ICD-10-CM > S00-T88 > T26-T28 > T27 > T27.4 T27.4 Corrosion of larynx and trachea Non-Billable/Non-Specific Code First (T51-T65) to identify chemical and intent Codes T27.4XXA..., initial encounterT27.4XXD..., subsequent encounterT27.4XXS..., sequela