ICD-10-CM > S00-T88 > T51-T65 > T59 > T59.4 > T59.4X > T59.4X2 T59.4X2 Toxic effect of chlorine gas, intentional self-harm Non-Billable/Non-Specific Codes T59.4X2A..., initial encounterT59.4X2D..., subsequent encounterT59.4X2S..., sequela