T27.4Corrosion of larynx and trachea

T27.4 is the ICD-10-CM diagnosis code for corrosion of larynx and trachea. It belongs to category T27 (burn and corrosion of respiratory tract), block T26-T28 (burns and corrosions confined to eye and internal organs) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within T27 (burn and corrosion of respiratory tract), T27.4 is specifically for corrosion of larynx and trachea. Related codes cover burn of larynx and trachea (T27.0), burn involving larynx and trachea with lung (T27.1), burn of other parts of respiratory tract (T27.2), burn of respiratory tract, part unspecified (T27.3), corrosion involving larynx and trachea with lung (T27.5), corrosion of other parts of respiratory tract (T27.6) and corrosion of respiratory tract, part unspecified (T27.7).

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

Code first: (T51-T65) to identify chemical and intent.

Use an additional code for: external cause code to identify the source and intent of the burn (X00-X19, X75-X77, X96-X98) and external cause code to identify place (Y92).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.