ICD-10 Code D74 – Methemoglobinemia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D74 – Methemoglobinemia
What it is
D74 identifies methemoglobinemia, a disorder in which hemoglobin is altered and cannot carry oxygen normally. Use this code when the record documents methemoglobinemia, including acquired or congenital forms if no more specific code is given.
Clinical signs
Clinical features vary; refer to documentation. Commonly noted findings include cyanosis that does not improve as expected and signs of tissue hypoxia despite adequate oxygen delivery.
When to use this code
Use D74 when the provider diagnoses methemoglobinemia or records it as an active condition affecting care. It may appear after exposure to an oxidizing agent, a medication reaction, or as a hereditary condition. If the chart specifies a more detailed subtype, code that documented form instead.
Do not use for
Do not use D74 for unspecified cyanosis or general hypoxemia without documentation of methemoglobinemia. If the record does not clearly support the diagnosis, check documentation.
Coding tip
Confirm the diagnosis is explicitly stated in the assessment or discharge summary before assigning D74.