M72.6 ICD-10-CM Code: Necrotizing fasciitis
M72.6 maps to CMS-HCC V28 92. A source-labeled RAF reference is available. Confirm the documented diagnosis and applicable coding requirements. MEAT criteria · RAF Calculator · HCC Buddy coding tools
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FY 2026 Apr update / Diseases of the musculoskeletal system and connective tissue (M00-M99) / Other soft tissue disorders (M70-M79)
M72.6
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceNecrotizing fasciitis
A serious, rapidly spreading bacterial infection of the tissue layers beneath the skin that can cause severe tissue death and requires urgent medical treatment.
Buddy Insight
Necrotizing fasciitis is a life-threatening soft tissue infection requiring immediate aggressive treatment including surgical debridement and intensive antimicrobial therapy.
CMS-HCC V28
MappedHCC 92
Coefficient HCC 92: 0.479 (Community Non-Dual Aged (CNA))
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
ACA/HHS
MappedHCC 054
Code-level coefficient reference
ESRD/PACE
MappedHCC 39
Code-level coefficient reference
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialNo inclusion terms are included in this display for M72.6. Check the code and parent instructions in the Code Book.
Excludes 2
Official- arthropathic psoriasis (L40.5-)Inherited from M00-M99, M72
- certain conditions originating in the perinatal period (P04-P96)Inherited from M00-M99, M72
- certain infectious and parasitic diseases (A00-B99)Inherited from M00-M99, M72
- compartment syndrome (traumatic) (T79.A-)Inherited from M00-M99, M72
- complications of pregnancy, childbirth and the puerperium (O00-O9A)Inherited from M00-M99, M72
- congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)Inherited from M00-M99, M72
- endocrine, nutritional and metabolic diseases (E00-E88)Inherited from M00-M99, M72
- injury, poisoning and certain other consequences of external causes (S00-T88)Inherited from M00-M99, M72
- neoplasms (C00-D49)Inherited from M00-M99, M72
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)Inherited from M00-M99, M72
- retroperitoneal fibromatosis (D48.3)Inherited from M00-M99, M72
Related Codes
Includes
OfficialNo Includes notes are included in this display for M72.6. Check the code and parent instructions in the Code Book.
Excludes 1
OfficialNo Excludes 1 notes are included in this display for M72.6. Check the code and parent instructions in the Code Book.
Code First
OfficialNo Code First sequencing instructions are included in this display for M72.6. Check the code and parent instructions in the Code Book.
Use Additional
Official- code (B95.-, B96.-) to identify causative organism
Code Also
OfficialNo Code Also instructions are included in this display for M72.6. 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 M72.6 an HCC code?
Yes. M72.6 (Necrotizing fasciitis) maps to HCC 92, Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis under the CMS-HCC V28 risk adjustment model, with a source-labeled community non-dual aged reference coefficient of 0.479. 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: M72.6 is billable and maps to V28 HCC 92, Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.
- Code
- M72.6
- Description
- Necrotizing fasciitis
- HCC (V28)
- HCC 92 — Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis
- RAF reference coefficient
- 0.479
- 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 M72.6 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →
MEAT review for M72.6
For M72.6, 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
M72.6 is the ICD-10-CM diagnosis code for necrotizing fasciitis. A serious, rapidly spreading bacterial infection of the tissue layers beneath the skin that can cause severe tissue death and requires urgent medical treatment. M72.6 sits in the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99), within the section covering other soft tissue disorders (m70-m79).
Under the CMS-HCC V28 risk adjustment model, M72.6 maps to Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis (HCC 92) with a source-labeled community, non-dual, aged reference coefficient of 0.479. 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 is a medical emergency; coordinate coding with sepsis codes if present (R65.2x). For M72.6, 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 M72.6 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This is a medical emergency; coordinate coding with sepsis codes if present (R65.2x)
- •Specify anatomical site and laterality; document causative organism when identified for complete coding
Clinical Significance
Necrotizing fasciitis is a life-threatening soft tissue infection requiring immediate aggressive treatment including surgical debridement and intensive antimicrobial therapy. This diagnosis represents a medical emergency with high mortality risk and significant long-term morbidity potential, requiring intensive monitoring and multidisciplinary care.
Documentation Requirements
- ✓Clinical diagnosis of necrotizing fasciitis with tissue necrosis
- ✓Surgical findings or pathological confirmation of fascial involvement
- ✓Documentation of rapid progression and systemic toxicity
- ✓Microbiological studies and culture results when available
- ✓Evidence of tissue destruction and necrosis
- ✓Treatment with surgical debridement and antibiotics
- ✓Assessment of extent and depth of infection
Commonly Confused Codes
- •L03.90: Cellulitis, unspecified (superficial infection without necrosis)
- •T79.3: Post-traumatic wound infection (infection without tissue death)
- •L08.9: Local infection of skin and subcutaneous tissue, unspecified
- •A49.9: Bacterial infection, unspecified (systemic without tissue necrosis)
- •L97.909: Non-pressure chronic ulcer (chronic wound without acute infection)