T25.439Header code — not billable
Corrosion of unspecified degree of unspecified toe(s) (nail)
- Chapter
- 19. Injury, poisoning and certain other consequences of external causes
- Category
- T25
- Effective date
- October 1, 2026
Related codes in category T25
T25Burn and corrosion of ankle and footT25.0Burn of unspecified degree of ankle and footT25.01Burn of unspecified degree of ankleT25.011Burn of unspecified degree of right ankleT25.011ABurn of unspecified degree of right ankle, initial encounterYesT25.011DBurn of unspecified degree of right ankle, subs encntrYesT25.011SBurn of unspecified degree of right ankle, sequelaYesT25.012Burn of unspecified degree of left ankleT25.012ABurn of unspecified degree of left ankle, initial encounterYesT25.012DBurn of unspecified degree of left ankle, subs encntrYesT25.012SBurn of unspecified degree of left ankle, sequelaYesT25.019Burn of unspecified degree of unspecified ankle
Frequently asked questions
What is ICD-10 code T25.439?
T25.439 is an ICD-10-CM diagnosis code for Corrosion of unspecified degree of unspecified toe(s) (nail).
Is T25.439 a billable code?
No. T25.439 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is T25.439 in?
T25.439 falls under Chapter 19: Injury, poisoning and certain other consequences of external causes.
When did T25.439 become effective?
T25.439 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to T25.439?
T25.439 belongs to category T25, which includes 12 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.