M61.019 Myositis ossificans traumatica, unspecified shoulder

Name of the Condition

• Myositis Ossificans Traumatica, Unspecified Shoulder

Summary

Myositis ossificans traumatica of the unspecified shoulder is a condition marked by abnormal bone formation within the shoulder muscle tissue, typically following trauma. This process results in a hard, painful mass that can limit shoulder movement and cause discomfort.

Causes

The condition is primarily caused by direct trauma to the shoulder muscle, such as a contusion or injury. It may also result from surgical procedures or repetitive stress to the shoulder area.

Risk Factors

• History of shoulder muscle trauma or injury
• Participation in contact sports or high-impact activities involving the shoulder
• Surgical intervention involving shoulder muscle tissue
• Delayed or inadequate treatment of initial shoulder injury

Symptoms

• Pain and tenderness at the shoulder injury site
• Swelling and inflammation in the shoulder
• A palpable, firm mass within the shoulder muscle
• Reduced range of motion or stiffness in the shoulder
• Possible fever or warmth in the area

Diagnosis

Diagnosis is based on clinical evaluation and imaging studies, such as X-rays, CT scans, or MRI, which can visualize the characteristic calcified or ossified lesion in the shoulder. Biopsies are rarely needed but may be considered to rule out other conditions.

Treatment Options

• Rest and immobilization to reduce further injury
• Nonsteroidal anti-inflammatory drugs (NSAIDs) to manage pain and inflammation
• Physical therapy to restore mobility and strength
• Surgical intervention in severe or persistent cases

Prognosis and Follow-Up

Most cases resolve with conservative treatment, though recovery may take several months. Follow-up imaging may be used to monitor lesion progression or regression. Persistent symptoms or functional limitations may require ongoing therapy or surgical evaluation.

Complications

• Chronic pain or stiffness
• Reduced shoulder mobility
• Recurrent injury due to altered muscle mechanics
• Nerve compression from the ossified mass

Lifestyle & Prevention

• Use proper protective gear during high-risk activities
• Seek prompt treatment for shoulder injuries
• Avoid overexertion or repetitive stress to the shoulder
• Maintain strength and flexibility through regular exercise

When to Seek Professional Help

Consult a healthcare provider if shoulder pain persists, worsens, or is accompanied by significant swelling, fever, or loss of function. Early evaluation can help prevent complications and guide appropriate management.

Tips for Medical Coders

Document the specific shoulder affected (e.g., right, left, or unspecified) and any associated trauma or surgical history. Ensure clinical notes support the diagnosis and specify the anatomical location to justify code assignment.