Disapprove. For Version 4050 and beyond, Loop 2200E Payer Claim Identification Number REF has been made Situational. However, in order for the requestor to meet the current syntactical requirements of Version 4010A1, we recommend using a zero (0) in element REF02 when a claim number can not be found or echoback the same number reported in the 276, if one was submitted.