ICD-10-CM diagnosis code
T25.639A Corrosion of second degree of unspecified toe(s) (nail), initial encounter
- Billable
- Yes, a complete code (FY2026)
Encounter (7th character)
This code is for the initial encounter: the patient is receiving active treatment for the condition (for example surgery, an emergency department visit or evaluation by a new clinician).
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Other codes in T25
288 complete codes in this category.
- T25.631ACorrosion of second degree of right toe(s) (nail), initial encounter
- T25.631DCorrosion of second degree of right toe(s) (nail), subsequent encounter
- T25.631SCorrosion of second degree of right toe(s) (nail), sequela
- T25.632ACorrosion of second degree of left toe(s) (nail), initial encounter
- T25.632DCorrosion of second degree of left toe(s) (nail), subsequent encounter
- T25.632SCorrosion of second degree of left toe(s) (nail), sequela
- T25.639ACorrosion of second degree of unspecified toe(s) (nail), initial encounter
- T25.639DCorrosion of second degree of unspecified toe(s) (nail), subsequent encounter
- T25.639SCorrosion of second degree of unspecified toe(s) (nail), sequela
- T25.691ACorrosion of second degree of right ankle and foot, initial encounter
- T25.691DCorrosion of second degree of right ankle and foot, subsequent encounter
- T25.691SCorrosion of second degree of right ankle and foot, sequela
Documentation tips
- Make sure the note supports every element of the title, “Corrosion of second degree of unspecified toe(s) (nail), initial encounter”: each detail in it should be traceable to the history, examination or assessment.
- Code to the highest specificity the documentation supports. If a detail is missing from the note, add it to the note rather than choosing a less specific code by default.
- Check the Tabular List and official guidelines for instructional notes (“code first”, “use additional code”, Excludes1/Excludes2) that apply to T25.
The international WHO ICD-10 also has T25, with its inclusion and exclusion notes; titles and detail can differ from ICD-10-CM.
ICD-10-CM is developed by the National Center for Health Statistics (NCHS), Centers for Disease Control and Prevention, U.S. Department of Health and Human Services, and is based on the WHO ICD-10. Codes and titles are reproduced unchanged from the FY2026 code list (effective 1 October 2025). Their use here does not imply endorsement by CDC, HHS or the U.S. Government. Changes effective on or after 1 October 2026 may not be reflected yet; check the current release at cdc.gov or cms.gov before submitting claims.
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