S82.456M Nondisplaced comminuted fracture of shaft of unspecified fibula, subsequent encounter for open fracture type I or II with nonunion

Name of the Condition

• Nondisplaced comminuted fracture of shaft of unspecified fibula, subsequent encounter for open fracture type I or II with nonunion
• ICD-10 Code: S82.456M

Summary

A nondisplaced comminuted fracture of the shaft of the unspecified fibula, subsequent encounter for open fracture type I or II with nonunion, is a break in the long, slender bone of the lower leg where the bone is shattered into multiple pieces but the fragments remain in their original alignment. The fracture is classified as open (type I or II), meaning the skin is broken, and this is a subsequent encounter for treatment. The condition includes nonunion, indicating the fracture has not healed properly after an initial period. This type of fracture involves the middle portion of the fibula and may vary in severity depending on the number of bone fragments, associated soft tissue damage, and the extent of nonunion.

Causes

This fracture is typically caused by direct trauma or high-impact force to the leg, such as from falls, motor vehicle accidents, or sports injuries. The open nature of the fracture indicates that the force was sufficient to break the skin, exposing the bone fragments. Twisting motions or repetitive stress can also lead to comminuted fractures in some cases, particularly when combined with sufficient force to cause an open wound. Nonunion may result from inadequate immobilization, poor blood supply to the fracture site, infection, or other factors that impede healing.

Risk Factors

• Participation in high-impact sports or activities
• Osteoporosis or conditions that weaken bone density
• Advanced age, which may reduce bone strength
• Previous leg injuries or surgeries
• Poor nutrition or smoking, which can impair bone healing
• Inadequate initial treatment or follow-up care

Symptoms

• Persistent pain and tenderness along the fibula
• Swelling and bruising around the lower leg
• Difficulty bearing weight on the affected leg
• Possible deformity or instability of the leg structure
• Open wound or scar from the initial fracture
• Signs of nonunion, such as lack of healing progress over time

Diagnosis

Diagnosis involves a physical examination to assess tenderness, swelling, and deformity. Imaging tests, such as X-rays, are typically used to confirm the fracture and determine the number of bone fragments, the presence of nonunion, and the type of open fracture. Additional tests, such as CT scans or MRI, may be used to evaluate soft tissue damage or assess blood supply to the fracture site. The history of the initial injury and previous treatment is also considered to determine the appropriate classification.

Treatment Options

Treatment focuses on promoting healing and addressing nonunion. This may include surgical intervention, such as bone grafting or internal fixation, to stabilize the fracture and encourage union. Antibiotics may be prescribed if infection is present. Immobilization with a cast or brace may be necessary to protect the fracture during healing. Physical therapy is often recommended to restore strength and mobility once healing progresses. In some cases, additional procedures may be required to address complications or improve outcomes.

Prognosis and Follow-Up

The prognosis depends on the severity of the fracture, the presence of nonunion, and the effectiveness of treatment. With appropriate care, many patients can achieve successful healing, but nonunion may require extended treatment or additional interventions. Follow-up appointments are essential to monitor healing progress, assess for complications, and adjust treatment as needed. Long-term outcomes may include residual pain, limited mobility, or the need for further surgery in severe cases.

Complications

• Nonunion or delayed healing
• Infection at the fracture site
• Nerve or blood vessel damage
• Chronic pain or instability
• Limited range of motion or mobility
• Need for additional surgical interventions

Lifestyle & Prevention

• Avoid high-impact activities that risk leg injury until fully healed.
• Maintain a healthy diet rich in calcium and vitamin D to support bone health.
• Quit smoking, as it impairs bone healing.
• Follow post-treatment instructions carefully, including immobilization and physical therapy.
• Use protective gear during sports or activities to reduce injury risk.

When to Seek Professional Help

Seek medical attention if you experience:

• Severe or worsening pain
• Increased swelling, redness, or drainage from the wound
• Signs of infection, such as fever or pus
• Difficulty bearing weight or using the leg
• New or worsening deformity
• Persistent symptoms without improvement over time

Tips for Medical Coders

When coding for S82.456M, ensure documentation supports:

• Nondisplaced comminuted fracture of the fibula shaft
• Open fracture type I or II (skin broken but minimal soft tissue damage)
• Subsequent encounter (follow-up care, not initial treatment)
• Nonunion (failure of the fracture to heal)
• Unspecified fibula (no specific laterality or side noted) Accurate documentation of the fracture type, encounter stage, and nonunion is critical for correct code assignment. Verify that the open fracture classification aligns with the clinical findings and that nonunion is explicitly documented or inferred from the medical record.