T32.53 ICD-10-CM Code: Corrosions involving 50-59% of body surface with 30-39% third degree corrosion
T32.53 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 · free HCC coding tools
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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)
T32.53
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceCorrosions involving 50-59% of body surface with 30-39% third degree corrosion
Chemical burn affecting 50-59% of the body surface, with the most severe burns (third degree) covering 30-39% of the affected area.
Buddy Insight
This represents severe chemical burns affecting over half the body surface with extensive third-degree injury, indicating critical patient status requiring intensive care and complex wound management.
CMS-HCC V28
MappedHCC 385
Coefficient HCC 385: 1.291 (Community Non-Dual Aged (CNA))
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
ACA/HHS
MappedHCC 218
Code-level coefficient reference
ESRD/PACE
MappedHCC 162
Code-level coefficient reference
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialNo inclusion terms are included in this display for T32.53. 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
Includes
OfficialNo Includes notes are included in this display for T32.53. Check the code and parent instructions in the Code Book.
Excludes 1
OfficialNo Excludes 1 notes are included in this display for T32.53. Check the code and parent instructions in the Code Book.
Code First
OfficialNo Code First sequencing instructions are included in this display for T32.53. 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
OfficialNo Code Also instructions are included in this display for T32.53. Check the code and parent instructions in the Code Book.
Buddy Documentation Tip
MEAT Support
Audit Caution
Common Mistakes
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 T32.53 an HCC code?
Yes. T32.53 (Corrosions involving 50-59% 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: T32.53 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
- T32.53
- Description
- Corrosions involving 50-59% 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
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 T32.53 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →
MEAT review for T32.53
For T32.53, 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
T32.53 is the ICD-10-CM diagnosis code for corrosions involving 50-59% of body surface with 30-39% third degree corrosion. Chemical burn affecting 50-59% of the body surface, with the most severe burns (third degree) covering 30-39% of the affected area. T32.53 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, T32.53 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 severe corrosion injury with significant full-thickness tissue damage requiring long-term specialized care. For T32.53, 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 T32.53 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This represents a severe corrosion injury with significant full-thickness tissue damage requiring long-term specialized care
- •Document the need for skin grafting, reconstructive surgery, and rehabilitation planning
Clinical Significance
This represents severe chemical burns affecting over half the body surface with extensive third-degree injury, indicating critical patient status requiring intensive care and complex wound management. Such extensive corrosive injuries carry high mortality risk and require comprehensive multidisciplinary treatment approaches including fluid resuscitation, infection prevention, and potential skin grafting.
Documentation Requirements
- ✓Percentage of total body surface area affected (50-59%)
- ✓Percentage of third-degree burns (30-39%)
- ✓Type of corrosive agent involved
- ✓Mechanism and circumstances of injury
- ✓Clinical assessment of burn depth and severity
- ✓Treatment provided including debridement, grafting, or wound care
- ✓Complications such as infection, contractures, or organ dysfunction
- ✓Functional impact and rehabilitation needs
Commonly Confused Codes
- •T32.52: Burns (thermal) involving 50-59% with 20-29% third degree
- •T32.54: Same body surface area but higher percentage of third degree burns (40-49%)
- •T24.xxx: Localized corrosion of specific body regions rather than total body surface
- •T31.53: Thermal burns with same percentages but different etiology
- •T32.43: Lower total body surface involvement (40-49%) with same third degree percentage