ICD-10-CM > S00-T88 > T51-T65 > T54 > T54.9 > T54.91 T54.91 Toxic effect of unspecified corrosive substance, accidental (unintentional) Non-Billable/Non-Specific Codes T54.91XA..., initial encounterT54.91XD..., subsequent encounterT54.91XS..., sequela