ICD-10-CM > G00-G99 > G40-G47 > G44 > G44.0 > G44.05 G44.05 Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT) Non-Billable/Non-Specific Codes G44.051Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT), intractableG44.059Short lasting unilateral neuralgiform headache with conjunctival injection and tearing (SUNCT), not intractable