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T32.81

Billable

Corrosions involving 80-89% 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 T32.81 an HCC code?

Yes. T32.81 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

V28HCC 385 — Severe Skin Burn or Condition
0.350
V24HCC 162 — Severe Skin Burn or Condition
0.517
ESRDHCC 162 — Severe Skin Burn or Condition
0.000

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 T32.81

For T32.81 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 T32.81 during that encounter — not just copy-forwarded from a problem list.

What This Code Means

T32.81 is the ICD-10-CM diagnosis code for corrosions involving 80-89% of body surface with 10-19% third degree corrosion. A severe chemical burn affecting 80-89% of the body surface, with the deepest burns (third degree) covering 10-19% of the affected area. This is a massive injury with significant deep tissue damage across most of the body. T32.81 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, T32.81 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, T32.81 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.

Document fluid resuscitation requirements and monitoring parameters as these extensive burns require aggressive management. Because T32.81 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 T32.81 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

  • •Document fluid resuscitation requirements and monitoring parameters as these extensive burns require aggressive management
  • •Cross-reference with inhalation injury codes if respiratory tract involvement is present

Clinical Significance

This represents massive chemical burns covering 80-89% of the body with moderate deep tissue damage (10-19% third-degree), indicating critical injury requiring immediate burn center care. These patients face extremely high mortality risk and require intensive medical management, extensive surgical intervention, and prolonged specialized care with significant potential for fatal complications.

Documentation Requirements

  • ✓Total body surface area (80-89%)
  • ✓Third-degree burn percentage (10-19%)
  • ✓Chemical agent identification
  • ✓Exposure circumstances and timeline
  • ✓Current treatment phase
  • ✓Anatomical distribution
  • ✓Associated systemic complications
  • ✓Surgical procedures and wound management

Commonly Confused Codes

T32.71 — Involves 70-79% total BSA instead of 80-89%T32.82 — Has 20-29% third-degree involvement instead of 10-19%T32.80 — Has 0-9% third-degree involvement instead of 10-19%T31.81 — Thermal burns rather than chemical corrosions

Code Hierarchy

└T32Corrosions classified according to extent of body surface involved└T32.8Corrosions involving 80-89% of body surface└T32.81Corrosions involving 80-89% of body surface with 10-19% third degree corrosion
└T32.81Corrosions involving 80-89% of body surface with 10-19% third degree corrosion

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