ICD-10-CM > S00-T88 > T51-T65 > T59 > T59.7 > T59.7X > T59.7X2 T59.7X2 Toxic effect of carbon dioxide, intentional self-harm Non-Billable/Non-Specific Codes T59.7X2A..., initial encounterT59.7X2D..., subsequent encounterT59.7X2S..., sequela