M87.021 Idiopathic aseptic necrosis of right humerus

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applies from M87 Osteonecrosis

Includes

• avascular necrosis of bone

Excludes1 (never code together)

• juvenile osteonecrosis (M91-M92)
• osteochondropathies (M90-M93)

Use additional code

• code to identify major osseous defect, if applicable (M89.7-)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 92 — Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis
• CMS-HCC V22: HCC 39 — Bone/Joint/Muscle Infections/Necrosis
• RxHCC V08: HCC 80 — Aseptic Necrosis of Bone
• ESRD V24: HCC 39

MS-DRG index

Defines the logic of DRG(s) 553-554 in MDC 08.

Approximate ICD-9-CM (GEMs)

• 733.41 Aseptic necrosis of head of humerus (approximate)

Code annotations containing back-references to M87.021

Back-references to M87

• Code First: M89.7 Major osseous defect ("aseptic necrosis of bone (M87.-)")
• Code First: M89.7 Major osseous defect ("osteonecrosis (M87.-)")

Nearby codes

• M87.01 Idiopathic aseptic necrosis of shoulder
• M87.011 Idiopathic aseptic necrosis of right shoulder
• M87.012 Idiopathic aseptic necrosis of left shoulder
• M87.019 Idiopathic aseptic necrosis of unspecified shoulder
• M87.02 Idiopathic aseptic necrosis of humerus
• M87.021 Idiopathic aseptic necrosis of right humerus (this code)
• M87.022 Idiopathic aseptic necrosis of left humerus
• M87.029 Idiopathic aseptic necrosis of unspecified humerus
• M87.03 Idiopathic aseptic necrosis of radius, ulna and carpus
• M87.031 Idiopathic aseptic necrosis of right radius
• M87.032 Idiopathic aseptic necrosis of left radius