Skip to main content

T25.72 ICD-10-CM Code: Corrosion of third degree of foot

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

Coding at a Glance

7th character
Required — see the character table on this page
Tabular directives
3 inclusion terms · 1 Excludes2 · 2 use-additional codes · 1 code-first instruction

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for T25.72 in the official ICD-10-CM tabular list, quoted as published.

Notes without a marker are published on T25.72 itself; “inherited from” names the category or block whose note applies here.

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]

Source: inherited from T20-T25

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

Code First

Underlying conditions that must be sequenced before this code.

  • (T51-T65) to identify chemical and intent

Source: inherited from T25.7

Use Additional Code

Supplementary codes the tabular list directs you to add.

  • external cause code to identify place (Y92) inherited from T25.7
  • Use additional code from category T31 or T32 to identify extent of body surface involved inherited from T20-T25

7th Character Guide

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

  • A — initial encounter
  • D — subsequent encounter
  • S — sequela

How the encounter character is assigned. “Initial encounter” means the patient is receiving active treatment for the condition — it is not limited to the first visit, and a different or new provider giving active treatment still assigns it. “Subsequent encounter” covers care during the healing or recovery phase after active treatment. “Sequela” is for complications or conditions that arise as a direct result of the original condition.

ICD-10-CM Official Guidelines for Coding and Reporting, Section I.C.19.a (paraphrased by MedCoder).

Variant codes in this family

T25.721A, T25.721D, T25.721S, T25.722A, T25.722D, T25.722S, T25.729A, T25.729D

Character meanings are CMS's official 7th-character extensions for this family, as carried in each variant code's official description; variant codes are registry rows. The explanation of how the encounter character is assigned is MedCoder editorial, distinct from the official content above it.

Code Overview

Corrosion of third degree of foot is a non-billable ICD-10-CM category code (T25.72). A more specific billable subcode must be selected for claims submission.

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Decision Points

The directives on this code's own record, as a pre-claim checklist.

  1. A 7th character applies in this family. Confirm the documented encounter matches the character assigned. See the official 7th-character definitions and this code’s variants
  2. Sequencing: 1 Code First instruction — the underlying condition is sequenced before this code when present. See the Code First notes
  3. 2 Use Additional Code instructions — report the named additional code(s) when the documentation supports them. See the Use Additional Code notes
  4. 1 Excludes2 entry — those conditions are not part of this code and may be reported additionally when documented. See the Excludes2 notes

Checklist rows are derived from this code's own official directives; the wording of each check is MedCoder editorial. The official notes themselves are in the sections each row links to.

Verify Before Coding

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

Other codes that name T25.72 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 2 Excludes1 notes: T07 — Unspecified multiple injuries (via T25.-), T66 — Radiation sickness, unspecified (via T25.-).

These codes’ tabular lists mark this diagnosis as mutually exclusive — not reported together unless the conditions are documented as unrelated.

Referenced by 122 Excludes2 notes: S00 — Superficial injury of head (via T25.-), S00-S09 — Injuries to the head (S00-S09) (via T25.-), S01 — Open wound of head (via T25.-), S02 — Fracture of skull and facial bones (via T25.-), S03 — Dislocation and sprain of joints and ligaments of head (via T25.-), S04 — Injury of cranial nerve (via T25.-), S05 — Injury of eye and orbit (via T25.-), S06 — Intracranial injury (via T25.-), S07 — Crushing injury of head (via T25.-), S08 — Avulsion and traumatic amputation of part of head (via T25.-), S09 — Other and unspecified injuries of head (via T25.-), S10 — Superficial injury of neck (via T25.-), S10-S19 — Injuries to the neck (S10-S19) (via T25.-), S11 — Open wound of neck (via T25.-), S12 — Fracture of cervical vertebra and other parts of neck (via T25.-), S13 — Dislocation and sprain of joints and ligaments at neck level (via T25.-), S14 — Injury of nerves and spinal cord at neck level (via T25.-), S15 — Injury of blood vessels at neck level (via T25.-), S16 — Injury of muscle, fascia and tendon at neck level (via T25.-), S17 — Crushing injury of neck (via T25.-), +102 more.

These codes’ tabular lists name this diagnosis as distinct — both may be reported when both are documented.

Contextual Map

Every relationship of T25.72 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run T25.72 with these 11 related codes in Claim Check

Hierarchy

Excludes2

Referenced by Excludes1 notes

Referenced by Excludes2 notes (122)

Nearest codes (40)

Change history

  • FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Common coding questions

Can T25.72 be billed directly?

No. T25.72 (Corrosion of third degree of foot) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.

Does T25.72 require a 7th character?

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

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2026 tabular list, index and tables, effective October 1, 2025 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v43.1 (April 2026) Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder structured relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary and FAQ answers MedCoder explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Corrosion of third degree of foot

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027 (effective October 1, 2026), and none are recorded for this code. Note changes are tracked from FY2027 only.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to T25.72 in its code family, with their registry titles.

View all codes in the T25 family