ICD-10-CM 2027
ICD-10 code for thumb s corrosion
Corrosion of unspecified degree of unspecified thumb (nail)
From the official ICD-10-CM alphabetic index entry “Corrosion (injury) (acid) (caustic) (chemical) (lime) (external) (internal) › thumb (s)”. Page updated September 29, 2026.
About coding thumb s corrosion
The ICD-10-CM code for thumb s corrosion is T23.419 (Corrosion of unspecified degree of unspecified thumb (nail)). The official index lists 23 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on T23.419.
Within T23.41, choose T23.419 (unspecified thumb (nail)) only when documentation doesn't support a more specific option: right thumb (nail) (T23.411) and left thumb (nail) (T23.412).
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 thumb s corrosion codes (official index)
- first degree T23.519 — Corrosion of first degree of unspecified thumb (nail)
- left T23.412 — Corrosion of unspecified degree of left thumb (nail)
- first degree T23.512 — Corrosion of first degree of left thumb (nail)
- second degree T23.612 — Corrosion of second degree of left thumb (nail)
- third degree T23.712 — Corrosion of third degree of left thumb (nail)
- multiple sites with fingers 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
- right T23.411 — Corrosion of unspecified degree of right thumb (nail)
- first degree T23.511 — Corrosion of first degree of right thumb (nail)
- second degree T23.611 — Corrosion of second degree of right thumb (nail)
- third degree T23.711 — Corrosion of third degree of right thumb (nail)
- second degree T23.619 — Corrosion of second degree of unspecified thumb (nail)
- third degree T23.719 — Corrosion of third degree of unspecified thumb (nail)
Common questions about thumb s corrosion ICD-10 codes
What is the ICD-10 code for thumb s corrosion?
- T23.419 — Corrosion of unspecified degree of unspecified thumb (nail) (a header code; report a more specific subcode). More specific codes apply when the documentation supports them: T23.519, T23.412, T23.512, T23.612 and others below.
What is the ICD-10 code for first degree thumb s corrosion?
- T23.519 — Corrosion of first degree of unspecified thumb (nail) (header code; choose a more specific subcode).
What is the ICD-10 code for left thumb s corrosion?
- T23.412 — Corrosion of unspecified degree of left thumb (nail) (header code; choose a more specific subcode).
What is the ICD-10 code for multiple sites with fingers thumb s corrosion?
- T23.449 — Corrosion of unspecified degree of unspecified multiple fingers (nail), including thumb (header code; choose a more specific subcode).
What is the ICD-10 code for right thumb s corrosion?
- T23.411 — Corrosion of unspecified degree of right thumb (nail) (header code; choose a more specific subcode).
What is the ICD-10 code for second degree thumb s corrosion?
- T23.619 — Corrosion of second degree of unspecified thumb (nail) (header code; choose a more specific subcode).
What is the ICD-10 code for third degree thumb s corrosion?
- T23.719 — Corrosion of third degree of unspecified thumb (nail) (header code; choose a more specific subcode).
Is T23.419 billable?
- No. T23.419 is a header code. Report one of its more specific subcodes instead.