T31 Burns classified according to extent of body surface involved

⚠ Non-Billable ICD-10-CM 2026
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The ICD-10-CM code for Burns classified according to extent of body surface involved is T31 (FY2026). It is a non-billable category code — select a more specific code below for claims.

Classification

Section
T30-T32: Burns and corrosions of multiple and unspecified body regions (T30-T32)
Category T31
65 codes (55 billable)
FY2026 Status
Stable since FY2024

Notes

  • 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 when the site is specified.

Official Coding Guidelines

Use T31/T32 for extent of body surface; rule of nines; not for sequelae

6) Burns and corrosions classified according to extent of body surface involved 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, for acute burns or corrosions when the site of the burn or corrosion 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. Codes from categories T31 and T32 should not be used for sequelae of burns or corrosions. 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

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.19.d.6
Sequence blood vessel/nerve injury first (fragment)

injury is to the blood vessels or nerves, that injury should be sequenced first.

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.19.b.2

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

Related Codes

More Specific Codes

T31.0 Burns involving less than 10% of body surface T31.1 Burns involving 10-19% of body surface T31.10 Burns involving 10-19% of body surface with 0% to 9% third degree burns T31.11 Burns involving 10-19% of body surface with 10-19% third degree burns T31.2 Burns involving 20-29% of body surface T31.20 Burns involving 20-29% of body surface with 0% to 9% third degree burns T31.21 Burns involving 20-29% of body surface with 10-19% third degree burns T31.22 Burns involving 20-29% of body surface with 20-29% third degree burns T31.3 Burns involving 30-39% of body surface T31.30 Burns involving 30-39% of body surface with 0% to 9% third degree burns T31.31 Burns involving 30-39% of body surface with 10-19% third degree burns T31.32 Burns involving 30-39% of body surface with 20-29% third degree burns T31.33 Burns involving 30-39% of body surface with 30-39% third degree burns T31.4 Burns involving 40-49% of body surface T31.40 Burns involving 40-49% of body surface with 0% to 9% third degree burns T31.41 Burns involving 40-49% of body surface with 10-19% third degree burns T31.42 Burns involving 40-49% of body surface with 20-29% third degree burns T31.43 Burns involving 40-49% of body surface with 30-39% third degree burns T31.44 Burns involving 40-49% of body surface with 40-49% third degree burns T31.5 Burns involving 50-59% of body surface T31.50 Burns involving 50-59% of body surface with 0% to 9% third degree burns T31.51 Burns involving 50-59% of body surface with 10-19% third degree burns T31.52 Burns involving 50-59% of body surface with 20-29% third degree burns T31.53 Burns involving 50-59% of body surface with 30-39% third degree burns T31.54 Burns involving 50-59% of body surface with 40-49% third degree burns T31.55 Burns involving 50-59% of body surface with 50-59% third degree burns T31.6 Burns involving 60-69% of body surface T31.60 Burns involving 60-69% of body surface with 0% to 9% third degree burns T31.61 Burns involving 60-69% of body surface with 10-19% third degree burns T31.62 Burns involving 60-69% of body surface with 20-29% third degree burns

Related Codes in T31

T31.0 Burns involving less than 10% of body surface T31.1 Burns involving 10-19% of body surface T31.10 Burns involving 10-19% of body surface with 0% to 9% third degree burns T31.11 Burns involving 10-19% of body surface with 10-19% third degree burns T31.2 Burns involving 20-29% of body surface T31.20 Burns involving 20-29% of body surface with 0% to 9% third degree burns T31.21 Burns involving 20-29% of body surface with 10-19% third degree burns T31.22 Burns involving 20-29% of body surface with 20-29% third degree burns T31.3 Burns involving 30-39% of body surface T31.30 Burns involving 30-39% of body surface with 0% to 9% third degree burns T31.31 Burns involving 30-39% of body surface with 10-19% third degree burns T31.32 Burns involving 30-39% of body surface with 20-29% third degree burns T31.33 Burns involving 30-39% of body surface with 30-39% third degree burns T31.4 Burns involving 40-49% of body surface T31.40 Burns involving 40-49% of body surface with 0% to 9% third degree burns T31.41 Burns involving 40-49% of body surface with 10-19% third degree burns T31.42 Burns involving 40-49% of body surface with 20-29% third degree burns T31.43 Burns involving 40-49% of body surface with 30-39% third degree burns T31.44 Burns involving 40-49% of body surface with 40-49% third degree burns T31.5 Burns involving 50-59% of body surface
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Reviewed by Prajwal Shrestha, CPC, CRC
Certified Professional Coder (CPC) and Certified Risk Adjustment Coder (CRC) · AAPC Member ID 01997614 · About · Editorial policy · Content last reviewed: 2025-10-01

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