S82.446K Nondisplaced spiral fracture of shaft of unspecified fibula, subsequent encounter for closed fracture with nonunion

Name of the Condition

• Nondisplaced spiral fracture of shaft of unspecified fibula, subsequent encounter for closed fracture with nonunion

Summary

A nondisplaced spiral fracture of the fibular shaft is a bone break with a helical pattern along the shaft of the fibula, where the bone fragments remain aligned. This fracture is classified as closed (no skin penetration) and is associated with nonunion, meaning the fracture has not healed properly during a subsequent encounter. It typically results from twisting forces applied to the leg and may cause persistent pain and limited mobility.

Causes

Most commonly caused by twisting injuries to the lower leg, such as those sustained during sports, falls, or accidents. High-impact trauma, including direct blows or rotational forces, can also lead to this type of fracture. Nonunion may occur due to inadequate immobilization, poor blood supply, or underlying health conditions affecting bone healing.

Risk Factors

• Participation in activities with high rotational stress (e.g., skiing, gymnastics).
• Osteoporosis or reduced bone density.
• Previous lower leg injuries or fractures.
• Advanced age, which may weaken bone strength.
• Smoking or other factors that impair bone healing.

Symptoms

• Persistent pain and swelling in the lower leg.
• Bruising and tenderness at the fracture site.
• Inability to bear weight on the affected leg.
• Possible deformity or instability of the leg.
• Delayed healing or lack of improvement over time.

Diagnosis

Diagnosis involves a physical examination to assess pain, swelling, and deformity. X-rays are typically used to confirm the fracture and its spiral pattern, as well as to evaluate for nonunion. Additional imaging, such as CT or MRI, may be ordered to assess bone healing and soft tissue involvement. Clinical history of prior fracture and lack of healing progress are also considered.

Treatment Options

Treatment may include immobilization with a cast or brace to stabilize the fracture. Surgical intervention, such as bone grafting or internal fixation, may be necessary to promote healing in cases of nonunion. Physical therapy is often recommended to restore strength and mobility once healing progresses.

Prognosis and Follow-Up

Prognosis depends on the success of treatment and the underlying factors contributing to nonunion. Regular follow-up with imaging is typically required to monitor healing. Full recovery may take several months, and some patients may experience long-term limitations in mobility or function.

Complications

• Chronic pain or discomfort.
• Persistent nonunion requiring additional intervention.
• Increased risk of future fractures.
• Limited mobility or functional impairment.
• Potential need for surgical correction.

Lifestyle & Prevention

• Avoid high-impact or rotational activities until cleared by a healthcare provider.
• Maintain a healthy diet rich in calcium and vitamin D to support bone health.
• Use protective equipment during sports or activities with fall risks.
• Follow post-injury care instructions to optimize healing.

When to Seek Professional Help

Seek medical attention if pain worsens, swelling increases, or there is new deformity. Contact a healthcare provider if there is no improvement in symptoms after initial treatment or if mobility remains significantly limited.

Tips for Medical Coders

This code represents a subsequent encounter for a closed fracture with nonunion. Documentation should clearly indicate the fracture type (nondisplaced spiral), location (shaft of unspecified fibula), encounter type (subsequent), and the presence of nonunion. Ensure clinical notes support the nonunion diagnosis and that the fracture remains closed.