M87.344
BillableOther secondary osteonecrosis, right finger(s)
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is M87.344 an HCC code?
Yes. M87.344 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 M87.344
For M87.344 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 M87.344 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
M87.344 is the ICD-10-CM diagnosis code for other secondary osteonecrosis, right finger(s). Death of bone tissue in the right finger(s) caused by an underlying condition or injury, potentially affecting multiple fingers on the right hand. M87.344 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, M87.344 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, M87.344 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 when one or more right fingers are affected; document which specific fingers if possible for clinical clarity. Because M87.344 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 M87.344 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This code applies when one or more right fingers are affected; document which specific fingers if possible for clinical clarity
- •Verify the underlying cause of secondary osteonecrosis is documented and coded separately
Clinical Significance
This diagnosis represents secondary osteonecrosis of the right finger bones caused by underlying conditions such as corticosteroid therapy, radiation exposure, or systemic diseases. It requires ongoing monitoring for bone collapse and potential surgical intervention, while identifying and managing the causative factor.
Documentation Requirements
- ✓Documentation of osteonecrosis affecting right finger(s)
- ✓Identification of underlying cause (e.g., corticosteroid use, radiation, sickle cell disease)
- ✓Imaging findings confirming bone necrosis (MRI, X-ray, CT)
- ✓Clinical symptoms such as pain, stiffness, or functional impairment
- ✓Specific finger(s) affected if known
- ✓Duration and progression of condition
- ✓Treatment history and response
- ✓Functional impact on hand use