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

Name of the Condition

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

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 fracture that has failed to heal (nonunion) during the healing process. The condition typically affects the ankle joint and may result in instability due to the involvement of both bones. It often occurs from trauma that disrupts the structural integrity of the ankle.

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 shifting out of alignment. Twisting or rotational forces may also contribute to this type of injury. Nonunion may develop due to inadequate immobilization, poor blood supply to the fracture site, infection, or underlying health conditions that impair healing.

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.
• Factors that impair healing, including smoking, diabetes, or nutritional deficiencies.

Symptoms

• Persistent pain, swelling, or tenderness at the fracture site, even after initial healing attempts.
• Difficulty bearing weight or walking on the affected leg.
• Visible deformity or instability of the ankle joint.
• Limited range of motion in the ankle.
• Possible crepitus (grating sensation) with movement.

Diagnosis

Diagnosis involves a thorough clinical evaluation, including a review of the patient’s medical history and mechanism of injury. Physical examination assesses pain, swelling, and stability of the ankle. Imaging studies, such as X-rays, are used to confirm the fracture and assess for nonunion (e.g., visible gap at the fracture site or absence of healing progress over time). Additional tests, like CT scans or MRI, may be ordered to evaluate bone healing and rule out other complications.

Treatment Options

Treatment focuses on promoting fracture union and restoring function. Options may include:

• Prolonged immobilization with a cast or brace to stabilize the fracture.
• Surgical intervention, such as internal fixation with plates or screws, to realign and stabilize the bones.
• Bone grafting to stimulate healing in cases of severe nonunion.
• Physical therapy to improve strength, mobility, and functional recovery.
• Pain management and anti-inflammatory medications to alleviate symptoms.

Prognosis and Follow-Up

Prognosis depends on the severity of the nonunion, overall health, and response to treatment. With appropriate intervention, many patients achieve successful healing and restored ankle function. Follow-up care typically involves regular imaging to monitor healing progress and adjustments to treatment plans as needed. Long-term monitoring may be required to address potential complications, such as arthritis or chronic pain.

Complications

• Chronic pain or instability of the ankle joint.
• Development of post-traumatic arthritis due to joint damage.
• Infection, particularly if surgical intervention is required.
• Nerve or blood vessel damage in the affected area.
• Delayed or incomplete healing despite treatment.

Lifestyle & Prevention

• Avoid high-impact activities until cleared by a healthcare provider.
• Use protective footwear or braces during sports or activities with fall risks.
• Maintain a healthy diet rich in calcium and vitamin D to support bone health.
• Quit smoking, as it impairs bone healing.
• Follow post-treatment guidelines for immobilization and weight-bearing restrictions.

When to Seek Professional Help

Seek immediate medical attention if you experience:

• Sudden, severe pain or swelling in the ankle.
• Inability to bear weight on the affected leg.
• Visible deformity or instability of the ankle.
• Signs of infection, such as redness, warmth, or pus at the injury site.
• Worsening symptoms despite conservative treatment.

Tips for Medical Coders

Document the encounter as a subsequent visit for a closed fracture with nonunion. Ensure clinical documentation specifies the fracture type (nondisplaced bimalleolar), laterality (left), and the presence of nonunion. Include details about the treatment provided and any imaging results that confirm nonunion to support code assignment. Verify that the encounter aligns with the "subsequent encounter" phase of care for fractures with delayed healing.