M87.041
BillableIdiopathic aseptic necrosis of right hand
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is M87.041 an HCC code?
Yes. M87.041 maps to Bone/Joint/Muscle Infections/Necrosis under the CMS-HCC V28 risk adjustment model (and Bone/Joint/Muscle Infections/Necrosis under V24).
HCC Category Mapping
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 M87.041
For M87.041 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 M87.041 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
M87.041 is the ICD-10-CM diagnosis code for idiopathic aseptic necrosis of right hand. Death of bone tissue in the right hand (excluding fingers) without infection, occurring without a known cause. M87.041 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, M87.041 maps to Bone/Joint/Muscle Infections/Necrosis (HCC 92) with a community, non-dual, aged base RAF weight of 0.209. Under the older V24 model, M87.041 mapped to the same category but with a base RAF weight of 0.482 — 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.
This code applies to the hand proper; use M87.044-M87.046 if fingers are specifically involved. Because M87.041 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 M87.041 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
Clinical Significance
Idiopathic aseptic necrosis of the right hand represents bone death in metacarpal bones without identifiable cause, potentially affecting grip strength and fine motor function. This condition can significantly impact hand function and may require surgical intervention including bone grafting or joint fusion to preserve hand mobility and strength.
Documentation Requirements
- ✓Documentation of aseptic necrosis specifically affecting right hand bones
- ✓Confirmation of idiopathic etiology with no underlying cause identified
- ✓Imaging evidence showing bone necrosis in right hand metacarpal structures
- ✓Clear laterality documentation specifying right hand involvement
- ✓Exclusion of infectious processes through clinical evaluation
- ✓Assessment of hand function, grip strength, and fine motor skills
- ✓Treatment plan including conservative management or surgical options
- ✓Documentation of pain and functional limitations in hand activities