S49.142A Salter-Harris Type IV physeal fracture of lower end of humerus, left arm, initial encounter for closed fracture

Name of the Condition

• Salter-Harris Type IV physeal fracture of lower end of humerus, left arm, initial encounter for closed fracture (ICD-10 Code: S49.142A)

Summary

This code describes a Salter-Harris Type IV fracture involving the growth plate (physeal) at the lower end of the left humerus, with an initial encounter for a closed fracture. Type IV fractures extend through the metaphysis, physis, and epiphysis, potentially disrupting both growth and joint alignment. These injuries are uncommon but serious, as they may affect long-term bone development and joint function.

Causes

Trauma is the primary cause, typically resulting from a fall onto an outstretched hand, a direct blow to the elbow, or forceful arm movement. High-impact activities, such as sports or accidents, can generate the necessary force to cause this fracture type.

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

Symptoms

• Pain and swelling localized to the elbow or lower arm
• Tenderness over the distal humeral growth plate
• Limited range of motion in the affected arm
• Possible visible deformity in severe cases
• Difficulty moving or bearing weight on the arm

Diagnosis

Diagnosis relies on a physical examination and imaging studies, such as X-rays or CT scans, to confirm the fracture type and assess displacement. The fracture line typically extends vertically through the metaphysis, physis, and epiphysis, distinguishing it from other Salter-Harris types. Clinical correlation with the mechanism of injury is essential for accurate classification.

Treatment Options

Treatment depends on fracture displacement and stability. Nondisplaced fractures may be managed with immobilization (e.g., casting) and close monitoring. Displaced fractures often require surgical intervention to realign the bone and stabilize the growth plate, using pins or screws. Postoperative care includes immobilization and gradual rehabilitation to restore function.

Prognosis and Follow-Up

Prognosis varies based on fracture severity and treatment timing. Early intervention improves outcomes, but there is a risk of growth disturbance or joint stiffness. Follow-up appointments are necessary to monitor healing, assess range of motion, and evaluate for complications. Long-term monitoring may be required to detect late effects on bone growth.

Complications

Potential complications include growth plate arrest, limb length discrepancy, joint instability, or arthritis. Infection or malunion can occur with surgical treatment. Prompt recognition and management reduce the risk of adverse outcomes.

Lifestyle & Prevention

Preventive measures include using protective gear during sports, avoiding high-risk activities, and ensuring proper technique to reduce fall risks. Strengthening exercises and balance training may help minimize injury likelihood. Parents and caregivers should supervise children during activities with potential for elbow trauma.

When to Seek Professional Help

Seek immediate medical attention for severe pain, visible deformity, inability to move the arm, or signs of nerve injury (e.g., numbness, weakness). Delayed care can worsen displacement and complicate treatment.

Tips for Medical Coders

This code requires documentation of the fracture type (Salter-Harris IV), anatomical site (lower end of humerus, left arm), encounter type (initial), and fracture status (closed). Ensure the medical record specifies the fracture’s characteristics (e.g., displacement, stability) and confirms the left arm involvement. Use this code only for initial encounters; subsequent encounters use different codes.