ICD-10 Code D74.8 – Other methemoglobinemias (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D74.8 – Other methemoglobinemias
What it is
D74.8 identifies methemoglobinemia that does not fit a more specific ICD-10 category. It is used when hemoglobin is altered so it cannot carry oxygen normally, but the cause is documented as other or unspecified.
Clinical signs
Clinical features vary; refer to documentation. Commonly noted findings include cyanosis, low oxygen saturation that may not improve as expected, and symptoms of hypoxia such as shortness of breath, headache, or fatigue.
When to use this code
Use D74.8 when the record clearly states other methemoglobinemia or a methemoglobinemia diagnosis that is not described by a more specific code. It also fits when the provider documents an acquired or atypical form without further detail. Check documentation if the cause is uncertain or if a more specific etiology is named.
Do not use for
Do not use this code for congenital methemoglobinemia or for drug-induced methemoglobinemia when a more specific code is available. If the chart only notes cyanosis or hypoxemia without methemoglobinemia, choose the documented condition instead.
Coding tip
Code the most specific methemoglobinemia type documented, and query the provider if the record says only “methemoglobinemia” without a clear subtype.