ICD-10-CM › S00-T88 › T20-T25 › T21.5 Corrosion of first degree of trunk › T21.52

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 3 more specific codes instead:

• T21.52XA Corrosion of first degree of abdominal wall, initial encounter
• T21.52XD Corrosion of first degree of abdominal wall, subsequent encounter
• T21.52XS Corrosion of first degree of abdominal wall, sequela

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

What has happened to this code

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]

How CDC's index refers to this code

Wording from the official alphabetic index. Much of it appears nowhere in the code description, which is why a search for the everyday phrase so often finds nothing.

• Corrosion > flank
• Corrosion > abdomen, abdominal > first degree

Codes in the same group

Code	Description	Status
T21.50	Corrosion of first degree of trunk, unspecified site	Not billable
T21.51	Corrosion of first degree of chest wall	Not billable
T21.53	Corrosion of first degree of upper back	Not billable
T21.54	Corrosion of first degree of lower back	Not billable
T21.55	Corrosion of first degree of buttock	Not billable
T21.56	Corrosion of first degree of male genital region	Not billable
T21.57	Corrosion of first degree of female genital region	Not billable
T21.59	Corrosion of first degree of other site of trunk	Not billable