S42.018K Nondisplaced fracture of sternal end of left clavicle, subsequent encounter for fracture with nonunion

Name of the Condition

• Nondisplaced fracture of sternal end of left clavicle, subsequent encounter for fracture with nonunion (ICD-10 Code: S42.018K)

Summary

This condition describes a break at the sternal (chest) end of the left clavicle where the bone fragments remain aligned, but the fracture has failed to heal properly (nonunion) during a subsequent encounter. The clavicle, or collarbone, connects the arm to the body and is prone to fractures due to its exposed position. Nondisplaced fractures involve minimal misalignment, but nonunion indicates delayed or incomplete healing, requiring ongoing management.

Causes

The fracture typically results from direct trauma to the shoulder or chest, such as a fall, accident, or forceful impact. Nonunion may occur due to inadequate immobilization, poor blood supply to the fracture site, or underlying factors like smoking, diabetes, or nutritional deficiencies that impair healing.

Risk Factors

Factors increasing the risk include participation in high-impact sports, osteoporosis, older age, and conditions that affect bone healing (e.g., diabetes, smoking). Previous fractures or inadequate initial treatment may also contribute to nonunion.

Symptoms

Symptoms often include persistent localized pain at the sternal end of the left clavicle, swelling, tenderness, and limited shoulder movement. The area may feel unstable, and pain may worsen with activity.

Diagnosis

Diagnosis involves a physical exam to assess pain, swelling, and mobility. Imaging, such as X-rays or CT scans, confirms the fracture and evaluates for nonunion by checking for a persistent gap or lack of bone healing over time.

Treatment Options

Treatment may include immobilization with a sling, pain management, and physical therapy to restore function. In cases of nonunion, surgical intervention (e.g., bone grafting, fixation) may be necessary to promote healing.

Prognosis and Follow-Up

Prognosis depends on the severity of nonunion and response to treatment. Follow-up imaging monitors healing, and regular appointments ensure the fracture progresses or addresses complications. Most patients recover with appropriate care, though recovery may take longer than typical fractures.

Complications

Complications can include chronic pain, reduced shoulder function, or progression to a displaced fracture. Nonunion increases the risk of long-term mobility issues if untreated.

Lifestyle & Prevention

Preventive measures include using protective gear during sports, maintaining bone health through diet and exercise, and avoiding high-risk activities. For those with nonunion, adherence to treatment plans and lifestyle modifications (e.g., smoking cessation) supports healing.

When to Seek Professional Help

Seek care if pain worsens, swelling increases, or mobility declines. Persistent symptoms after initial treatment warrant evaluation to rule out nonunion or other complications.

Tips for Medical Coders

Document the subsequent encounter and confirmation of nonunion clearly. Include details on prior treatment, imaging results, and clinical findings to support the diagnosis. Ensure the fracture’s location (sternal end of left clavicle) and nonunion status are well-documented for accurate coding.