T20.4

T20.4: Corrosion of unspecified degree of head, face, and neck

Non-billable headerICD-10-CM

T20.4 is a non-billable header ICD-10-CM code for corrosion of unspecified degree of head, face, and neck. It cannot be billed on its own: choose one of the more specific child codes below. This code also requires a 7th character before it is complete.

This code requires a 7th character

The appropriate 7th character is to be added to each code from category T20

A: initial encounter
D: subsequent encounter
S: sequela

Code first

The underlying condition must be sequenced before this code.

(T51-T65) to identify chemical and intent

Use additional code

Add a secondary code to capture the detail described below.

external cause code to identify place (Y92)

Excludes2 inherited from the categories above T20.4

Not part of this code, but both may be coded when both are present.

Written on T20: Burn and corrosion of head, face, and neck

burn and corrosion of ear drum (T28.41, T28.91)
burn and corrosion of eye and adnexa (T26.-)
burn and corrosion of mouth and pharynx (T28.0)

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Code history

Unchanged in every release from FY2024 to FY2027.

Code to one of these instead T20.4

9 child codes. Green means billable.