A8.4 Persistent headache attributed to past use of or exposure to a substance

Coded elsewhere:

8.2 Medication-overuse headache.

Diagnostic criteria:

1. Headache previously diagnosed as 8.1 Headache attributed to use of or exposure to a substance or one of its subtypes, and fulfilling criterion C
2. Use of or exposure to the substance has ceased
3. Headache has persisted for >3 months after exposure has ceased
4. Not better accounted for by another ICHD-3 diagnosis.