ICD-10-CM › S00-T88 › T20-T25 › T21.45 Corrosion of unspecified degree of buttock › T21.45XS

Valid for claims with a date of service in the current code year.

Valid FY2016 onwards.

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 > anus
• Corrosion > trunk > anus
• Corrosion > trunk > buttock
• Corrosion > buttock

Codes in the same group

Code	Description	Status
T21.45XA	Corrosion of unspecified degree of buttock, initial encounter	Valid
T21.45XD	Corrosion of unspecified degree of buttock, subsequent encounter	Valid