S92.312K Displaced fracture of first metatarsal bone, left foot, subsequent encounter for fracture with nonunion

Name of the Condition

• Displaced fracture of first metatarsal bone, left foot, subsequent encounter for fracture with nonunion
• ICD-10 Code: S92.312K

Summary

This condition involves a displaced fracture of the first metatarsal bone in the left foot, where the bone fragments are shifted out of their normal alignment. It is classified as a subsequent encounter, indicating ongoing care for the fracture, and is associated with nonunion, meaning the bone has failed to heal properly. The first metatarsal is a critical weight-bearing structure in the foot, and displacement with nonunion can significantly impact mobility and stability.

Causes

Direct trauma or impact to the left foot is the primary cause, such as a fall, sports injury, or high-force impact. In cases of nonunion, factors like inadequate immobilization, poor blood supply to the bone, or underlying health conditions may prevent proper healing after the initial injury.

Risk Factors

• Participation in high-impact activities or sports
• Wearing improper or non-supportive footwear
• Conditions that impair bone healing (e.g., diabetes, smoking)
• Previous fractures or delayed treatment of the initial injury
• Advanced age or reduced bone density

Symptoms

• Persistent pain at the fracture site, even after initial healing attempts
• Swelling or bruising that does not resolve
• Difficulty bearing weight on the left foot
• Possible visible deformity or instability in the foot
• Limited range of motion in the big toe or midfoot

Diagnosis

A healthcare provider will conduct a physical examination to assess pain, swelling, and mobility. Imaging studies, such as X-rays or CT scans, are typically used to confirm the fracture, evaluate displacement, and assess for nonunion. Additional tests may be ordered to identify underlying factors contributing to poor healing.

Treatment Options

Treatment focuses on promoting bone healing and restoring function. Options may include immobilization with a cast or brace, surgical intervention to realign and stabilize the bone (e.g., internal fixation), or bone grafting to stimulate healing. Physical therapy is often recommended to improve strength and mobility once the fracture shows signs of healing.

Prognosis and Follow-Up

Prognosis depends on the severity of the nonunion and the effectiveness of treatment. With appropriate intervention, many patients achieve improved healing and function, though recovery may be prolonged. Regular follow-up appointments and imaging are necessary to monitor progress and adjust treatment as needed.

Complications

• Chronic pain or instability in the foot
• Increased risk of arthritis in the affected joint
• Persistent difficulty with weight-bearing or walking
• Need for additional surgeries if healing does not occur

Lifestyle & Prevention

• Wear supportive, properly fitting footwear to reduce injury risk
• Avoid high-impact activities that strain the foot
• Maintain bone health through a balanced diet and regular exercise
• Seek prompt treatment for foot injuries to prevent complications

When to Seek Professional Help

Consult a healthcare provider if you experience persistent pain, swelling, or difficulty walking after a foot injury, or if symptoms worsen despite initial treatment. Early evaluation is important to address nonunion and prevent long-term complications.

Tips for Medical Coders

Document the encounter as a subsequent visit for fracture care with nonunion. Ensure clinical notes specify the fracture’s displacement, location (left foot, first metatarsal), and the absence of healing. Code S92.312K is appropriate when the fracture is being treated during a follow-up visit and nonunion is confirmed.