M87.163 ICD-10-CM Code: Osteonecrosis due to drugs, unspecified tibia

Code

M87.163

Description

Osteonecrosis due to drugs, unspecified tibia

HCC (V28)

No CMS-HCC V28 mapping

RAF reference coefficient

—

Billable

Yes

Payment year

2026

HCC Category Mapping

These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. Weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.

Work M87.163 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT review for M87.163

What This Code Means

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for M87.163 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

• •Use this code only when laterality cannot be determined from the medical record
• •Query the provider if imaging or clinical documentation suggests a specific side to improve coding specificity

Clinical Significance

Drug-induced osteonecrosis of unspecified tibia indicates medication-related bone death when laterality cannot be determined from available documentation. This condition represents significant functional impairment potential and requires comprehensive orthopedic management despite the laterality limitation.

Documentation Requirements

• ✓Documentation confirming tibial involvement in osteonecrosis
• ✓Specific causative medication or drug class identification
• ✓Imaging evidence demonstrating tibial osteonecrosis
• ✓Assessment of weight-bearing function and mobility impact
• ✓Explanation for inability to determine affected leg
• ✓Drug exposure history with temporal relationship to symptoms
• ✓Treatment approach addressing functional preservation
• ✓Provider confirmation of drug-induced etiology

Commonly Confused Codes

• •M87.161/M87.162: Use specific laterality when right/left is documented
• •M87.166: Unspecified fibula affects different lower leg bone
• •M87.263: Post-traumatic unspecified tibia requires injury history
• •M87.063: Idiopathic tibia osteonecrosis lacks drug causation
• •S82.2: Unspecified tibia fracture is acute trauma, not chronic necrosis

Child Codes