T20.5Corrosion of first degree of head, face, and neck

T20.5 is the ICD-10-CM diagnosis code for corrosion of first degree of head, face, and neck. It belongs to category T20 (burn and corrosion of head, face, and neck), block T20-T25 (burns and corrosions of external body surface, specified by site) 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 9 subcodes must be used instead.

Within T20 (burn and corrosion of head, face, and neck), T20.5 is specifically for corrosion of first degree of head, face, and neck. Related codes cover burn of unspecified degree of head, face, and neck (T20.0), burn of first degree of head, face, and neck (T20.1), burn of second degree of head, face, and neck (T20.2), burn of third degree of head, face, and neck (T20.3), corrosion of unspecified degree of head, face, and neck (T20.4), corrosion of second degree of head, face, and neck (T20.6) and corrosion of third degree of head, face, and neck (T20.7).

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 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.