ICD-10-CM > S00-T88 > T51-T65 > T65 > T65.1 > T65.1X > T65.1X4 T65.1X4 Toxic effect of strychnine and its salts, undetermined Non-Billable/Non-Specific Codes T65.1X4A..., initial encounterT65.1X4D..., subsequent encounterT65.1X4S..., sequela