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 migrainosus NOS
 * G43.909 Migraine, unspecified, not intractable, without status migrainosus
 * Migraine NOS
 * G43.91 Migraine, unspecified, intractable
 * G43.911 Migraine, unspecified, not intractable, with status migrainosus
 * G43.919 Migraine, unspecified, not intractable, without status migrainosus

G44 Other headache syndromes

 * Excludes1: headache NOS (R51)
 * Excludes2: atypical facial pain (G50.1)
 * headache due to lumbar puncture (G97.1)
 * migraines (G43.-)
 * trigeminal neuralgia (G50.0)
 * G44.0 Cluster headaches and other trigeminal autonomic cephalgias (TAC)
 * G44.00 Cluster headache syndrome, unspecified
 * Ciliary neuralgia
 * Cluster headache NOS
 * Histamine cephalgia
 * Lower half migraine
 * Migrainous neuralgia
 * G44.001 Cluster headache syndrome, unspecified, intractable
 * G44.009 Cluster headache syndrome, unspecified, not intractable
 * Cluster headache syndrome NOS
 * G44.01 Episodic cluster headache
 * G44.011 Episodic cluster headache, intractable
 * G44.019 Episodic cluster headache, not intractable
 * Episodic cluster headache NOS
 * G44.02 Chronic cluster headache
 * G44.021 Chronic cluster headache, intractable
 * G44.029 Chronic cluster headache, not intractable
 * Chronic cluster headache NOS
 * G44.03 Episodic paroxysmal hemicrania
 * Paroxysmal hemicrania NOS
 * G44.031 Episodic paroxysmal hemicrania, intractable
 * G44.039 Episodic paroxysmal hemicrania, not intractable
 * Episodic paroxysmal hemicrania NOS
 * G44.04 Chronic paroxysmal hemicrania
 * G44.041 Chronic paroxysmal hemicrania, intractable
 * G44.