ICD-10-CM 2027
ICD-10 code for foot corrosion
From the official ICD-10-CM alphabetic index entry “Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal) › foot”. Page updated September 29, 2026.
About coding foot corrosion
The ICD-10-CM code for foot corrosion is T25.429 (Corrosion of unspecified degree of unspecified foot). The official index lists 11 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on T25.429.
Within T25.42, choose T25.429 (unspecified foot) only when documentation doesn't support a more specific option: right foot (T25.421) and left foot (T25.422).
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 foot corrosion codes (official index)
- first degree T25.529 — Corrosion of first degree of unspecified foot
- left T25.422 — Corrosion of unspecified degree of left foot
- first degree T25.522 — Corrosion of first degree of left foot
- second degree T25.622 — Corrosion of second degree of left foot
- third degree T25.722 — Corrosion of third degree of left foot
- multiple with ankle
- right T25.421 — Corrosion of unspecified degree of right foot
- first degree T25.521 — Corrosion of first degree of right foot
- second degree T25.621 — Corrosion of second degree of right foot
- third degree T25.721 — Corrosion of third degree of right foot
- second degree T25.629 — Corrosion of second degree of unspecified foot
- third degree T25.729 — Corrosion of third degree of unspecified foot
Common questions about foot corrosion ICD-10 codes
What is the ICD-10 code for foot corrosion?
- T25.429 — Corrosion of unspecified degree of unspecified foot (a header code; report a more specific subcode). More specific codes apply when the documentation supports them: T25.529, T25.422, T25.522, T25.622 and others below.
What is the ICD-10 code for first degree foot corrosion?
- T25.529 — Corrosion of first degree of unspecified foot (header code; choose a more specific subcode).
What is the ICD-10 code for left foot corrosion?
- T25.422 — Corrosion of unspecified degree of left foot (header code; choose a more specific subcode).
What is the ICD-10 code for right foot corrosion?
- T25.421 — Corrosion of unspecified degree of right foot (header code; choose a more specific subcode).
What is the ICD-10 code for second degree foot corrosion?
- T25.629 — Corrosion of second degree of unspecified foot (header code; choose a more specific subcode).
What is the ICD-10 code for third degree foot corrosion?
- T25.729 — Corrosion of third degree of unspecified foot (header code; choose a more specific subcode).
Is T25.429 billable?
- No. T25.429 is a header code. Report one of its more specific subcodes instead.