M87.832
BillableOther osteonecrosis of left radius
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is M87.832 an HCC code?
Yes. M87.832 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 M87.832
For M87.832 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 M87.832 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
M87.832 is the ICD-10-CM diagnosis code for other osteonecrosis of left radius. Death of bone tissue in the left radius (larger forearm bone) due to causes other than trauma or infection, leading to bone deterioration and potential collapse. M87.832 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, M87.832 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, M87.832 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.
Confirm left side is clearly documented in the medical record to avoid coding errors. Because M87.832 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 M87.832 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Confirm left side is clearly documented in the medical record to avoid coding errors
- •Document any associated conditions or risk factors that may have contributed to the osteonecrosis
Clinical Significance
Osteonecrosis of the left radius is a chronic bone condition that can significantly impact wrist and hand function, leading to disability and reduced quality of life. This diagnosis carries important risk adjustment implications as it indicates a complex orthopedic condition requiring ongoing specialist care and potential surgical intervention.
Documentation Requirements
- ✓Clear specification of the left radius as the affected bone
- ✓Documentation that osteonecrosis is from causes other than idiopathic or drug-induced
- ✓Radiological evidence (MRI, CT, X-ray) confirming bone necrosis
- ✓Clinical presentation including pain, functional limitation, or joint stiffness
- ✓Exclusion of infectious causes or trauma as primary etiology
- ✓Assessment of impact on activities of daily living and work function
- ✓Documentation of any predisposing factors or underlying conditions
- ✓Provider evaluation of treatment needs and prognosis