M90.50

HCC Category Mapping

What This Code Means

Death of bone tissue (osteonecrosis) caused by another disease, affecting an unspecified body location.

Coding Tips

• •This code requires documentation of the underlying disease causing the osteonecrosis; code that condition separately
• •Query provider for specific anatomical site if not documented, as more specific M90.5 codes exist

Clinical Significance

Secondary osteonecrosis represents bone death caused by underlying disease processes, requiring identification and treatment of both the bone necrosis and causative condition. This diagnosis indicates serious skeletal complications with significant impact on morbidity and healthcare resource utilization.

Documentation Requirements

• ✓Primary disease causing osteonecrosis clearly documented
• ✓Clinical evidence of bone tissue death or necrosis
• ✓Imaging studies confirming osteonecrosis
• ✓Code first the underlying disease process
• ✓Functional assessment of affected area
• ✓Treatment plan addressing both primary disease and bone necrosis
• ✓Staging or severity of osteonecrosis if applicable

Commonly Confused Codes