ICD-10 Code G44.8 – Other specified headache syndromes (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G44.8 – Other specified headache syndromes
What it is
G44.8 identifies headache syndromes that do not fit a more specific ICD-10 category but are still clinically recognized. Use it when the provider documents a named or described headache disorder that is not otherwise classified.
Clinical signs
Clinical features vary; refer to documentation. Headache may be recurrent, unilateral or bilateral, and may have associated neurologic or autonomic features depending on the specific syndrome described.
When to use this code
Use this code when the record clearly states an “other specified” headache syndrome and no more specific headache code applies. It is appropriate when the clinician names a distinct headache pattern but the documentation does not support a different category. Check documentation if the diagnosis is vague.
Do not use for
Do not use G44.8 for migraine, tension-type headache, cluster headache, or other headache types with their own specific codes. Also avoid it when the provider only documents nonspecific headache without a defined syndrome.
Coding tip
Code the most specific headache diagnosis documented; if the syndrome name is unclear, query the provider before using G44.8.