ICD-10-CM > S00-T88 > T26-T28 > T28 > T28.7 T28.7 Corrosion of other parts of alimentary tract Non-Billable/Non-Specific Code First (T51-T65) to identify chemical and intent Codes T28.7XXA..., initial encounterT28.7XXD..., subsequent encounterT28.7XXS..., sequela