Major osseous defect, unspecified hand

This code signifies a significant loss of bone tissue in an unspecified part of the hand. This defect can result from trauma, infection, tumor resection, or congenital anomalies, leading to structural instability or functional impairment.

Apply this code when documentation clearly indicates a major osseous defect of the hand, but the specific bone (e.g., carpal, metacarpal, phalanx) or laterality (left/right) is not specified. This is appropriate for initial assessments or when detailed imaging results are pending.

• Avoid using this code if the specific hand bone or laterality is documented; instead, use a more precise code from the M89.74- subcategory.
• Ensure the documentation explicitly states "major osseous defect" or describes a significant bone loss rather than a minor fracture or cortical irregularity.
• Consider sequencing this code with an external cause code (e.g., V00-Y99) if the defect is due to trauma.