G44 - Other headache syndromes
G44.0 - Cluster headaches and other trigeminal autonomic cephalgias (TAC)
G44.00 - Cluster headache syndrome, unspecified
G44.001 - Cluster headache syndrome, unspecified, intractable
G44.009 - Cluster headache syndrome, unspecified, not intractable
G44.01 - Episodic cluster headache
G44.011 - Episodic cluster headache, intractable
G44.019 - Episodic cluster headache, not intractable
G44.02 - Chronic cluster headache
G44.021 - Chronic cluster headache, intractable
G44.029 - Chronic cluster headache, not intractable
G44.03 - Episodic paroxysmal hemicrania
G44.031 - Episodic paroxysmal hemicrania, intractable
G44.039 - Episodic paroxysmal hemicrania, not intractable
G44.04 - Chronic paroxysmal hemicrania
G44.041 - Chronic paroxysmal hemicrania, intractable
G44.049 - Chronic paroxysmal hemicrania, not intractable
G44.05 - Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT)
G44.051 - Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT), intractable
G44.059 - Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT), not intractable
G44.09 - Other trigeminal autonomic cephalgias (TAC)
G44.091 - Other trigeminal autonomic cephalgias (TAC), intractable
G44.099 - Other trigeminal autonomic cephalgias (TAC), not intractable