what is the cpt code for phenylketonuria
2016 ICD-10-CM Diagnosis Code E70.0. Classical phenylketonuria. 1  E70.0 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.  Reimbursement claims with a date of service on or after Oct 1, 2015 require the use of ICD-10-CM codes.