M71.31 Other bursal cyst, shoulder

Name of the Condition

• Other bursal cyst, shoulder

Summary

An other bursal cyst in the shoulder 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 in the shoulder region.

Causes

Other bursal cysts in the shoulder 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 overhead activities)
• Occupational or athletic activities involving repetitive shoulder use
• Pre-existing inflammatory conditions (e.g., arthritis)
• Recent injury or surgery near a shoulder bursa
• Age-related degenerative changes

Symptoms

• Swelling or a visible lump at the affected shoulder site
• Pain or tenderness, especially with movement or pressure
• Limited range of motion in the shoulder
• 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 significant symptoms
• Aspiration to drain the fluid and reduce swelling
• Corticosteroid injections to reduce inflammation
• Surgical removal for persistent, painful, or recurrent cysts

Prognosis and Follow-Up

Most other bursal cysts in the shoulder resolve with conservative treatment, though recurrence is possible. Follow-up may involve monitoring for symptom improvement or repeat imaging if symptoms persist. Physical therapy may be recommended to restore function and reduce recurrence risk.

Complications

• Recurrence of the cyst
• Persistent pain or limited mobility
• Infection if the cyst is aspirated or drained
• Nerve compression if the cyst grows large enough to affect nearby structures

Lifestyle & Prevention

• Avoid repetitive overhead movements or modify activities to reduce strain
• Use proper ergonomics during work or sports
• Apply ice to the shoulder after strenuous activity to reduce inflammation
• Maintain shoulder strength and flexibility through gentle exercises

When to Seek Professional Help

Seek medical attention if you experience severe or worsening pain, sudden swelling, inability to move the shoulder, signs of infection (e.g., redness, warmth), or if symptoms do not improve with home care.

Tips for Medical Coders

Document the location (shoulder) and clinical findings (e.g., cyst characteristics, symptoms) to support the M71.31 code. Include details on imaging or aspiration if performed, as these may influence coding specificity. Ensure documentation aligns with the clinical presentation of a shoulder bursal cyst.