ICD-10-CM > G00-G99 > G40-G47 > G44 > G44.0 > G44.01 G44.01 Episodic cluster headache Non-Billable/Non-Specific Codes G44.011Episodic cluster headache, intractableG44.019Episodic cluster headache, not intractable
ICD-10 Fast ICD-10 Fast