Major osseous defect, unspecified pelvic region and thigh

This code signifies a significant loss or absence of bone tissue within the pelvic region or thigh, without further specification of the exact location or underlying cause. It indicates a substantial structural abnormality of the bone.

Use this code when documentation clearly states a "major osseous defect" in the pelvis or thigh, and no further anatomical specificity (e.g., ilium, ischium, femur) is provided. This code is appropriate when the physician's notes describe a large bone void or deficiency in these general areas, and the cause is not yet determined or documented.

• Avoid using this code if a more specific anatomical site within the pelvis or thigh is documented (e.g., M89.751 for right femur).
• Ensure the documentation explicitly uses "major osseous defect" or similar terminology indicating a significant bone loss, not just a minor irregularity.
• Always sequence this code after any underlying condition that caused the defect, if known and documented (e.g., osteomyelitis, trauma).