ICD-10-CM 2027
ICD-10 code for finger corrosion
T23.429
Corrosion of unspecified degree of unspecified single finger (nail) except thumb
Header — needs a more specific code
From the official ICD-10-CM alphabetic index entry “Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal) › finger”. Page updated September 29, 2026.
About coding finger corrosion
The ICD-10-CM code for finger corrosion is T23.429 (Corrosion of unspecified degree of unspecified single finger (nail) except thumb). The official index lists 35 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on T23.429.
Within T23.42, choose T23.429 (unspecified single finger (nail) except thumb) only when documentation doesn't support a more specific option: single right finger (nail) except thumb (T23.421) and single left finger (nail) except thumb (T23.422).
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 finger corrosion codes (official index)
- first degree T23.529 — Corrosion of first degree of unspecified single finger (nail) except thumb
- left T23.422 — Corrosion of unspecified degree of single left finger (nail) except thumb
- first degree T23.522 — Corrosion of first degree of single left finger (nail) except thumb
- second degree T23.622 — Corrosion of second degree of single left finger (nail) except thumb
- third degree T23.722 — Corrosion of third degree of single left finger (nail) except thumb
- multiple sites (without thumb) T23.439 — Corrosion of unspecified degree of unspecified multiple fingers (nail), not including thumb
- with thumb T23.449 — Corrosion of unspecified degree of unspecified multiple fingers (nail), including thumb
- first degree T23.549 — Corrosion of first degree of unspecified multiple fingers (nail), including thumb
- left T23.442 — Corrosion of unspecified degree of multiple left fingers (nail), including thumb
- first degree T23.542 — Corrosion of first degree of multiple left fingers (nail), including thumb
- second degree T23.642 — Corrosion of second degree of multiple left fingers (nail), including thumb
- third degree T23.742 — Corrosion of third degree of multiple left fingers (nail), including thumb
- right T23.441 — Corrosion of unspecified degree of multiple right fingers (nail), including thumb
- first degree T23.541 — Corrosion of first degree of multiple right fingers (nail), including thumb
- second degree T23.641 — Corrosion of second degree of multiple right fingers (nail), including thumb
- third degree T23.741 — Corrosion of third degree of multiple right fingers (nail), including thumb
- second degree T23.649 — Corrosion of second degree of unspecified multiple fingers (nail), including thumb
- third degree T23.749 — Corrosion of third degree of unspecified multiple fingers (nail), including thumb
- first degree T23.539 — Corrosion of first degree of unspecified multiple fingers (nail), not including thumb
- left T23.432 — Corrosion of unspecified degree of multiple left fingers (nail), not including thumb
- first degree T23.532 — Corrosion of first degree of multiple left fingers (nail), not including thumb
- second degree T23.632 — Corrosion of second degree of multiple left fingers (nail), not including thumb
- third degree T23.732 — Corrosion of third degree of multiple left fingers (nail), not including thumb
- right T23.431 — Corrosion of unspecified degree of multiple right fingers (nail), not including thumb
- first degree T23.531 — Corrosion of first degree of multiple right fingers (nail), not including thumb
- second degree T23.631 — Corrosion of second degree of multiple right fingers (nail), not including thumb
- third degree T23.731 — Corrosion of third degree of multiple right fingers (nail), not including thumb
- second degree T23.639 — Corrosion of second degree of unspecified multiple fingers (nail), not including thumb
- third degree T23.739 — Corrosion of third degree of unspecified multiple fingers (nail), not including thumb
- right T23.421 — Corrosion of unspecified degree of single right finger (nail) except thumb
- first degree T23.521 — Corrosion of first degree of single right finger (nail) except thumb
- second degree T23.621 — Corrosion of second degree of single right finger (nail) except thumb
- third degree T23.721 — Corrosion of third degree of single right finger (nail) except thumb
- second degree T23.629 — Corrosion of second degree of unspecified single finger (nail) except thumb
- third degree T23.729 — Corrosion of third degree of unspecified single finger (nail) except thumb
Common questions about finger corrosion ICD-10 codes
What is the ICD-10 code for finger corrosion?
- T23.429 — Corrosion of unspecified degree of unspecified single finger (nail) except thumb (a header code; report a more specific subcode). More specific codes apply when the documentation supports them: T23.529, T23.422, T23.522, T23.622 and others below.
What is the ICD-10 code for first degree finger corrosion?
- T23.529 — Corrosion of first degree of unspecified single finger (nail) except thumb (header code; choose a more specific subcode).
What is the ICD-10 code for left finger corrosion?
- T23.422 — Corrosion of unspecified degree of single left finger (nail) except thumb (header code; choose a more specific subcode).
What is the ICD-10 code for multiple sites finger corrosion?
- T23.439 — Corrosion of unspecified degree of unspecified multiple fingers (nail), not including thumb (header code; choose a more specific subcode).
What is the ICD-10 code for right finger corrosion?
- T23.421 — Corrosion of unspecified degree of single right finger (nail) except thumb (header code; choose a more specific subcode).
What is the ICD-10 code for second degree finger corrosion?
- T23.629 — Corrosion of second degree of unspecified single finger (nail) except thumb (header code; choose a more specific subcode).
What is the ICD-10 code for third degree finger corrosion?
- T23.729 — Corrosion of third degree of unspecified single finger (nail) except thumb (header code; choose a more specific subcode).
Is T23.429 billable?
- No. T23.429 is a header code. Report one of its more specific subcodes instead.