M90.531

HCC Category Mapping

What This Code Means

Death of bone tissue in the right forearm caused by another disease or condition affecting the body.

Coding Tips

• •Forearm includes the radius and ulna bones; confirm the underlying etiology is documented
• •This is a secondary code - the primary diagnosis should be the disease causing the osteonecrosis

Clinical Significance

Secondary osteonecrosis of the right forearm represents bone death in the radius and/or ulna caused by underlying systemic disease, potentially affecting hand and wrist function. This condition requires management of both the primary disease and skeletal complications to prevent further deterioration.

Documentation Requirements

• ✓Underlying causative disease documented and coded first
• ✓Right forearm (radius/ulna) specifically identified as affected site
• ✓Clinical evidence of bone tissue death present
• ✓Imaging studies confirming forearm osteonecrosis
• ✓Assessment of right arm and hand function
• ✓Treatment plan for primary condition and bone complications
• ✓Documentation of any associated wrist or elbow involvement

Commonly Confused Codes