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ICD-10/T25.41

T25.41 ICD-10-CM Code: Corrosion of unspecified degree of ankle

Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.

Code Set: Valid FY2026 and FY2027. FY2026 took effect October 1, 2025.

Official Registry Overview & Definition

Corrosion of unspecified degree of ankle is a non-billable ICD-10-CM category code (T25.41). A more specific billable subcode must be selected for claims submission.

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for T25.41 in the official ICD-10-CM tabular list.

Includes

Conditions the official ICD-10-CM tabular list includes under this code.

  • burns and corrosions of first degree [erythema]
  • burns and corrosions of second degree [blisters][epidermal loss]
  • burns and corrosions of third degree [deep necrosis of underlying tissue] [full- thickness skin loss]

Code First

Underlying conditions that must be sequenced before this code.

  • (T51-T65) to identify chemical and intent

Use Additional Code

Supplementary codes the tabular list directs you to add.

  • external cause code to identify place (Y92)
  • Use additional code from category T31 or T32 to identify extent of body surface involved

Frequently Asked Questions (FAQ) & Clinical Guidance

Can T25.41 be billed directly?

No. T25.41 (Corrosion of unspecified degree of ankle) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.

Does T25.41 require a 7th character?

Yes. The appropriate 7th character is to be added to each code from category T25.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to T25.41 in its code family, with their registry titles.

  • T25.399 — Burn of third degree of multiple sites of unspecified ankle and foot
  • T25.399A — Burn of third degree of multiple sites of unspecified ankle and foot, initial encounter
  • T25.399D — Burn of third degree of multiple sites of unspecified ankle and foot, subsequent encounter
  • T25.399S — Burn of third degree of multiple sites of unspecified ankle and foot, sequela
  • T25.4 — Corrosion of unspecified degree of ankle and foot
  • T25.411 — Corrosion of unspecified degree of right ankle
  • T25.411A — Corrosion of unspecified degree of right ankle, initial encounter
  • T25.411D — Corrosion of unspecified degree of right ankle, subsequent encounter
  • T25.411S — Corrosion of unspecified degree of right ankle, sequela
  • T25.412 — Corrosion of unspecified degree of left ankle

View all codes in the T25 family