S43.152D Posterior dislocation of left acromioclavicular joint, subsequent encounter

Name of the Condition

• Posterior Dislocation of Left Acromioclavicular Joint, Subsequent Encounter

Summary

This condition involves the displacement of the left acromioclavicular (AC) joint, where the clavicle moves backward relative to the acromion of the scapula. It is a type of shoulder injury that typically results from trauma and may cause pain, instability, or restricted movement. The "subsequent encounter" designation indicates this is a follow-up visit for the injury, not the initial treatment.

Causes

Traumatic events such as falls, direct blows to the shoulder, or forceful movements can lead to posterior dislocation. 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.
• Pain management with medications or injections.
• Surgical intervention may be considered for severe or persistent instability.

Prognosis and Follow-Up

Most patients recover with conservative treatment, though recovery time varies. Follow-up care focuses on monitoring healing, restoring function, and preventing recurrence. Physical therapy is often recommended to improve mobility and stability.

Complications

• Chronic shoulder instability or recurrent dislocation.
• Nerve or blood vessel damage in severe cases.
• Persistent pain or limited range of motion.

Lifestyle & Prevention

• Avoid high-risk activities or use protective gear during sports.
• Strengthen shoulder muscles through targeted exercises.
• Maintain proper posture and avoid repetitive overhead movements.

When to Seek Professional Help

Seek care if pain worsens, swelling increases, or movement becomes severely restricted. Immediate attention is needed if numbness, tingling, or discoloration occurs, as these may indicate nerve or vascular injury.

Tips for Medical Coders

Use this code for a subsequent encounter (D) for posterior dislocation of the left acromioclavicular joint. Document the laterality (left) and encounter type (subsequent) clearly. Ensure clinical notes support the diagnosis and follow-up context to justify the code selection.