ICD-10-CM > E00-E89 > E70-E88 > E72 > E72.1 E72.1 Disorders of sulfur-bearing amino-acid metabolism Non-Billable/Non-Specific Type 1 Excludes cystinosis (E72.04)cystinuria (E72.01)transcobalamin II deficiency (D51.2) Codes E72.10Disorders of sulfur-bearing amino-acid metabolism, unspecifiedE72.11HomocystinuriaE72.12Methylenetetrahydrofolate reductase deficiencyE72.19Other disorders of sulfur-bearing amino-acid metabolism