometimes it pays and sometimes not - another EOB paid 3 out of 6 dates of service, with the same denial code for the ones not paid. It seems to be random. Why would they pay for some and not others billed the same way? Surely they don't want separate claims for each DOS.