What is ICD-10 code T32.71?

T32.71 is the ICD-10-CM diagnosis code for Corrosions involving 70-79% of body surface with 10-19% third degree corrosion. It belongs to the ICD-10-CM chapter for injury, poisoning and certain other consequences of external causes (s00-t88). T32.71 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. T32.71 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Yes. T32.71 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. T32.71 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

What is the V28 vs V24 difference for T32.71?

CMS phased in the V28 risk adjustment model over payment years 2024 (33%), 2025 (67%), and 2026 (100%), replacing V24. V28 consolidates HCC categories, removes some lower-acuity conditions, and recalibrates RAF weights across the entire model. For T32.71, V28 maps to Severe Skin Burn or Condition at RAF 0.350 while V24 mapped to Severe Skin Burn or Condition at RAF 0.517. Both models can still appear in legacy data and in payer-specific lookback periods.

What should coders know when reporting T32.71?

Document the source and type of chemical agent involved for complete clinical documentation Include the seventh character extension to properly classify the episode of care Because T32.71 maps to a payment HCC, the documentation must also satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's risk adjustment score.

T32.71 ICD-10 Code: Corrosions involving 70-79%

ICD-10-CM Code View

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Code lookupT32.71Effective periodFY2026 Apr Update (Apr 1-Sep 30)

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)

T32.71

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Corrosions involving 70-79% of body surface with 10-19% third degree corrosion

Chemical burn affecting 70-79% of the body surface with 10-19% deep tissue damage (third degree corrosion). This is a critical chemical injury with extensive body surface involvement and moderate full-thickness burns.

Buddy Insight

CMS-HCC V28

Mapped

HCC 385

Severe Skin Burn or Condition

RAF 0.350

CMS-HCC V24

Mapped

HCC 162

Severe Skin Burn or Condition

RAF 0.517

ACA/HHS

Not risk-adjusted for this model/period.

RAF 0

ESRD/PACE

Mapped

HCC 162

Severe Skin Burn or Condition

RAF 0.0

RXHCC

Not risk-adjusted for this model/period.

RAF 0

Code Trumping

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Code Book Path

Official

T32Corrosions classified according to extent of body surface involved

T32.7Corrosions involving 70-79% of body surface

T32.71Corrosions involving 70-79% of body surface with 10-19% third degree corrosion

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for T32.71 in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for T32.71 in this effective period.

Related Child Codes

Official

T32.70Corrosions involving 70-79% of body surface with 0% to 9% third degree corrosion

T32.72Corrosions involving 70-79% of body surface with 20-29% third degree corrosion

T32.73Corrosions involving 70-79% of body surface with 30-39% third degree corrosion

T32.74Corrosions involving 70-79% of body surface with 40-49% third degree corrosion

T32.75Corrosions involving 70-79% of body surface with 50-59% third degree corrosion

Includes

Official

ICD-10-CM does not list Includes notes for T32.71 in this effective period.

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for T32.71 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for T32.71 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for T32.71 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for T32.71 in this effective period.

Buddy Documentation Tip

HCC Buddy guidance

Total body surface area (70-79%)

Third-degree burn extent (10-19%)

Chemical agent identification

Exposure circumstances and timeline

MEAT Support

HCC Buddy guidance

Total body surface area (70-79%)

Third-degree burn extent (10-19%)

Chemical agent identification

Exposure circumstances and timeline

Audit Caution

HCC Buddy guidance

Misreading the dual percentage requirements

Coding thermal burns when chemical injury documented

Omitting external cause codes for chemical agent

Inaccurate body surface area calculations

Common Mistakes

HCC Buddy guidance

T32.61 — Involves 60-69% total BSA instead of 70-79%

T32.72 — Has 20-29% third-degree involvement instead of 10-19%

T32.70 — Has 0-9% third-degree involvement instead of 10-19%

T31.71 — Thermal burns rather than chemical corrosions

Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.

Is T32.71 an HCC code?

Yes. T32.71 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 T32.71

For T32.71to 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 T32.71 during that encounter, not just copy-forwarded from a problem list.

What This Code Means

T32.71 is the ICD-10-CM diagnosis code for corrosions involving 70-79% of body surface with 10-19% third degree corrosion. Chemical burn affecting 70-79% of the body surface with 10-19% deep tissue damage (third degree corrosion). This is a critical chemical injury with extensive body surface involvement and moderate full-thickness burns. T32.71 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, T32.71 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, T32.71 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 the source and type of chemical agent involved for complete clinical documentation. Because T32.71 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 T32.71 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Document the source and type of chemical agent involved for complete clinical documentation
•Include the seventh character extension to properly classify the episode of care

Clinical Significance

This represents extensive chemical burns affecting 70-79% of the body with moderate full-thickness involvement (10-19% third-degree), indicating critical injury requiring immediate burn center management. These patients face significant mortality risk and require intensive medical care, surgical intervention, and prolonged rehabilitation with high potential for complications.