Other ossification of muscle, right thigh

This code signifies the abnormal formation of bone tissue within the muscle of the right thigh, a condition known as heterotopic ossification or myositis ossificans. This ossification is not related to a specific traumatic event or progressive genetic disorder but rather falls under a broader category of other causes.

Apply this code when documentation clearly indicates the presence of non-traumatic, non-progressive ossification within the musculature of the patient's right thigh. This diagnosis is typically supported by imaging studies (e.g., X-ray, CT scan) confirming the bone formation in the muscle and clinical notes ruling out specific traumatic or genetic etiologies.

• Ensure laterality is explicitly documented as "right thigh" to support this specific code.
• Differentiate from M61.0- (myositis ossificans traumatica) and M61.1- (myositis ossificans progressiva) based on documented etiology.
• Look for documentation specifying the absence of a clear traumatic event or a diagnosis of fibrodysplasia ossificans progressiva.