T31.90
BillableBurns involving 90% or more of body surface with 0% to 9% third degree burns
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is T31.90 an HCC code?
No. T31.90 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
T31.90 is the ICD-10-CM diagnosis code for burns involving 90% or more of body surface with 0% to 9% third degree burns. Catastrophic burns covering 90% or more of the body with minimal deep tissue damage (0-9% third degree burns). This represents the most extensive burn injury possible with predominantly superficial to mid-depth burns. T31.90 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).
T31.90 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.
This code is used when total body surface area involvement is 90% or greater, regardless of specific percentage above 90%.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for T31.90 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This code is used when total body surface area involvement is 90% or greater, regardless of specific percentage above 90%.
- •Document the percentage of third degree burns (0-9%) separately from the total body surface area to ensure complete coding accuracy.