G44.0 vs G44.1
G44.0 (Cluster headaches and other trigeminal autonomic cephalgias (TAC)) compared with G44.1 (Vascular headache, not elsewhere classified), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).
Can these codes be reported together?
Yes, when both are documented. G44.1 carries an Excludes2 note covering G44.0: “cluster headache (G44.0)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| G44.0Cluster headaches and other trigeminal autonomic cephalgias (TAC) | G44.1Vascular headache, not elsewhere classified | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | G00-G99 — Diseases of the Nervous System (G00-G99) | G00-G99 — Diseases of the Nervous System (G00-G99) |
| Definition | Cluster headaches and other trigeminal autonomic cephalgias (TAC) is a non-billable ICD-10-CM category code (G44.0). | Vascular headache, not elsewhere classified is a billable ICD-10-CM diagnosis code (G44.1). |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources