Other ossification of muscle, unspecified thigh

This code signifies the presence of abnormal bone formation within the muscle tissue of an unspecified thigh. This ossification is not due to a specific, known cause like trauma (myositis ossificans traumatica) or a genetic disorder. It represents a non-traumatic, non-hereditary calcification or bone growth within the muscle.

Use this code when documentation indicates heterotopic ossification or calcification within the thigh muscle, and the specific thigh (left or right) is not documented. This diagnosis is typically supported by imaging studies (e.g., X-ray, CT scan) showing bone formation within the muscle, without a clear history of trauma or a diagnosed genetic condition predisposing to ossification.

• Ensure the documentation explicitly states "unspecified thigh" or lacks laterality for the thigh.
• Differentiate from M61.0- (Myositis ossificans traumatica) if a clear history of trauma is present.
• Avoid using this code if a more specific type of ossification (e.g., progressive, post-surgical) is documented.