T27.7Corrosion of respiratory tract, part unspecified

T27.7 is the ICD-10-CM diagnosis code for corrosion of respiratory tract, part unspecified. 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, choose T27.7 (Corrosion of respiratory tract, part unspecified) only when documentation doesn't support a more specific option: 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 of larynx and trachea (T27.4), corrosion involving larynx and trachea with lung (T27.5) and corrosion of other parts of respiratory tract (T27.6).

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.