ICD-10-CM > S00-T88 > T51-T65 > T51 > T51.1 > T51.1X > T51.1X4 T51.1X4 Toxic effect of methanol, undetermined Non-Billable/Non-Specific Codes T51.1X4A..., initial encounterT51.1X4D..., subsequent encounterT51.1X4S..., sequela