S82.421M Displaced transverse fracture of shaft of right fibula, subsequent encounter for open fracture type I or II with nonunion

Name of the Condition

• Displaced transverse fracture of shaft of right fibula, subsequent encounter for open fracture type I or II with nonunion
• ICD-10 Code: S82.421M

Summary

This condition describes a displaced transverse fracture of the right fibula's shaft, where the bone fragments are misaligned and the fracture line runs horizontally. The fracture is open (skin is pierced) and classified as type I or II, indicating minimal soft tissue damage. The term "nonunion" signifies that the fracture has failed to heal properly after an expected period. This is a subsequent encounter, meaning the patient is receiving ongoing care for the established nonunion.

Causes

Most commonly caused by direct trauma or high-force impact to the lower leg, such as from falls, motor vehicle accidents, or sports injuries. Open fractures may result from the bone fragment piercing the skin during the injury. Nonunion can develop due to inadequate immobilization, poor blood supply, infection, or excessive movement at the fracture site.

Risk Factors

• Participation in contact sports or high-impact activities.
• Osteoporosis or reduced bone density, which increases fragility.
• Advanced age, which may weaken bone strength.
• Previous leg injuries or surgeries.
• Smoking, which impairs bone healing.
• Certain medical conditions (e.g., diabetes) that affect circulation or healing.

Symptoms

• Persistent pain at the fracture site, often worsening with activity.
• Swelling and tenderness that may not resolve over time.
• Difficulty bearing weight on the affected leg.
• Possible deformity or instability of the leg structure.
• Open wound at the fracture site (for open fractures).
• Limited range of motion in the ankle or knee.

Diagnosis

Diagnosis involves a physical examination by a healthcare professional to assess tenderness, swelling, and deformity. Imaging tests, such as X-rays, are typically used to confirm the fracture, evaluate alignment, and assess for nonunion. Additional tests, like CT scans or bone scans, may be ordered to evaluate healing progress or detect complications.

Treatment Options

Treatment focuses on promoting bone healing and may include surgical intervention, such as internal fixation with plates or screws, bone grafting, or external fixation. Non-surgical options like bracing or casting may be used if appropriate. Physical therapy is often recommended to restore strength and mobility. Pain management and monitoring for infection are also key components of care.

Prognosis and Follow-Up

Prognosis depends on the severity of the nonunion, overall health, and response to treatment. Healing may take longer than a typical fracture, and some cases require multiple interventions. Regular follow-up appointments with imaging are necessary to monitor progress. Long-term outcomes may include residual pain or limited function, but many patients achieve satisfactory recovery with appropriate care.

Complications

• Delayed or failed healing (nonunion).
• Infection, especially with open fractures.
• Nerve or blood vessel damage.
• Chronic pain or arthritis in the affected joint.
• Leg length discrepancy or deformity.
• Reduced mobility or functional impairment.

Lifestyle & Prevention

• Avoid high-impact activities until cleared by a healthcare provider.
• Follow prescribed weight-bearing restrictions.
• Maintain a balanced diet rich in calcium and vitamin D to support bone health.
• Quit smoking to improve healing potential.
• Use protective equipment during sports or activities with fall risks.
• Attend all follow-up appointments and adhere to treatment plans.

When to Seek Professional Help

Seek immediate medical attention if you experience:

• Severe or worsening pain.
• Increased swelling, redness, or drainage from the wound.
• Signs of infection (fever, chills).
• Numbness, tingling, or coldness in the foot or toes.
• Sudden inability to bear weight on the leg.
• New or worsening deformity.

Tips for Medical Coders

This code is used for a subsequent encounter for an open fracture type I or II of the right fibula shaft with nonunion. Document the fracture type (open, type I or II), the presence of nonunion, and the encounter type (subsequent) to support accurate coding. Ensure clinical documentation specifies the bone (right fibula), fracture pattern (transverse, displaced), and any complications (nonunion) to align with the code's requirements.