ICD-10 Code G43.C1 – Periodic headache syndromes in child or adult, intractable (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G43.C1 – Periodic headache syndromes in child or adult, intractable
What it is
This code identifies a periodic headache syndrome, such as migraine-related or other recurrent headache patterns, that is documented as intractable. It applies when the condition is persistent or difficult to control and the record supports the specific diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Typical records describe recurrent headache episodes with a recognizable pattern, associated symptoms such as nausea, light sensitivity, or sound sensitivity, and poor response to usual management.
When to use this code
Use this code when the provider documents a periodic headache syndrome and clearly states that it is intractable. It is appropriate for children or adults when the chart supports recurrent attacks rather than a single isolated headache. Check documentation if the note only says “headache” or does not confirm intractability.
Do not use for
Do not use this code for an unspecified headache, a one-time headache episode, or a periodic headache syndrome without intractable status. If the record names a different migraine subtype or another headache disorder, code the documented condition instead.
Coding tip
Confirm both elements in the note: periodic headache syndrome and intractable; if either is missing, query or code more specifically.