T32.41
BillableCorrosions involving 40-49% of body surface with 10-19% third degree corrosion
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is T32.41 an HCC code?
Yes. T32.41 maps to Severe Skin Burn or Condition under the CMS-HCC V28 risk adjustment model (and Severe Skin Burn or Condition under V24).
HCC Category Mapping
RAF weights shown are the community, non-dual, aged base weights from the CMS risk adjustment model file. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.
MEAT Criteria for T32.41
For T32.41 to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically — it has to be re-documented and supported each calendar year.
- MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
- EEvaluate: test results, medication response, or physical findings reviewed by the provider
- AAssess: explicit mention in the assessment or plan with acknowledgment of status
- TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis
Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed T32.41 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
T32.41 is the ICD-10-CM diagnosis code for corrosions involving 40-49% of body surface with 10-19% third degree corrosion. Chemical burn affecting 40-49% of the body surface, with the most severe burns (third degree) covering 10-19% of the affected area. T32.41 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).
Under the CMS-HCC V28 risk adjustment model, T32.41 maps to Severe Skin Burn or Condition (HCC 385) with a community, non-dual, aged base RAF weight of 0.350. Under the older V24 model, T32.41 mapped to the same category but with a base RAF weight of 0.517 — V28 recalibrated weights across the entire model. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.
Always document both the total body surface area percentage and the percentage of third-degree corrosion separately. Because T32.41 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for T32.41 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Always document both the total body surface area percentage and the percentage of third-degree corrosion separately
- •Corrosion codes require documentation of the causative agent (acid, alkali, etc.) in addition to the extent codes
Clinical Significance
Corrosions involving 40-49% of body surface area with 10-19% third-degree involvement represent life-threatening major chemical burn injury with high mortality and morbidity risk. This level of chemical exposure requires immediate admission to a specialized chemical burn center with capability for complex decontamination, systemic toxicity management, and intensive care to address both local tissue damage and potential organ system toxicity.
Documentation Requirements
- ✓Documentation of 40-49% total body surface area chemical involvement
- ✓Clear documentation that 10-19% of affected area has third-degree corrosion
- ✓Identification of the specific chemical agent and exposure circumstances
- ✓Comprehensive emergency decontamination procedure documentation
- ✓Assessment of chemical burn progression and systemic absorption
- ✓Evidence of chemical burn center admission and specialized protocols
- ✓Documentation of toxicology consultation and systemic monitoring
- ✓Surgical evaluation for debridement and reconstruction planning