T32.33 maps to CMS-HCC V28 385. A source-labeled RAF reference is available. Confirm the documented diagnosis and applicable coding requirements. MEAT criteria · RAF Calculator · HCC Buddy coding tools

ICD-10-CM Code View

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Code lookupT32.33

Effective 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)

T32.33

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

Corrosions involving 30-39% of body surface with 30-39% third degree corrosion

Chemical burn affecting 30-39% of the body surface with extensive deep tissue damage (30-39% third degree burns).

Buddy Insight

Corrosions involving 30-39% of body surface area where all affected tissue (30-39%) is third-degree represents catastrophic chemical burn injury with extremely high mortality risk.

Overview Risk Models Code Book Documentation Audit Notes Edition comparison

CMS-HCC V28

Mapped

HCC 385

Severe Skin Burn or Condition

Coefficient HCC 385: 1.291 (Community Non-Dual Aged (CNA))

CMS-HCC V24

Historical

Not used for standard CY2026 Medicare Advantage payment. Select a historical period to review V24.

Not used for CY2026 payment

ACA/HHS

Mapped

HCC 218

HHS-HCC 218 adult, RAF varies...

Code-level coefficient reference

ESRD/PACE

Mapped

HCC 162

Severe Skin Burn or Condition

Code-level coefficient reference

RXHCC

N/A

—

Not risk-adjusted for this model/period.

Not mapped

Code Book Path

Official

T32Corrosions classified according to extent of body surface involved T32.3Corrosions involving 30-39% of body surface T32.33Corrosions involving 30-39% of body surface with 30-39% third degree corrosion

Inclusion Terms

Official

No inclusion terms are included in this display for T32.33. Check the code and parent instructions in the Code Book.

Excludes 2

Official

birth trauma (P10-P15)Inherited from S00-T88
obstetric trauma (O70-O71)Inherited from S00-T88

Related Codes

Official

T32.30Corrosions involving 30-39% of body surface with 0% to 9% third degree corrosion T32.31Corrosions involving 30-39% of body surface with 10-19% third degree corrosion T32.32Corrosions involving 30-39% of body surface with 20-29% third degree corrosion

Includes

Official

No Includes notes are included in this display for T32.33. Check the code and parent instructions in the Code Book.

Excludes 1

Official

No Excludes 1 notes are included in this display for T32.33. Check the code and parent instructions in the Code Book.

Code First

Official

No Code First sequencing instructions are included in this display for T32.33. Check the code and parent instructions in the Code Book.

Use Additional

Official

code to identify any retained foreign body, if applicable (Z18.-)Inherited from S00-T88

Code Also

Official

No Code Also instructions are included in this display for T32.33. Check the code and parent instructions in the Code Book.

Buddy Documentation Tip

HCC Buddy guidance

Documentation that 30-39% of total body surface area has chemical corrosion

Clear documentation that all affected areas (30-39%) are third-degree

Identification of the causative chemical agent and exposure details

Comprehensive emergency decontamination and neutralization documentation

MEAT Support

HCC Buddy guidance

Documentation that 30-39% of total body surface area has chemical corrosion

Clear documentation that all affected areas (30-39%) are third-degree

Identification of the causative chemical agent and exposure details

Comprehensive emergency decontamination and neutralization documentation

Audit Caution

HCC Buddy guidance

Not recognizing that both percentages must be equal (30-39%) for this code

Failing to distinguish chemical corrosions from thermal burn mechanisms

Inadequate assessment of complete tissue destruction across all affected areas

Not documenting the extraordinary care requirements for such severe chemical injuries

Common Mistakes

HCC Buddy guidance

T31.33 — Thermal burns 30-39% TBSA with 30-39% third degree (thermal, not chemical)

T32.32 — Corrosions 30-39% TBSA with 20-29% third degree (not all third-degree)

T32.44 — Corrosions 40-49% TBSA with 40-49% third degree (larger area)

T32.22 — Corrosions 20-29% TBSA with 20-29% third degree (smaller area)

Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →

Is T32.33 an HCC code?

Yes. T32.33 (Corrosions involving 30-39% of body surface with 30-39% third degree corrosion) maps to HCC 385, Severe Skin Burn or Condition under the CMS-HCC V28 risk adjustment model, with a source-labeled community non-dual aged reference coefficient of 1.291. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes. It is billable for payment year 2026.

Coder answer: T32.33 is billable and maps to V28 HCC 385, Severe Skin Burn or Condition. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.

Code: T32.33
Description: Corrosions involving 30-39% of body surface with 30-39% third degree corrosion
HCC (V28): HCC 385 — Severe Skin Burn or Condition
RAF reference coefficient: 1.291
Billable: Yes
Payment year: 2026

HCC Category Mapping

V28HCC 385, Severe Skin Burn or Condition

1.291

ESRDHCC 162, Severe Skin Burn or Condition

Not separately weighted

These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. Weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.

Work T32.33 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT review for T32.33

For T32.33, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule.

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

Coder workflow notes

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What This Code Means

T32.33 is the ICD-10-CM diagnosis code for corrosions involving 30-39% of body surface with 30-39% third degree corrosion. Chemical burn affecting 30-39% of the body surface with extensive deep tissue damage (30-39% third degree burns). T32.33 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, T32.33 maps to Severe Skin Burn or Condition (HCC 385) with a source-labeled community, non-dual, aged reference coefficient of 1.291. For CY2026 non-PACE Medicare Advantage, CMS uses 100% of the 2024 CMS-HCC model (V28). PACE uses a separate model blend. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes.

This represents a life-threatening injury with high mortality risk requiring immediate resuscitation. For T32.33, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule. 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, source-labeled coefficient references, and MEAT documentation criteria for T32.33 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•This represents a life-threatening injury with high mortality risk requiring immediate resuscitation
•Ensure comprehensive documentation of all body systems affected and all interventions performed

Clinical Significance

Corrosions involving 30-39% of body surface area where all affected tissue (30-39%) is third-degree represents catastrophic chemical burn injury with extremely high mortality risk. This pattern indicates aggressive chemical action causing complete tissue destruction across the entire affected area, requiring immediate life-sustaining interventions, specialized chemical burn protocols, and comprehensive management of systemic toxicity.

Documentation Requirements

✓Documentation that 30-39% of total body surface area has chemical corrosion
✓Clear documentation that all affected areas (30-39%) are third-degree
✓Identification of the causative chemical agent and exposure details
✓Comprehensive emergency decontamination and neutralization documentation
✓Assessment confirming complete tissue destruction through all layers
✓Evidence of immediate chemical burn center admission
✓Documentation of systemic toxicity assessment and antidotal therapy
✓Surgical planning for extensive reconstruction and life-saving procedures

Commonly Confused Codes

•T31.33: Thermal burns 30-39% TBSA with 30-39% third degree (thermal, not chemical)
•T32.32: Corrosions 30-39% TBSA with 20-29% third degree (not all third-degree)
•T32.44: Corrosions 40-49% TBSA with 40-49% third degree (larger area)
•T32.22: Corrosions 20-29% TBSA with 20-29% third degree (smaller area)
•T32.31: Corrosions 30-39% TBSA with 10-19% third degree (much less third-degree)