ICD-10-CM 2027
ICD-10 code for buttock s corrosion
From the official ICD-10-CM alphabetic index entry “Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal) › buttock (s)”. Page updated September 29, 2026.
About coding buttock s corrosion
The ICD-10-CM code for buttock s corrosion is T21.45 (Corrosion of unspecified degree of buttock). The official index lists 3 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on T21.45.
Within T21.4 (corrosion of unspecified degree of trunk), T21.45 is specifically for corrosion of unspecified degree of buttock. Related codes cover unspecified site (T21.40), chest wall (T21.41), abdominal wall (T21.42), upper back (T21.43), lower back (T21.44), male genital region (T21.46), female genital region (T21.47) and other site of trunk (T21.49).
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.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
More specific buttock s corrosion codes (official index)
Common questions about buttock s corrosion ICD-10 codes
What is the ICD-10 code for buttock s corrosion?
- T21.45 — Corrosion of unspecified degree of buttock (a header code; report a more specific subcode). More specific codes apply when the documentation supports them: T21.55, T21.65, T21.75.
What is the ICD-10 code for first degree buttock s corrosion?
- T21.55 — Corrosion of first degree of buttock (header code; choose a more specific subcode).
What is the ICD-10 code for second degree buttock s corrosion?
- T21.65 — Corrosion of second degree of buttock (header code; choose a more specific subcode).
What is the ICD-10 code for third degree buttock s corrosion?
- T21.75 — Corrosion of third degree of buttock (header code; choose a more specific subcode).
Is T21.45 billable?
- No. T21.45 is a header code. Report one of its more specific subcodes instead.