T32.86
BillableCorrosions involving 80-89% of body surface with 60-69% third degree corrosion
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is T32.86 an HCC code?
Yes. T32.86 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 T32.86
For T32.86 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 T32.86 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
T32.86 is the ICD-10-CM diagnosis code for corrosions involving 80-89% of body surface with 60-69% third degree corrosion. Severe chemical burn covering 80-89% of the body with the deepest burns affecting 60-69% of that area. This represents an extremely critical injury with high mortality risk. T32.86 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, T32.86 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, T32.86 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.
Verify documentation clearly distinguishes between corrosion (chemical) and thermal burns, as this affects code selection. Because T32.86 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 T32.86 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify documentation clearly distinguishes between corrosion (chemical) and thermal burns, as this affects code selection
- •Ensure the seventh character extension is included to indicate whether this is the initial encounter, subsequent visit, or sequela
Clinical Significance
This indicates extremely severe chemical burns affecting 80-89% of the body where the majority of affected area has full-thickness destruction (60-69% third-degree), representing near-fatal injury with exceptional mortality risk. These patients require immediate burn center intervention with aggressive surgical management and face critical prognosis with extensive tissue loss.
Documentation Requirements
- ✓Body surface area involvement (80-89%)
- ✓Third-degree burn extent (60-69%)
- ✓Specific chemical agent and exposure details
- ✓Timeline of injury and emergency care
- ✓Current treatment status and response
- ✓Anatomical distribution of burns
- ✓Associated complications and organ dysfunction
- ✓Extensive surgical interventions required