T31.9
Burns involving 90% or more of body surface
T31.9 is a non-billable ICD-10-CM code header for burns involving 90% or more of body surface. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are T31.90 Burns involving 90% or more of body surface with 0% to 9% third degree burns, T31.91 Burns involving 90% or more of body surface with 10-19% third degree burns, T31.92 Burns involving 90% or more of body surface with 20-29% third degree burns, T31.93 Burns involving 90% or more of body surface with 30-39% third degree burns and 6 more. Its coding notes include a Use additional code instruction and 2 Excludes2 entries.
Guidelines tips
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
The 7th character depends on whether the patient is in active treatment, not on who sees the patient. An aftercare Z code is not used for injury aftercare.
T31 and T32 are used for acute burns when the site is not specified or additional data is needed, and not for sequelae.
Use additional code
Add the listed code as a secondary code, if known.
Also from chapter/block level (1 note)
- code to identify any retained foreign body, if applicable (Z18.-)
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Also from chapter/block level (2 notes)
- birth trauma (P10-P15)
- obstetric trauma (O70-O71)
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.
Also from chapter/block level (2 notes)
- Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
- The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.
More specific codes under T31.9 10
- T31.90Burns involving 90% or more of body surface with 0% to 9% third degree burnsBillable
- T31.91Burns involving 90% or more of body surface with 10-19% third degree burnsBillable
- T31.92Burns involving 90% or more of body surface with 20-29% third degree burnsBillable
- T31.93Burns involving 90% or more of body surface with 30-39% third degree burnsBillable
- T31.94Burns involving 90% or more of body surface with 40-49% third degree burnsBillable
- T31.95Burns involving 90% or more of body surface with 50-59% third degree burnsBillable
- T31.96Burns involving 90% or more of body surface with 60-69% third degree burnsBillable
- T31.97Burns involving 90% or more of body surface with 70-79% third degree burnsBillable
- T31.98Burns involving 90% or more of body surface with 80-89% third degree burnsBillable
- T31.99Burns involving 90% or more of body surface with 90% or more third degree burnsBillable