ICD-10-CM > S00-T88 > T51-T65 > T59 > T59.7 > T59.7X > T59.7X4 T59.7X4 Toxic effect of carbon dioxide, undetermined Non-Billable/Non-Specific Codes T59.7X4A..., initial encounterT59.7X4D..., subsequent encounterT59.7X4S..., sequela