ICD-10 Code G43.C – Periodic headache syndromes in child or adult (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G43.C – Periodic headache syndromes in child or adult
What it is
This code identifies a group of recurring headache disorders that occur in children or adults. Use it when documentation describes a periodic headache syndrome rather than a single isolated headache episode.
Clinical signs
These disorders typically involve repeated headache attacks with symptom-free intervals between episodes. Clinical features vary; refer to documentation for the specific syndrome, pattern, and associated findings.
When to use this code
Use G43.C when the record clearly states a periodic headache syndrome and does not name a more specific migraine subtype. It may apply when the clinician documents recurrent, patterned headache episodes in a child or adult. Check documentation if the note is vague or uses only “headache.”
Do not use for
Do not use this code for a one-time headache, nonspecific head pain, or a different documented headache disorder. If the provider names a more specific migraine diagnosis, code that instead.
Coding tip
Choose the most specific headache diagnosis documented; if the syndrome type is unclear, query the provider before assigning G43.C.