M86.361 Chronic multifocal osteomyelitis, right tibia and fibula

Name of the Condition

• Chronic multifocal osteomyelitis, right tibia and fibula

Summary

Chronic multifocal osteomyelitis (CMO) is a condition characterized by persistent inflammation of the bone, often affecting multiple sites, including the right tibia and fibula. It presents as long-lasting and recurrent episodes of bone inflammation without a clear infectious cause.

Causes

The exact causes of CMO are not well-understood. It is thought to be multifactorial, potentially involving genetic predisposition and autoimmune responses rather than infections, which are common causes of other forms of osteomyelitis.

Risk Factors

• Family history of autoimmune or inflammatory disorders
• Certain genetic mutations
• Age, with children and adolescents more commonly affected

Symptoms

• Persistent bone pain
• Swelling and redness over the affected bones
• Fever during flares
• Reduced mobility in severe cases

Diagnosis

Diagnosis involves a combination of clinical examination, detailed medical history, imaging studies (such as X-rays, MRI, or CT scans), and laboratory tests to assess inflammatory markers. A bone biopsy may be performed in uncertain cases to rule out infection or other conditions.

Treatment Options

• Nonsteroidal anti-inflammatory drugs (NSAIDs) to reduce pain and inflammation
• Corticosteroids in cases of severe inflammation
• Biological therapies or disease-modifying anti-rheumatic drugs (DMARDs) may be used in refractory cases
• Physical therapy to maintain mobility

Prognosis and Follow-Up

Prognosis varies, with some patients experiencing periods of remission and others having persistent symptoms. Regular follow-up with a healthcare provider is important to monitor disease activity and adjust treatment as needed.

Complications

• Chronic pain
• Bone deformity
• Reduced mobility
• Potential for secondary infections

Lifestyle & Prevention

• Maintain a healthy diet to support bone health
• Engage in regular, low-impact exercise to preserve mobility
• Avoid activities that may worsen bone pain or inflammation

When to Seek Professional Help

Seek medical attention if you experience persistent bone pain, swelling, or fever, or if symptoms worsen despite treatment.

Tips for Medical Coders

Document the specific location (right tibia and fibula) and confirm the chronic, multifocal nature of the osteomyelitis. Ensure clinical documentation supports the diagnosis and excludes infectious causes when applicable.