2026 ICD-10-CM Diagnosis Code T24Burn and corrosion of lower limb, except ankle and foot

ICD-10-CM Codes›S00–T88›T20-T25›T24

ICD-10-CM T24
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T24 is a non-billable ICD-10-CM category code for burn and corrosion of lower limb, except ankle and foot, so it cannot be submitted on claims. Use a more specific code from this category instead, such as T24.001A, T24.001D, T24.001S, and T24.002A.

Code Identity

ICD-10-CM Code
T24
Billable Status
No — Non-Billable Category
Code Describes
Burn and corrosion of lower limb, except ankle and foot
Short Description
Burn and corrosion of lower limb, except ankle and foot
Same as the full description in the CMS dataset.
Chapter
T20-T25
Burns and corrosions of external body surface, specified by site

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT20-T25Burns and corrosions of external body surface, specified by site
CategoryT24Burn and corrosion of lower limb, except ankle and foot
This CodeT24Burn and corrosion of lower limb, except ankle and foot

Specific Coding for Burn and corrosion of lower limb, except ankle and footOverview

Non-specific codes like T24 require more characters. Use one of these billable codes instead:

  • T24.0 for Burn of unspecified degree of lower limb, except ankle and foot

  • T24.00 for Burn of unspecified degree of unspecified site of lower limb, except ankle and foot

  • T24.01 for Burn of unspecified degree of thigh

  • T24.02 for Burn of unspecified degree of knee

  • T24.03 for Burn of unspecified degree of lower leg

  • T24.09 for Burn of unspecified degree of multiple sites of lower limb, except ankle and foot

  • T24.1 for Burn of first degree of lower limb, except ankle and foot

  • T24.10 for Burn of first degree of unspecified site of lower limb, except ankle and foot

  • T24.11 for Burn of first degree of thigh

  • T24.12 for Burn of first degree of knee

  • T24.13 for Burn of first degree of lower leg

  • T24.19 for Burn of first degree of multiple sites of lower limb, except ankle and foot

  • T24.2 for Burn of second degree of lower limb, except ankle and foot

  • T24.20 for Burn of second degree of unspecified site of lower limb, except ankle and foot

  • T24.21 for Burn of second degree of thigh

  • T24.22 for Burn of second degree of knee

  • T24.23 for Burn of second degree of lower leg

  • T24.29 for Burn of second degree of multiple sites of lower limb, except ankle and foot

  • T24.3 for Burn of third degree of lower limb, except ankle and foot

  • T24.30 for Burn of third degree of unspecified site of lower limb, except ankle and foot

  • T24.31 for Burn of third degree of thigh

  • T24.32 for Burn of third degree of knee

  • T24.33 for Burn of third degree of lower leg

  • T24.39 for Burn of third degree of multiple sites of lower limb, except ankle and foot

  • T24.4 for Corrosion of unspecified degree of lower limb, except ankle and foot

  • T24.40 for Corrosion of unspecified degree of unspecified site of lower limb, except ankle and foot

  • T24.41 for Corrosion of unspecified degree of thigh

  • T24.42 for Corrosion of unspecified degree of knee

  • T24.43 for Corrosion of unspecified degree of lower leg

  • T24.49 for Corrosion of unspecified degree of multiple sites of lower limb, except ankle and foot

  • T24.5 for Corrosion of first degree of lower limb, except ankle and foot

  • T24.50 for Corrosion of first degree of unspecified site of lower limb, except ankle and foot

  • T24.51 for Corrosion of first degree of thigh

  • T24.52 for Corrosion of first degree of knee

  • T24.53 for Corrosion of first degree of lower leg

  • T24.59 for Corrosion of first degree of multiple sites of lower limb, except ankle and foot

  • T24.6 for Corrosion of second degree of lower limb, except ankle and foot

  • T24.60 for Corrosion of second degree of unspecified site of lower limb, except ankle and foot

  • T24.61 for Corrosion of second degree of thigh

  • T24.62 for Corrosion of second degree of knee

  • T24.63 for Corrosion of second degree of lower leg

  • T24.69 for Corrosion of second degree of multiple sites of lower limb, except ankle and foot

  • T24.7 for Corrosion of third degree of lower limb, except ankle and foot

  • T24.70 for Corrosion of third degree of unspecified site of lower limb, except ankle and foot

  • T24.71 for Corrosion of third degree of thigh

  • T24.72 for Corrosion of third degree of knee

  • T24.73 for Corrosion of third degree of lower leg

  • T24.79 for Corrosion of third degree of multiple sites of lower limb, except 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 lower limb, except ankle and foot (T24). 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.

Type 2 Excludes

  • burn and corrosion of ankle and foot T25
  • burn and corrosion of hip region T21

7th Character Note

  • The appropriate 7th character is to be added to each code from category T24

7th Character

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

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

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About T24Overview

Is T24 (Burn and corrosion of lower limb, except ankle and foot) a billable code?

No. This is a category header that groups the codes for burn and corrosion of lower limb, except ankle and foot, and headers cannot be submitted on claims. Claims for burn and corrosion of lower limb, except ankle and foot need a more specific code from this category, such as T24.001A, T24.001D, and T24.001S.