2026 ICD-10-CM Diagnosis Code T25Burn and corrosion of ankle and foot
T25 is a non-billable ICD-10-CM category code for burn and corrosion of ankle and foot, so it cannot be submitted on claims. Use a more specific code from this category instead, such as T25.011A, T25.011D, T25.011S, and T25.012A.
Code Identity
Code Classification
Specific Coding for Burn and corrosion of ankle and footOverview
Non-specific codes like T25 require more characters. Use one of these billable codes instead:
T25.0 for Burn of unspecified degree of ankle and foot
T25.01 for Burn of unspecified degree of ankle
T25.02 for Burn of unspecified degree of foot
T25.03 for Burn of unspecified degree of toe(s) (nail)
T25.09 for Burn of unspecified degree of multiple sites of ankle and foot
T25.1 for Burn of first degree of ankle and foot
T25.11 for Burn of first degree of ankle
T25.12 for Burn of first degree of foot
T25.13 for Burn of first degree of toe(s) (nail)
T25.19 for Burn of first degree of multiple sites of ankle and foot
T25.2 for Burn of second degree of ankle and foot
T25.21 for Burn of second degree of ankle
T25.22 for Burn of second degree of foot
T25.23 for Burn of second degree of toe(s) (nail)
T25.29 for Burn of second degree of multiple sites of ankle and foot
T25.3 for Burn of third degree of ankle and foot
T25.31 for Burn of third degree of ankle
T25.32 for Burn of third degree of foot
T25.33 for Burn of third degree of toe(s) (nail)
T25.39 for Burn of third degree of multiple sites of ankle and foot
T25.4 for Corrosion of unspecified degree of ankle and foot
T25.41 for Corrosion of unspecified degree of ankle
T25.42 for Corrosion of unspecified degree of foot
T25.43 for Corrosion of unspecified degree of toe(s) (nail)
T25.49 for Corrosion of unspecified degree of multiple sites of ankle and foot
T25.5 for Corrosion of first degree of ankle and foot
T25.51 for Corrosion of first degree of ankle
T25.52 for Corrosion of first degree of foot
T25.53 for Corrosion of first degree of toe(s) (nail)
T25.59 for Corrosion of first degree of multiple sites of ankle and foot
T25.6 for Corrosion of second degree of ankle and foot
T25.61 for Corrosion of second degree of ankle
T25.62 for Corrosion of second degree of foot
T25.63 for Corrosion of second degree of toe(s) (nail)
T25.69 for Corrosion of second degree of multiple sites of ankle and foot
T25.7 for Corrosion of third degree of ankle and foot
T25.71 for Corrosion of third degree of ankle
T25.72 for Corrosion of third degree of foot
T25.73 for Corrosion of third degree of toe(s) (nail)
T25.79 for Corrosion of third degree of multiple sites of ankle and foot
Coding GuidelinesGuidance
The ICD-10-CM makes a distinction between burns and corrosions. The burn codes are for thermal burns, except sunburns, that come from a heat source, such as a fire or hot appliance. The burn codes are also for burns resulting from electricity and radiation. Corrosions are burns due to chemicals. The guidelines are the same for burns and corrosions.
Sequence first the code that reflects the highest degree of burn when more than one burn is present.
- When the reason for the admission or encounter is for treatment of external multiple burns, sequence first the code that reflects the burn of the highest degree.
- When a patient has both internal and external burns, the circumstances of admission govern the selection of the principal diagnosis or first-listed diagnosis.
- When a patient is admitted for burn injuries and other related conditions such as smoke inhalation and/or respiratory failure, the circumstances of admission govern the selection of the principal or first-listed diagnosis.
Current burns (T20-T25) are classified by depth, extent and by agent (X code). Burns are classified by depth as first degree (erythema), second degree (blistering), and third degree (full-thickness involvement).
Classify burns of the same local site (three-character category level, T20-T28) but of different degrees to the subcategory identifying the highest degree recorded in the diagnosis.
The appropriate 7th character is to be added to each code from block Burn and corrosion of ankle and foot (T25). Use the following options for the applicable episode of care:
- A - initial encounter
- D - subsequent encounter
- S - sequela
Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
7th Character Note
- The appropriate 7th character is to be added to each code from category T25
7th Character
- A - initial encounter
- D - subsequent encounter
- S - sequela
Certain ICD-10-CM categories have applicable 7th characters. The applicable 7th character is required for all codes within the category, or as the notes in the Tabular List instruct. The 7th character must always be the 7th character in the data field. If a code that requires a 7th character is not 6 characters, a placeholder X must be used to fill in the empty characters.
Indicates that a seventh character is to be assigned to codes in a subcategory.
Patient EducationClinical
Burns
A burn is damage to your body's tissues caused by heat, chemicals, electricity, sunlight, or radiation. Scalds from hot liquids and steam, building fires and flammable liquids and gases are the most common causes of burns. Another kind is an inhalation injury, caused by breathing smoke.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Code HistoryHistory
Questions About T25Overview
Is T25 (Burn and corrosion of ankle and foot) a billable code?
No. This is a category header that groups the codes for burn and corrosion of ankle and foot, and headers cannot be submitted on claims. Claims for burn and corrosion of ankle and foot need a more specific code from this category, such as T25.011A, T25.011D, and T25.011S.
