M87.142
BillableOsteonecrosis due to drugs, left hand
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is M87.142 an HCC code?
Yes. M87.142 maps to Bone/Joint/Muscle Infections/Necrosis under the V24 model but is not retained in V28.
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 M87.142
For M87.142 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 M87.142 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
M87.142 is the ICD-10-CM diagnosis code for osteonecrosis due to drugs, left hand. Death of bone tissue in the left hand caused by medication side effects, leading to bone deterioration and potential loss of function. M87.142 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 older CMS-HCC V24 model, M87.142 maps to Bone/Joint/Muscle Infections/Necrosis (HCC 39) with a community, non-dual, aged base RAF weight of 0.482. 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.
Verify the specific medication causing the osteonecrosis and document it in the medical record for accurate coding. Because M87.142 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 M87.142 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify the specific medication causing the osteonecrosis and document it in the medical record for accurate coding
- •Ensure laterality is clearly documented as 'left hand' to distinguish from right hand or unspecified codes
Clinical Significance
Drug-induced osteonecrosis of the left hand indicates medication-related bone death affecting multiple hand structures, with particular consideration for dominant hand impact on functional capacity. This condition requires specialized hand surgery consultation and comprehensive rehabilitation planning for optimal functional outcomes.
Documentation Requirements
- ✓Explicit documentation of left hand osteonecrosis involvement
- ✓Causative drug identification with dosage and duration when available
- ✓Imaging studies demonstrating extent of hand bone necrosis
- ✓Functional assessment including grip strength, pinch, and dexterity
- ✓Assessment of hand dominance and impact on daily activities
- ✓Drug exposure timeline and relationship to symptom development
- ✓Comprehensive treatment plan including surgical and non-surgical options
- ✓Provider documentation establishing drug-induced etiology
Commonly Confused Codes
- •M87.141 — Right hand osteonecrosis, opposite laterality
- •M87.138 — Left carpus osteonecrosis limited to wrist bones
- •M87.143 — Unspecified hand when left side is documented
- •M87.145 — Left finger osteonecrosis more specific than hand involvement
- •M87.242 — Post-traumatic left hand requires injury history