ICD-10-CM > E00-E89 > E70-E88 > E72 > E72.2 E72.2 Disorders of urea cycle metabolism Non-Billable/Non-Specific Type 1 Excludes disorders of ornithine metabolism (E72.4) Codes E72.20Disorder of urea cycle metabolism, unspecifiedE72.21ArgininemiaE72.22Arginosuccinic aciduriaE72.23CitrullinemiaE72.29Other disorders of urea cycle metabolism