we billed the claim to Medicare with DX code Z11.59 with office visit and U0002 Code. Medicare paid for U0002 but denied office visit for routine /preventive exam or a diagnostic/screening procedure done. Im not sure what other diagnosis code to use because patient was only here for testing . i have attach the chart note, can any one help me what other diagnosis code i can use to get the office visit paid. i was looking around saw DX Z20.828 but not sure if that is correct.