G44.00: Cluster headache syndrome, unspecified inclusionTerm Ciliary neuralgia Cluster headache NOS Histamine cephalgia Lower half migraine Migrainous neuralgia inclusionTerm Cluster headache syndrome NOS |
| G44.001: Cluster headache syndrome, unspecified, intractable |
| G44.009: Cluster headache syndrome, unspecified, not intractable |