S44.22 Injury of radial nerve at upper arm level, left arm

Name of the Condition

• Injury of radial nerve at upper arm level, left arm

Summary

This condition involves damage or trauma to the radial nerve at the upper arm level, affecting the left arm. The radial nerve is a major peripheral nerve that runs along the back of the arm and is responsible for sensation and movement in parts of the forearm, wrist, and hand. Injury may impair motor function, sensation, or cause pain in the affected area.

Causes

Direct trauma or injury to the upper arm, such as from falls, vehicle collisions, or sports-related impacts. Compression injuries from prolonged pressure on the nerve, often due to tight casts, splints, or prolonged arm positioning. Penetrating injuries, such as lacerations or stab wounds, that damage the nerve. Iatrogenic causes, including surgical procedures or medical interventions involving the upper arm.

Risk Factors

• Participation in high-risk physical activities or contact sports that increase the likelihood of arm trauma.
• Occupations requiring repetitive arm movements, heavy lifting, or prolonged pressure on the upper arm.
• Previous injuries or surgeries in the upper arm area that may have weakened or scarred the nerve.
• Conditions that cause nerve compression, such as tumors or cysts near the nerve.

Symptoms

• Pain, burning, or tingling along the back of the arm or forearm.
• Numbness or loss of sensation in the back of the hand or fingers.
• Weakness in wrist or finger extension, leading to difficulty gripping objects.
• Drooping of the wrist (wrist drop) due to muscle weakness.

Diagnosis

Diagnosis typically involves a physical examination to assess motor and sensory function, including testing wrist and finger strength. Imaging studies, such as MRI or ultrasound, may be used to identify structural damage or compression. Nerve conduction studies or electromyography (EMG) can help evaluate nerve function and localize the injury.

Treatment Options

Treatment depends on the severity and cause of the injury. Mild cases may resolve with rest, physical therapy, and pain management. Severe or persistent injuries may require surgical intervention to repair or decompress the nerve. Rehabilitation, including exercises to restore strength and function, is often recommended.

Prognosis and Follow-Up

Prognosis varies based on the extent of nerve damage and timely treatment. Mild injuries may recover fully with conservative management, while severe injuries may result in permanent deficits. Regular follow-up with a healthcare provider is important to monitor recovery and adjust treatment as needed.

Complications

Potential complications include chronic pain, persistent numbness or weakness, and permanent loss of function. Delayed or inadequate treatment may increase the risk of long-term disability.

Lifestyle & Prevention

Avoid activities that put excessive pressure on the upper arm. Use proper protective gear during sports or high-risk activities. Maintain good posture and avoid prolonged arm positioning that could compress the nerve. Early medical attention after arm injuries can help prevent further damage.

When to Seek Professional Help

Seek immediate medical care if you experience sudden weakness, numbness, or pain in the arm, especially after trauma. Persistent symptoms or worsening function should prompt evaluation by a healthcare provider to prevent complications.

Tips for Medical Coders

Use this code for documented injury of the radial nerve at the upper arm level affecting the left arm. Ensure clinical documentation specifies the nerve, anatomical level, and affected side to support accurate coding. Verify that the injury is not better described by another code and that the left arm involvement is clearly documented.