S49.132K Salter-Harris Type III physeal fracture of lower end of humerus, left arm, subsequent encounter for fracture with nonunion

Name of the Condition

• Salter-Harris Type III physeal fracture of lower end of humerus, left arm, subsequent encounter for fracture with nonunion (ICD-10 Code: S49.132K)

Summary

This code describes a Salter-Harris Type III fracture involving the growth plate (physeal) at the lower end of the left humerus, with nonunion during a subsequent encounter. The fracture extends through the growth plate and into the adjacent epiphysis, and nonunion indicates the fracture has not healed properly. This type of injury is common in children and adolescents due to the relative weakness of the growth plate during development. The injury affects the distal humeral physis, where the upper arm bone meets the elbow joint, and may involve the articular surface.

Causes

Trauma is the primary cause, often resulting from a fall onto an outstretched hand or a direct blow to the elbow. Sports-related injuries, such as those from contact sports or activities involving forceful arm movement, are frequent mechanisms. The force applied to the elbow can disrupt the growth plate and extend into the epiphysis, potentially affecting joint alignment. Nonunion may occur due to inadequate immobilization, poor blood supply, or excessive movement at the fracture site.

Risk Factors

• Age (most common in children and adolescents with open growth plates)
• Participation in high-impact or contact sports
• Prior growth plate injuries or developmental abnormalities
• Activities involving repetitive stress on the elbow
• Inadequate initial treatment or immobilization

Symptoms

• Persistent pain and swelling localized to the elbow or lower arm
• Tenderness over the distal humeral growth plate
• Limited range of motion in the elbow or arm
• Visible deformity or abnormal movement at the fracture site
• Possible clicking or grinding sensations during movement

Diagnosis

Diagnosis involves a thorough clinical evaluation, including a detailed history of the injury and physical examination to assess pain, swelling, and range of motion. Imaging studies, such as X-rays or CT scans, are typically used to confirm the fracture type, assess for nonunion, and evaluate joint alignment. Additional tests, like MRI, may be performed to assess soft tissue damage or blood supply to the bone.

Treatment Options

Treatment focuses on promoting fracture healing and restoring function. Options may include surgical intervention, such as internal fixation, to stabilize the fracture and encourage union. Non-surgical approaches, like prolonged immobilization or bone grafting, may be considered depending on the severity. Physical therapy is often recommended to improve range of motion and strength once healing progresses.

Prognosis and Follow-Up

Prognosis depends on the severity of the nonunion and the effectiveness of treatment. With appropriate intervention, many patients achieve successful healing and restored function. Follow-up care is essential to monitor healing progress, adjust treatment plans, and address any complications. Regular imaging and clinical assessments help ensure the fracture heals properly and joint function is preserved.

Complications

• Persistent nonunion or delayed healing
• Joint stiffness or limited range of motion
• Growth disturbances or limb length discrepancy
• Arthritis or chronic pain in the affected joint
• Nerve or blood vessel damage

Lifestyle & Prevention

• Avoid high-impact activities until cleared by a healthcare provider
• Use protective equipment during sports or activities
• Follow prescribed immobilization and rehabilitation protocols
• Maintain a healthy diet rich in calcium and vitamin D to support bone healing
• Attend all follow-up appointments to monitor progress

When to Seek Professional Help

Seek immediate medical attention if you experience severe pain, swelling, or deformity after an injury. Contact your healthcare provider if symptoms worsen, or if you notice persistent pain, limited movement, or signs of infection (e.g., redness, fever) during recovery.

Tips for Medical Coders

This code is specific to a subsequent encounter for a Salter-Harris Type III physeal fracture of the left humerus with nonunion. Document the encounter type (subsequent) and the presence of nonunion clearly. Ensure the fracture location (left arm) and type (Salter-Harris III) are accurately recorded to support code assignment. Verify that the fracture is not healing as expected, as this is critical for using the "with nonunion" modifier.