2026 ICD-10-CM Diagnosis Code T31Burns classified according to extent of body surface involved

ICD-10-CM Codes›S00–T88›T30-T32›T31

ICD-10-CM T31
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T31 is a non-billable ICD-10-CM category code for burns classified according to extent of body surface involved, so it cannot be submitted on claims. Use a more specific code from this category instead, such as T31.0, T31.10, T31.11, and T31.20.

Code Identity

ICD-10-CM Code
T31
Billable Status
No — Non-Billable Category
Code Describes
Burns classified according to extent of body surface involved
Chapter
T30-T32
Burns and corrosions of multiple and unspecified body regions

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT30-T32Burns and corrosions of multiple and unspecified body regions
CategoryT31Burns classified according to extent of body surface involved
This CodeT31Burns classified according to extent of body surface involved

Specific Coding for Burns classified accord extent body involvOverview

Non-specific codes like T31 require more characters. Use one of these billable codes instead:

  • Use T31.0 for Burns involving less than 10% of body surface

  • T31.1 for Burns involving 10-19% of body surface

  • Use T31.10 for Burns involving 10-19% of body surface with 0% to 9% third degree burns

  • Use T31.11 for Burns involving 10-19% of body surface with 10-19% third degree burns

  • T31.2 for Burns involving 20-29% of body surface

  • Use T31.20 for Burns involving 20-29% of body surface with 0% to 9% third degree burns

  • Use T31.21 for Burns involving 20-29% of body surface with 10-19% third degree burns

  • Use T31.22 for Burns involving 20-29% of body surface with 20-29% third degree burns

  • T31.3 for Burns involving 30-39% of body surface

  • Use T31.30 for Burns involving 30-39% of body surface with 0% to 9% third degree burns

  • Use T31.31 for Burns involving 30-39% of body surface with 10-19% third degree burns

  • Use T31.32 for Burns involving 30-39% of body surface with 20-29% third degree burns

  • Use T31.33 for Burns involving 30-39% of body surface with 30-39% third degree burns

  • T31.4 for Burns involving 40-49% of body surface

  • Use T31.40 for Burns involving 40-49% of body surface with 0% to 9% third degree burns

  • Use T31.41 for Burns involving 40-49% of body surface with 10-19% third degree burns

  • Use T31.42 for Burns involving 40-49% of body surface with 20-29% third degree burns

  • Use T31.43 for Burns involving 40-49% of body surface with 30-39% third degree burns

  • Use T31.44 for Burns involving 40-49% of body surface with 40-49% third degree burns

  • T31.5 for Burns involving 50-59% of body surface

  • Use T31.50 for Burns involving 50-59% of body surface with 0% to 9% third degree burns

  • Use T31.51 for Burns involving 50-59% of body surface with 10-19% third degree burns

  • Use T31.52 for Burns involving 50-59% of body surface with 20-29% third degree burns

  • Use T31.53 for Burns involving 50-59% of body surface with 30-39% third degree burns

  • Use T31.54 for Burns involving 50-59% of body surface with 40-49% third degree burns

  • Use T31.55 for Burns involving 50-59% of body surface with 50-59% third degree burns

  • T31.6 for Burns involving 60-69% of body surface

  • Use T31.60 for Burns involving 60-69% of body surface with 0% to 9% third degree burns

  • Use T31.61 for Burns involving 60-69% of body surface with 10-19% third degree burns

  • Use T31.62 for Burns involving 60-69% of body surface with 20-29% third degree burns

  • Use T31.63 for Burns involving 60-69% of body surface with 30-39% third degree burns

  • Use T31.64 for Burns involving 60-69% of body surface with 40-49% third degree burns

  • Use T31.65 for Burns involving 60-69% of body surface with 50-59% third degree burns

  • Use T31.66 for Burns involving 60-69% of body surface with 60-69% third degree burns

  • T31.7 for Burns involving 70-79% of body surface

  • Use T31.70 for Burns involving 70-79% of body surface with 0% to 9% third degree burns

  • Use T31.71 for Burns involving 70-79% of body surface with 10-19% third degree burns

  • Use T31.72 for Burns involving 70-79% of body surface with 20-29% third degree burns

  • Use T31.73 for Burns involving 70-79% of body surface with 30-39% third degree burns

  • Use T31.74 for Burns involving 70-79% of body surface with 40-49% third degree burns

  • Use T31.75 for Burns involving 70-79% of body surface with 50-59% third degree burns

  • Use T31.76 for Burns involving 70-79% of body surface with 60-69% third degree burns

  • Use T31.77 for Burns involving 70-79% of body surface with 70-79% third degree burns

  • T31.8 for Burns involving 80-89% of body surface

  • Use T31.80 for Burns involving 80-89% of body surface with 0% to 9% third degree burns

  • Use T31.81 for Burns involving 80-89% of body surface with 10-19% third degree burns

  • Use T31.82 for Burns involving 80-89% of body surface with 20-29% third degree burns

  • Use T31.83 for Burns involving 80-89% of body surface with 30-39% third degree burns

  • Use T31.84 for Burns involving 80-89% of body surface with 40-49% third degree burns

  • Use T31.85 for Burns involving 80-89% of body surface with 50-59% third degree burns

  • Use T31.86 for Burns involving 80-89% of body surface with 60-69% third degree burns

  • Use T31.87 for Burns involving 80-89% of body surface with 70-79% third degree burns

  • Use T31.88 for Burns involving 80-89% of body surface with 80-89% third degree burns

  • T31.9 for Burns involving 90% or more of body surface

  • Use T31.90 for Burns involving 90% or more of body surface with 0% to 9% third degree burns

  • Use T31.91 for Burns involving 90% or more of body surface with 10-19% third degree burns

  • Use T31.92 for Burns involving 90% or more of body surface with 20-29% third degree burns

  • Use T31.93 for Burns involving 90% or more of body surface with 30-39% third degree burns

  • Use T31.94 for Burns involving 90% or more of body surface with 40-49% third degree burns

  • Use T31.95 for Burns involving 90% or more of body surface with 50-59% third degree burns

  • Use T31.96 for Burns involving 90% or more of body surface with 60-69% third degree burns

  • Use T31.97 for Burns involving 90% or more of body surface with 70-79% third degree burns

  • Use T31.98 for Burns involving 90% or more of body surface with 80-89% third degree burns

  • Use T31.99 for Burns involving 90% or more of body surface with 90% or more third degree burns

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.

Assign codes from category T31, Burns classified according to extent of body surface involved, or T32, Corrosions classified according to extent of body surface involved, when the site of the burn is not specified or when there is a need for additional data. It is advisable to use category T31 as additional coding when needed to provide data for evaluating burn mortality, such as that needed by burn units. It is also advisable to use category T31 as an additional code for reporting purposes when there is mention of a third-degree burn involving 20 percent or more of the body surface.

Categories T31 and T32 are based on the classic "rule of nines" in estimating body surface involved: head and neck are assigned nine percent, each arm nine percent, each leg 18 percent, the anterior trunk 18 percent, posterior trunk 18 percent, and genitalia one percent. Providers may change these percentage assignments where necessary to accommodate infants and children who have proportionately larger heads than adults, and patients who have large buttocks, thighs, or abdomen that involve burns.

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.

  • This category is to be used as the primary code only when the site of the burn is unspecified. It should be used as a supplementary code with categories T20 T25

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 T31Overview

Is T31 a billable code?

No. This is a category header that groups the codes for burns classified according to extent of body surface involved, and headers cannot be submitted on claims. Claims for burns classified according to extent of body surface involved need a more specific code from this category, such as T31.0, T31.10, and T31.11.