S92.346K Nondisplaced fracture of fourth metatarsal bone, unspecified foot, subsequent encounter for fracture with nonunion

Name of the Condition

• Nondisplaced fracture of fourth metatarsal bone, unspecified foot, subsequent encounter for fracture with nonunion
• ICD-10 code: S92.346K

Summary

A nondisplaced fracture of the fourth metatarsal bone is a break in the forefoot bone where the fragments remain in their normal alignment. This code applies to a subsequent encounter for care, indicating the patient is returning for follow-up, and the fracture has failed to heal (nonunion) after an expected period.

Causes

Direct trauma to the foot, such as a fall or impact during physical activity, is a common cause. Nonunion may result from inadequate immobilization, poor blood supply to the bone, or persistent stress on the fracture site.

Risk Factors

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

Symptoms

• Persistent pain localized to the outer midfoot area
• Swelling and bruising around the affected bone
• Difficulty bearing weight or walking on the foot
• Possible tenderness to touch
• No visible improvement in symptoms over time

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 alignment. Additional tests, like CT scans or MRI, may be ordered to assess bone healing and detect nonunion.

Treatment Options

• Immobilization with a cast or boot to stabilize the fracture
• Surgical intervention, such as bone grafting or internal fixation, if nonunion persists
• Pain management with NSAIDs or acetaminophen
• Physical therapy to restore strength and mobility

Prognosis and Follow-Up

Prognosis depends on the severity of nonunion and treatment response. Most patients recover with appropriate intervention, but healing may take longer than usual. Regular follow-up appointments are necessary to monitor progress and adjust treatment as needed.

Complications

• Chronic pain or discomfort
• Persistent difficulty walking or bearing weight
• Increased risk of future fractures
• Need for additional surgical procedures

Lifestyle & Prevention

• Wear supportive 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

When to Seek Professional Help

Seek medical attention if you experience persistent pain, swelling, or difficulty walking after a foot injury, or if symptoms worsen over time.

Tips for Medical Coders

This code is used for a subsequent encounter for a nondisplaced fourth metatarsal fracture with nonunion. Document the fracture's status (nondisplaced), location (unspecified foot), and the reason for the encounter (nonunion). Ensure clinical notes support the nonunion diagnosis and subsequent care.