ICD-10-CM > S00-T88 > T51-T65 > T59 > T59.4 > T59.4X > T59.4X1 T59.4X1 Toxic effect of chlorine gas, accidental (unintentional) Non-Billable/Non-Specific Applicable To Toxic effect of chlorine gas NOS Codes T59.4X1A..., initial encounterT59.4X1D..., subsequent encounterT59.4X1S..., sequela