S92.345K Nondisplaced fracture of fourth metatarsal bone, left foot, subsequent encounter for fracture with nonunion

Name of the Condition

• Nondisplaced fracture of fourth metatarsal bone, left foot, subsequent encounter for fracture with nonunion
• ICD-10 code: S92.345K

Summary

A nondisplaced fracture of the fourth metatarsal bone in the left foot is a break in the long bone of the forefoot where the bone fragments remain in their normal alignment. This code represents a subsequent encounter for a fracture that has failed to heal (nonunion) after an initial injury. Nonunion occurs when the bone does not properly fuse during the expected healing period, requiring ongoing evaluation and management.

Causes

Direct trauma to the left foot, such as a fall or impact during physical activity, is a common cause of the initial fracture. Nonunion may develop due to inadequate immobilization, poor blood supply to the bone, infection, or underlying conditions that impair healing, such as diabetes or smoking.

Risk Factors

• Participation in high-impact sports or activities with repetitive foot stress
• Wearing improper or non-supportive footwear
• Conditions that weaken bones, such as osteoporosis or vitamin D deficiency
• Advanced age, which may reduce bone density and healing capacity
• Previous foot injuries or fractures
• Lifestyle factors like smoking or poor nutrition that affect bone healing

Symptoms

• Persistent pain localized to the outer midfoot area of the left foot
• Swelling and tenderness at the fracture site
• Difficulty bearing weight or walking on the left foot
• Possible visible or palpable gap at the fracture site if nonunion is severe
• Lack of improvement in symptoms despite prior treatment

Diagnosis

A healthcare provider will perform a physical examination to assess tenderness, swelling, and stability at the fracture site. Imaging studies, such as X-rays or CT scans, are used to confirm nonunion by showing a persistent gap between bone fragments or lack of callus formation. Additional tests may evaluate blood flow or underlying conditions contributing to poor healing.

Treatment Options

Treatment focuses on promoting bone healing and may include immobilization with a cast or brace, bone stimulation therapies (e.g., electrical or ultrasound), or surgical intervention to stabilize the fracture. Pain management and physical therapy may also be recommended to restore function and strength.

Prognosis and Follow-Up

Prognosis depends on the severity of nonunion and response to treatment. Regular follow-up with imaging is necessary to monitor healing progress. Most patients can expect gradual improvement with appropriate management, though recovery may take several months. Long-term follow-up ensures the fracture heals properly and function is restored.

Complications

• Chronic pain or discomfort at the fracture site
• Persistent difficulty with weight-bearing or walking
• Increased risk of future fractures due to weakened bone
• Potential need for additional surgery if nonunion does not resolve
• Infection or other complications if surgical intervention is required

Lifestyle & Prevention

• Wear supportive, properly fitted 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, as it impairs bone healing
• Follow post-treatment guidelines for activity restrictions and rehabilitation

When to Seek Professional Help

Seek medical attention if you experience worsening pain, swelling, or difficulty walking, or if symptoms do not improve with conservative treatment. Prompt evaluation is important to address nonunion and prevent further complications.

Tips for Medical Coders

This code (S92.345K) is used for a subsequent encounter for a nondisplaced fracture of the fourth metatarsal bone in the left foot with nonunion. Documentation should clearly indicate the fracture is nondisplaced, the left foot is involved, and the encounter is subsequent (not initial) due to nonunion. Ensure the record specifies the fracture’s failure to heal and any contributing factors, such as delayed healing or underlying conditions, to support accurate coding.