T31.40 ICD-10-CM Code: Burns involving 40-49% of body surface with 0% to 9% third degree burns
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FY 2026 Apr update / Injury, poisoning and certain other consequences of external causes (S00-T88) / Burns and corrosions of multiple and unspecified body regions (T30-T32)
T31.40
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceBurns involving 40-49% of body surface with 0% to 9% third degree burns
Critical burns covering 40-49% of the body surface with minimal deep tissue damage (0-9% third degree burns). This is a life-threatening injury requiring immediate intensive care and burn center treatment.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
MappedHCC 219
Varies by metal level
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
Official- Burns involving 40-49% of body surface NOS
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for T31.40 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for T31.40 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for T31.40 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for T31.40 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for T31.40 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for T31.40 in this effective period.
Buddy Documentation Tip
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
Is T31.40 an HCC code?
No. T31.40 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
- Code
- T31.40
- Description
- Burns involving 40-49% of body surface with 0% to 9% third degree burns
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF
- —
- Billable
- Yes
- Payment year
- 2026
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
T31.40 is the ICD-10-CM diagnosis code for burns involving 40-49% of body surface with 0% to 9% third degree burns. Critical burns covering 40-49% of the body surface with minimal deep tissue damage (0-9% third degree burns). This is a life-threatening injury requiring immediate intensive care and burn center treatment. T31.40 sits in the ICD-10-CM chapter for injury, poisoning and certain other consequences of external causes (s00-t88), within the section covering burns and corrosions of multiple and unspecified body regions (t30-t32).
T31.40 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
Burns in the 40-49% range are considered critical and require documentation of burn center admission.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for T31.40 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Burns in the 40-49% range are considered critical and require documentation of burn center admission
- •Ensure both percentages are clearly documented to distinguish this from other burn severity levels