ICD-10-CM > D50-D89 > D70-D77 > D74 > D74.0 D74.0 Congenital methemoglobinemia Billable/Specific Copy Code Copy Description Applicable To Congenital NADH-methemoglobin reductase deficiencyHemoglobin-M [Hb-M] diseaseMethemoglobinemia, hereditary