M87.337
BillableOther secondary osteonecrosis of right carpus
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is M87.337 an HCC code?
Yes. M87.337 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 M87.337
For M87.337 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 M87.337 during that encounter — not just copy-forwarded from a problem list.
What This Code Means
M87.337 is the ICD-10-CM diagnosis code for other secondary osteonecrosis of right carpus. Death of bone tissue in the right wrist bones (carpus) caused by an underlying condition or injury, leading to bone deterioration. M87.337 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, M87.337 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, M87.337 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.
The carpus includes multiple small wrist bones; this code applies when the specific bone cannot be identified. Because M87.337 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 M87.337 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •The carpus includes multiple small wrist bones; this code applies when the specific bone cannot be identified
- •Verify documentation specifies right side to ensure accurate code selection
Clinical Significance
Secondary osteonecrosis of the right carpus indicates bone death in the wrist bones from identifiable non-traumatic causes. This condition significantly affects wrist mechanics and hand function, often requiring specialized surgical intervention to preserve joint mobility and prevent collapse.
Documentation Requirements
- ✓Documentation of underlying secondary cause of osteonecrosis
- ✓Imaging confirmation of osteonecrosis in right carpal bones
- ✓Clinical examination showing right wrist dysfunction
- ✓History of risk factors such as medications or systemic disease
- ✓Exclusion of traumatic and idiopathic etiologies
- ✓Documentation of pain, stiffness, or grip weakness
- ✓Provider statement on secondary nature of condition
- ✓Evidence of compromised bone blood supply in carpus