S42.018A Nondisplaced fracture of sternal end of left clavicle, initial encounter for closed fracture

Name of the Condition

• Nondisplaced fracture of sternal end of left clavicle, initial encounter for closed fracture (ICD-10 Code: S42.018A)

Summary

This condition involves a break at the sternal (chest) end of the left clavicle where the bone fragments remain aligned and the fracture is not open to the skin. The clavicle, or collarbone, connects the arm to the body and is a common site for fractures due to its exposed position. Nondisplaced fractures typically involve minor cracks or breaks without significant misalignment, which may simplify management and healing.

Causes

Fractures of the clavicle’s sternal end typically result from direct trauma to the shoulder or chest, such as a fall onto the shoulder, a blow to the chest, or a motor vehicle accident. The nondisplaced nature indicates the force was sufficient to break the bone but not enough to shift the fragments out of place.

Risk Factors

Factors increasing the risk include participation in contact sports, osteoporosis or reduced bone density, and activities with a high risk of falls or collisions. Older adults may be more susceptible due to age-related bone changes, while younger individuals may experience fractures from sports or accidents.

Symptoms

Symptoms often include localized pain at the sternal end of the left clavicle, swelling, bruising, and tenderness. A visible or palpable deformity may be present, along with difficulty moving the shoulder or arm due to pain. The area may feel unstable or tender to touch.

Diagnosis

Diagnosis begins with a physical examination to assess pain, swelling, and deformity. X-ray imaging is used to confirm the fracture and verify that it is nondisplaced and closed. Additional imaging like CT or MRI may be considered for complex cases or if other injuries are suspected.

Treatment Options

Treatment typically includes immobilization with a sling or brace to support the arm and reduce movement. Pain management with over-the-counter or prescription medications may be recommended. Physical therapy is often introduced later to restore strength and mobility once healing progresses.

Prognosis and Follow-Up

Most nondisplaced fractures heal well with conservative management, and full recovery is common within 6–8 weeks. Follow-up appointments monitor healing through physical exams and imaging, ensuring the fracture remains aligned and symptoms improve. Return to normal activities is gradual, guided by pain and functional recovery.

Complications

While rare, complications can include delayed healing, nonunion (failure to heal), or malunion (misaligned healing). Nerve or blood vessel injury near the fracture site is uncommon but possible. Infection is not a risk for closed fractures.

Lifestyle & Prevention

Preventive measures include using protective gear during contact sports, maintaining bone health through diet and exercise, and avoiding high-risk activities. Strengthening shoulder and upper body muscles may help absorb impact and reduce fracture risk.

When to Seek Professional Help

Seek care if pain worsens, swelling increases, or a deformity becomes more noticeable. Immediate attention is needed if numbness, tingling, or changes in arm color or temperature occur, as these may indicate nerve or vascular involvement.

Tips for Medical Coders

Document the fracture location (sternal end of left clavicle), displacement status (nondisplaced), encounter type (initial), and fracture type (closed) to support code S42.018A. Ensure clinical notes specify the absence of displacement and that the fracture is closed, as these details are critical for accurate coding.