ICD-10 Code G43.91 – Migraine, unspecified, intractable (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G43.91 – Migraine, unspecified, intractable
What it is
This code identifies a migraine diagnosis when the type is not further specified and the headache is described as intractable, meaning it is difficult to control or does not respond well to usual management.
Clinical signs
Clinical features vary; refer to documentation. Migraine commonly presents with recurrent headache, nausea, and sensitivity to light or sound, but the record should support the migraine diagnosis and the intractable status.
When to use this code
Use this code when the provider documents migraine without a more specific subtype and indicates it is intractable. It is appropriate in outpatient, emergency, or inpatient records when the condition is clearly stated. Check documentation if the note only says “migraine” or does not confirm refractory symptoms.
Do not use for
Do not use this code for a specified migraine type when the record identifies aura, status migrainosus, or another subtype. Do not assume intractability unless the provider documents it.
Coding tip
Code only what the provider states; if “intractable” is missing, query or use the unspecified migraine code that matches the documentation.