ICD-10 Code G43.B1 – Ophthalmoplegic migraine, intractable (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G43.B1 – Ophthalmoplegic migraine, intractable
What it is
G43.B1 identifies ophthalmoplegic migraine that is documented as intractable, meaning the condition is difficult to control or does not respond well to usual management. Use the code only when the record supports both the migraine diagnosis and the intractable designation.
Clinical signs
Clinical features typically include recurrent migraine-like headache with one or more cranial nerve palsies affecting eye movement, such as diplopia or ptosis. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider explicitly documents ophthalmoplegic migraine and states that it is intractable, refractory, or poorly controlled. It may also apply when the note clearly describes persistent ophthalmoplegic migraine symptoms despite treatment. Check documentation if the record uses older terminology or is unclear.
Do not use for
Do not use this code for ordinary migraine without ophthalmoplegia, or for eye movement problems caused by other neurologic or ocular disorders. If intractability is not documented, check documentation before assigning G43.B1.
Coding tip
Code the condition only when both the ophthalmoplegic feature and the intractable status are clearly stated in the medical record.