S43.112A Subluxation of left acromioclavicular joint, initial encounter

Name of the Condition

• Subluxation of Left Acromioclavicular Joint, Initial Encounter

Summary

This condition involves the partial displacement of the left acromioclavicular (AC) joint, where the clavicle meets the acromion of the scapula. It is an initial encounter injury typically resulting from trauma, causing pain, instability, or restricted shoulder movement.

Causes

Traumatic events such as falls, direct blows to the shoulder, or forceful movements can cause subluxation. Sports injuries, motor vehicle accidents, or falls are common triggers.

Risk Factors

• Participation in contact sports or activities with high fall risk.
• Previous shoulder injuries or ligamentous instability.
• Age-related degeneration or connective tissue disorders.
• Occupations requiring repetitive arm or shoulder movements.

Symptoms

• Pain and tenderness around the top of the left shoulder.
• Visible deformity or swelling over the acromioclavicular joint.
• Limited range of motion in the shoulder.
• Sensation of the joint "popping out" or feeling unstable.

Diagnosis

Diagnosis typically involves a physical examination to assess tenderness, deformity, and range of motion. Imaging tests like X-rays may be used to confirm displacement and rule out fractures.

Treatment Options

• Non-surgical treatments such as rest, ice, and physical therapy to restore movement and strength.
• Surgical options in severe cases to stabilize the joint.

Prognosis and Follow-Up

Most cases resolve with conservative treatment, but recovery time varies. Follow-up may include monitoring for stability and gradual return to activity. Severe cases may require longer rehabilitation or surgical intervention.

Complications

• Chronic instability or recurrent subluxation.
• Persistent pain or limited mobility.
• Nerve or vascular damage in rare cases.
• Post-traumatic arthritis over time.

Lifestyle & Prevention

• Use protective gear during contact sports.
• Strengthen shoulder muscles to improve stability.
• Avoid high-risk activities if previous injuries exist.
• Maintain proper posture and body mechanics.

When to Seek Professional Help

Seek care if pain is severe, movement is significantly restricted, or deformity is present. Immediate evaluation is needed for signs of nerve or vascular compromise.

Tips for Medical Coders

Document the laterality (left) and encounter type (initial) clearly. Ensure clinical notes specify the injury as subluxation, not dislocation, and confirm no fracture is present. Use this code for the first encounter of the injury.