Corrosion of first degree of trunk

Not billableICD-10-CM diagnosis code.

This code exists but cannot be submitted on its own. It groups the more specific codes beneath it.

A category header for its whole life, FY2016 onwards. It has never been valid for submission on its own.

Submit one of these 9 more specific codes instead:

T21.50 Corrosion of first degree of trunk, unspecified site (also a header)
T21.51 Corrosion of first degree of chest wall (also a header)
T21.52 Corrosion of first degree of abdominal wall (also a header)
T21.53 Corrosion of first degree of upper back (also a header)
T21.54 Corrosion of first degree of lower back (also a header)
T21.55 Corrosion of first degree of buttock (also a header)
T21.56 Corrosion of first degree of male genital region (also a header)
T21.57 Corrosion of first degree of female genital region (also a header)
T21.59 Corrosion of first degree of other site of trunk (also a header)

This code requires a seventh character. See the rule below.

What has happened to this code

Every change the publisher made, from 2012 to now. Entries marked draft are from the pre-implementation releases: ICD-10 took effect on 1 October 2015, so nothing before FY2016 was ever valid on a claim.

FY2012 Added to the draft code set draft Corrosion of first degree of trunk

Official coding rules

Published by CDC for FY2027. A rule attached to a category binds every code beneath it, so the rules inherited from this code's ancestors are shown with the code they come from.

Inherited from T21 Burn and corrosion of trunk

Seventh character required

The appropriate 7th character is to be added to each code from category T21

Excludes2 - not included here

burns and corrosion of axilla (T22.- with fifth character 4)
burns and corrosion of scapular region (T22.- with fifth character 6)
burns and corrosion of shoulder (T22.- with fifth character 5)

Includes

burns and corrosion of hip region

Inherited from the T20-T25 section Burns and corrosions of external body surface, specified by site (T20-T25)

Use additional code

code from category T31 or T32 to identify extent of body surface involved

Includes

burns and corrosions of first degree [erythema]
burns and corrosions of second degree [blisters][epidermal loss]
burns and corrosions of third degree [deep necrosis of underlying tissue] [full- thickness skin loss]

Codes in the same group

Code	Description	Status
T21.0	Burn of unspecified degree of trunk	Not billable
T21.1	Burn of first degree of trunk	Not billable
T21.2	Burn of second degree of trunk	Not billable
T21.3	Burn of third degree of trunk	Not billable
T21.4	Corrosion of unspecified degree of trunk	Not billable
T21.6	Corrosion of second degree of trunk	Not billable
T21.7	Corrosion of third degree of trunk	Not billable