M90.542

HCC Category Mapping

What This Code Means

Death of bone tissue in the left hand caused by another disease or condition affecting the body.

Coding Tips

• •If multiple hand bones are affected, document the extent and location for clinical documentation
• •This code indicates the osteonecrosis is secondary to another systemic disease

Clinical Significance

Secondary osteonecrosis of the left hand represents bone tissue death resulting from an underlying systemic disease, requiring specialized medical management. This diagnosis carries significant risk adjustment implications due to associated functional impairment and complex care coordination needs.

Documentation Requirements

• ✓Documentation of the underlying classified disease causing osteonecrosis
• ✓Specific identification of left hand as the affected anatomical location
• ✓Imaging studies confirming bone necrosis (MRI, bone scan, or CT)
• ✓Provider documentation establishing causal relationship to primary disease
• ✓Current treatment plan addressing both primary condition and osteonecrosis
• ✓Assessment of hand function and impact on patient activities
• ✓Clinical notes excluding primary or traumatic causes of bone death
• ✓Monitoring documentation for disease progression or treatment response

Commonly Confused Codes