M71.38 Other bursal cyst, other site

Name of the Condition

• Other bursal cyst, other site

Summary

An other bursal cyst, other site, is a fluid-filled sac that forms in or around a bursa, a small lubricating structure that reduces friction between tissues. These cysts are non-cancerous and typically result from irritation, inflammation, or structural changes in the bursa, leading to localized swelling or discomfort. The term "other site" indicates the cyst’s location is documented as a specific anatomical area that is not otherwise classified.

Causes

Other bursal cysts can develop due to repetitive motion, direct trauma, or underlying inflammatory conditions affecting the bursa. They may also arise from degenerative processes or mechanical stress on the bursal tissue.

Risk Factors

• Repetitive or prolonged pressure on bursae (e.g., from kneeling, leaning)
• Occupational or athletic activities involving repetitive joint use
• Pre-existing inflammatory conditions (e.g., arthritis)
• Recent injury or surgery near a bursa
• Age-related degenerative changes

Symptoms

• Swelling or a visible lump at the affected site
• Pain or tenderness, especially with movement or pressure
• Limited range of motion in adjacent joints
• Discomfort or stiffness in the area

Diagnosis

Diagnosis typically involves a physical examination to assess cyst characteristics, along with imaging (e.g., ultrasound or MRI) to evaluate tissue changes. Fluid aspiration may be performed if diagnosis is uncertain.

Treatment Options

• Observation for cysts causing no symptoms
• Rest and activity modification to reduce irritation
• Nonsteroidal anti-inflammatory drugs (NSAIDs) for pain and inflammation
• Corticosteroid injections to reduce swelling
• Physical therapy to improve mobility and strength
• Surgical removal for persistent or symptomatic cysts

Prognosis and Follow-Up

Most other bursal cysts resolve with conservative treatment, though recurrence is possible. Follow-up may involve monitoring for symptom improvement or changes in cyst size. Surgical intervention generally has a good prognosis, but recovery time varies by procedure.

Complications

• Infection of the cyst or surrounding tissue
• Persistent pain or limited mobility
• Recurrence after treatment
• Nerve compression if the cyst grows near a nerve

Lifestyle & Prevention

• Avoid repetitive motions or prolonged pressure on joints
• Use protective gear during activities that stress bursae
• Maintain a healthy weight to reduce joint stress
• Perform regular stretching and strengthening exercises
• Address underlying inflammatory conditions promptly

When to Seek Professional Help

Seek medical attention if you experience severe pain, sudden swelling, signs of infection (e.g., redness, fever), or if symptoms worsen despite home care.

Tips for Medical Coders

Document the specific anatomical site of the bursal cyst to ensure accurate coding. For M71.38, confirm the cyst is located in a site not classified elsewhere (e.g., not shoulder, elbow, or knee). Include details on cyst characteristics (e.g., size, symptoms) and any diagnostic or treatment interventions to support code specificity.