S92.342K Displaced fracture of fourth metatarsal bone, left foot, subsequent encounter for fracture with nonunion

Name of the Condition

• Displaced fracture of fourth metatarsal bone, left foot, subsequent encounter for fracture with nonunion
• ICD-10 code: S92.342K

Summary

A displaced fracture of the fourth metatarsal bone in the left foot, with nonunion, is a break in the long bone connecting the ankle to the toes where the bone fragments have shifted out of alignment and failed to heal properly. This condition occurs during a subsequent encounter, meaning it follows an initial treatment phase and requires evaluation for delayed or incomplete healing.

Causes

Direct trauma to the left foot, such as a fall, impact during sports, or a heavy object dropped on the foot, is the primary cause. Nonunion may result from inadequate immobilization, poor blood supply to the bone, infection, or excessive movement during the healing process.

Risk Factors

• Participation in high-impact sports (e.g., soccer, basketball)
• Wearing improper or non-supportive footwear
• Conditions that weaken bones, such as osteoporosis
• Advanced age, which may reduce bone density and balance
• Smoking, which impairs bone healing
• Previous foot injuries or fractures

Symptoms

• Persistent pain and tenderness localized to the outer midfoot
• Swelling and bruising around the affected area
• Difficulty bearing weight or walking on the left foot
• Possible visible deformity if the fracture is severely displaced
• No improvement in symptoms despite prior treatment

Diagnosis

A healthcare provider will perform a physical examination to assess pain, swelling, and range of motion. Imaging tests, such as X-rays, are typically used to confirm the fracture and evaluate for nonunion. Additional tests, like CT scans or bone scans, may be ordered to assess bone healing and blood flow.

Treatment Options

Treatment depends on the severity of the nonunion and may include immobilization with a cast or brace, surgical intervention to realign and stabilize the bone (e.g., internal fixation), bone grafting to promote healing, or physical therapy to restore function. Pain management and activity modification are also part of the plan.

Prognosis and Follow-Up

Prognosis varies based on the extent of the nonunion and treatment response. Regular follow-up with imaging is necessary to monitor healing. Most patients can expect improved function with appropriate treatment, though recovery may take several months. Long-term follow-up may be required to assess for complications.

Complications

• Chronic pain or discomfort
• Persistent difficulty walking or bearing weight
• Increased risk of future fractures
• Infection (if surgery is performed)
• Arthritis in the surrounding joints

Lifestyle & Prevention

• Wear supportive, properly fitting footwear to reduce stress on the foot.
• Avoid high-impact activities until cleared by a healthcare provider.
• Maintain a healthy diet rich in calcium and vitamin D to support bone health.
• Quit smoking to improve bone healing.
• Gradually return to activity under medical guidance.

When to Seek Professional Help

Seek care if you experience persistent pain, swelling, or difficulty walking after a foot injury, or if symptoms worsen despite treatment. Immediate attention is needed for signs of infection, such as redness, warmth, or drainage from the fracture site.

Tips for Medical Coders

Document the subsequent encounter for fracture with nonunion, including details of prior treatment, imaging results, and clinical findings supporting delayed healing. Ensure the left foot and fourth metatarsal bone are clearly specified. Note any surgical interventions or bone grafting procedures, as these may impact coding.