Assigning codes for recurring services

Q: We had been assigning ICD-10-CM code Z51.89 (encounter for other specified aftercare) to report cardio-pulmonary rehab series (recurring) accounts and then whatever diagnosis the physician used on the order. It has been suggested, however, to stop using the Z code and only use the diagnosis given. This seems problematic given that this would mean we’d be coding diagnoses such as CABG (Z95.1) as both admitting and primary. Is there a code that that you would suggest that would work better than Z51.89?
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