M87.072 ICD-10-CM Code: Idiopathic aseptic necrosis of left ankle
M87.072 maps to CMS-HCC V28 92. A source-labeled RAF reference is available. Documentation must support MEAT. 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 osteopathies (M86-M90)
M87.072
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceIdiopathic aseptic necrosis of left ankle
Death of bone tissue in the left ankle without infection, occurring without a known cause.
Buddy Insight
Idiopathic aseptic necrosis of the left ankle indicates bone death without infection in the left ankle joint structures, occurring without identifiable cause.
CMS-HCC V28
MappedHCC 92
Code-level coefficient reference
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
ACA/HHS
MappedHCC 055
Code-level coefficient reference
ESRD/PACE
MappedHCC 39
Code-level coefficient reference
RXHCC
MappedHCC 80
Code-level coefficient reference
Code Book Path
Inclusion Terms
Official- Idiopathic aseptic necrosis of metatarsus, tarsus, and phalanges of toes
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for M87.072 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for M87.072 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for M87.072 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for M87.072 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for M87.072 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for M87.072 in this effective period.
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 M87.072 an HCC code?
Yes. M87.072 (Idiopathic aseptic necrosis of left ankle) 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: M87.072 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
- M87.072
- Description
- Idiopathic aseptic necrosis of left ankle
- 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 M87.072 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →
MEAT Criteria for M87.072
For M87.072 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 M87.072 during that encounter, not just copy-forwarded from a problem list.
Coder workflow notes
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What This Code Means
M87.072 is the ICD-10-CM diagnosis code for idiopathic aseptic necrosis of left ankle. Death of bone tissue in the left ankle without infection, occurring without a known cause. M87.072 sits in the ICD-10-CM chapter for diseases of the musculoskeletal system and connective tissue (m00-m99), within the section covering other osteopathies (m86-m90).
Under the CMS-HCC V28 risk adjustment model, M87.072 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. No V24 mapping is shown for M87.072; use the applicable model and payment year when reviewing the V28 mapping. 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. 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.
Verify left-sided involvement is clearly documented in the clinical notes. Because M87.072 maps to an HCC category, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) before the diagnosis is used for risk adjustment. 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 M87.072 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify left-sided involvement is clearly documented in the clinical notes
- •Consider imaging findings (MRI or CT) that confirm avascular necrosis of the ankle
Clinical Significance
Idiopathic aseptic necrosis of the left ankle indicates bone death without infection in the left ankle joint structures, occurring without identifiable cause. This condition poses significant threat to ankle function and mobility, requiring specialized management to preserve joint integrity and prevent progression to ankle collapse or arthritis.
Documentation Requirements
- ✓Documentation of aseptic necrosis affecting left ankle
- ✓Evidence of idiopathic etiology (unknown cause)
- ✓Imaging confirmation of ankle bone necrosis without infection
- ✓Assessment of ankle joint stability and function
- ✓Exclusion of known causes of osteonecrosis
- ✓Documentation ruling out infectious ankle conditions
- ✓Treatment approach for joint preservation
- ✓Functional impact assessment on ambulation