ICD-10-CM > S00-T88 > T26-T28 > T27 > T27.7 T27.7 Corrosion of respiratory tract, part unspecified Non-Billable/Non-Specific Code First (T51-T65) to identify chemical and intent Codes T27.7XXA..., initial encounterT27.7XXD..., subsequent encounterT27.7XXS..., sequela