ICD-10-CM > S00-T88 > T51-T65 > T54 > T54.2 > T54.2X > T54.2X4 T54.2X4 Toxic effect of corrosive acids and acid-like substances, undetermined Non-Billable/Non-Specific Codes T54.2X4A..., initial encounterT54.2X4D..., subsequent encounterT54.2X4S..., sequela