S82.845P Nondisplaced bimalleolar fracture of left lower leg, subsequent encounter for closed fracture with malunion

Name of the Condition

• Nondisplaced bimalleolar fracture of left lower leg, subsequent encounter for closed fracture with malunion
• ICD-10 Code: S82.845P

Summary

A nondisplaced bimalleolar fracture of the left lower leg involves a break in both the medial (inner) and lateral (outer) malleoli, the bony prominences at the distal end of the tibia and fibula. The fracture fragments remain in their normal alignment, and the injury is classified as closed (no open wound). This encounter is for a malunion, meaning the fracture has healed in a non-anatomical position, which may affect joint function or stability. The condition typically results from prior trauma and requires ongoing management to address healing outcomes.

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 in a fixed position, can cause both malleoli to fracture without displacement. Twisting or rotational forces may also contribute to this type of injury. Malunion may occur if the fracture heals improperly, often due to inadequate immobilization, poor blood supply, or insufficient follow-up care.

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.
• Inadequate immobilization or non-compliance with post-injury care instructions.

Symptoms

• Persistent pain, swelling, or tenderness at the ankle joint.
• Limited range of motion or stiffness in the affected leg.
• Visible deformity or misalignment of the ankle.
• Difficulty bearing weight or walking.
• Numbness or tingling in the foot or toes (if nerve involvement occurs).

Diagnosis

Diagnosis involves a thorough clinical evaluation, including a physical examination to assess pain, swelling, and joint stability. Imaging studies, such as X-rays, are used to confirm the fracture and evaluate healing alignment. CT or MRI scans may be ordered to assess malunion severity or associated soft tissue damage. The healthcare provider will also review the patient’s medical history and prior treatment to determine the cause of malunion.

Treatment Options

Treatment focuses on managing symptoms and addressing malunion. Options may include:

• Pain management with medications or physical therapy.
• Bracing or orthotics to support the ankle and improve stability.
• Surgical intervention, such as osteotomy or realignment, if malunion significantly impacts function.
• Rehabilitation to restore strength and mobility.
• Monitoring for complications, such as arthritis or chronic pain.

Prognosis and Follow-Up

Prognosis depends on the severity of malunion and the effectiveness of treatment. Many patients experience improved function with conservative or surgical management, but some may have long-term limitations. Regular follow-up appointments are necessary to monitor healing, assess joint function, and adjust treatment plans. Physical therapy is often recommended to optimize recovery and prevent future injuries.

Complications

• Chronic pain or arthritis in the ankle joint.
• Reduced mobility or gait abnormalities.
• Nerve damage or vascular impairment.
• Increased risk of future fractures due to weakened bone structure.
• Psychological impact, such as anxiety or depression, related to chronic pain or disability.

Lifestyle & Prevention

• Avoid high-impact activities that strain the ankle until fully healed.
• Use proper footwear and orthotics to support the ankle.
• Maintain a healthy diet rich in calcium and vitamin D to support bone health.
• Engage in low-impact exercises, such as swimming or cycling, to preserve mobility.
• Follow post-injury care instructions carefully to minimize malunion risk.

When to Seek Professional Help

Seek immediate medical attention if you experience:

• Severe or worsening pain, swelling, or deformity.
• Inability to bear weight on the affected leg.
• Numbness, tingling, or coldness in the foot or toes.
• Signs of infection, such as redness, warmth, or drainage.
• Sudden changes in mobility or function.

Tips for Medical Coders

Document the encounter as a subsequent visit for a closed fracture with malunion. Ensure the record specifies the fracture type (nondisplaced bimalleolar), location (left lower leg), and the presence of malunion. Include details on treatment provided, such as bracing, therapy, or surgical intervention, to support code assignment. Verify that the encounter aligns with the definition of "subsequent" (follow-up care after initial treatment) and that the fracture remains closed (no open wound).