ICD-10-CM > G00-G99 > G40-G47 > G44 > G44.2 G44.2 Tension-type headache Non-Billable/Non-Specific Codes G44.20Tension-type headache, unspecifiedG44.201Tension-type headache, unspecified, intractableG44.209Tension-type headache, unspecified, not intractableG44.21Episodic tension-type headacheG44.211Episodic tension-type headache, intractableG44.219Episodic tension-type headache, not intractableG44.22Chronic tension-type headacheG44.221Chronic tension-type headache, intractableG44.229Chronic tension-type headache, not intractable