ICD-10-CM > S00-T88 > T51-T65 > T65 > T65.0 > T65.0X > T65.0X4 T65.0X4 Toxic effect of cyanides, undetermined Non-Billable/Non-Specific Codes T65.0X4A..., initial encounterT65.0X4D..., subsequent encounterT65.0X4S..., sequela