| Full description | Cluster headaches and other trigeminal autonomic cephalgias (TAC) |
| Billable | No — use a more specific child code |
| Chapter | Chapter 6: Diseases of the nervous system (G00-G99) |
| Section | Episodic and paroxysmal disorders (G40-G47) |
| Parent code | G44 — Other headache syndromes |