S82.846A Nondisplaced bimalleolar fracture of unspecified lower leg, initial encounter for closed fracture

Name of the Condition

• Nondisplaced bimalleolar fracture of unspecified lower leg, initial encounter for closed fracture
• ICD-10 Code: S82.846A

Summary

A nondisplaced bimalleolar fracture of the unspecified lower leg involves a break in both the medial (inner) and lateral (outer) malleoli at the distal end of the tibia and fibula, without displacement of bone fragments. This injury affects the ankle joint and may cause instability due to the involvement of both bones. It typically results from trauma and is classified as a closed fracture (no open wound) during the initial encounter.

Causes

Nondisplaced bimalleolar fractures commonly result from high-impact trauma, such as falls, motor vehicle accidents, or sports-related injuries. Direct force to the ankle, particularly when the foot is fixed, can cause both malleoli to fracture without shifting bone fragments. Twisting or rotational forces may also contribute to this type of injury.

Risk Factors

• Participation in activities with a high risk of ankle trauma, such as contact sports or skiing.
• Advanced age, which may lead to decreased bone density and increased fracture susceptibility.
• Conditions that weaken bone structure, such as osteoporosis or metabolic disorders.
• Previous ankle injuries or surgeries that compromise joint stability.

Symptoms

• Severe pain, swelling, and bruising around the ankle.
• Inability to bear weight on the affected leg.
• Tenderness and instability when attempting movement.
• Possible audible snap or pop at the time of injury.

Diagnosis

Diagnosis begins with a physical examination to assess pain, swelling, and deformity. Imaging, such as X-rays, confirms the fracture and confirms no displacement. CT or MRI may be used for detailed visualization of complex injuries or associated soft tissue damage.

Treatment Options

Treatment typically involves immobilization with a cast or brace to allow healing. Non-weight-bearing status may be recommended initially. Pain management and physical therapy are often part of the recovery process. Surgical intervention is less common for nondisplaced fractures but may be considered if instability persists.

Prognosis and Follow-Up

Prognosis is generally favorable with proper immobilization and adherence to treatment. Follow-up appointments monitor healing and may include repeat imaging. Most patients regain full function, though recovery time varies based on individual factors.

Complications

• Delayed healing or nonunion of the fracture.
• Post-traumatic arthritis due to joint damage.
• Chronic ankle instability or pain.
• Nerve or vascular injury in severe cases.

Lifestyle & Prevention

• Wear appropriate footwear for activities to reduce fall risk.
• Maintain bone health through diet and exercise.
• Use protective gear during high-risk sports.
• Avoid uneven surfaces that increase ankle twisting.

When to Seek Professional Help

Seek immediate medical attention if severe pain, swelling, or deformity occurs after an injury. Persistent pain, inability to bear weight, or signs of infection (e.g., redness, fever) warrant prompt evaluation.

Tips for Medical Coders

Document the nondisplaced nature of the fracture, the involvement of both malleoli, and the closed fracture status. Specify "unspecified" for the lower leg if the side is not documented. Include details of the initial encounter to support the code. Ensure trauma cause and absence of displacement are clearly recorded.