S99.112K Salter-Harris Type I physeal fracture of left metatarsal, subsequent encounter for fracture with nonunion

Name of the Condition

• Salter-Harris Type I physeal fracture of left metatarsal, subsequent encounter for fracture with nonunion

Summary

This condition involves a Salter-Harris Type I fracture affecting the growth plate (physis) of the left metatarsal bone, occurring during a subsequent encounter for fracture care with evidence of nonunion. Type I fractures are defined by a complete separation of the growth plate without involvement of the metaphysis or epiphysis. Nonunion indicates that the fracture has failed to heal properly after an expected period. These injuries typically occur in children or adolescents, where the growth plate is still active, and require careful assessment to address healing delays and prevent long-term complications.

Causes

Direct trauma or injury to the left foot, such as falls, sports-related impacts, or accidents, can disrupt the growth plate. Sudden force applied to the metatarsals, including twisting or direct blows, may lead to this type of fracture. The injury often results from high-energy events that stress the developing bone structure, and nonunion may arise from inadequate immobilization, poor blood supply, or excessive movement during healing.

Risk Factors

• Age: Children and adolescents, as their growth plates are still developing and more susceptible to injury.
• High-impact activities: Participation in sports like running, jumping, or contact sports.
• Previous injuries: Prior damage to the metatarsals or surrounding structures may increase vulnerability.
• Inadequate treatment: Poor immobilization or non-compliance with post-injury care.

Symptoms

• Persistent pain and swelling localized to the left metatarsal area.
• Difficulty bearing weight or walking on the affected foot.
• Limited range of motion in the toes or midfoot.
• Visible deformity or instability in the foot.
• Delayed healing or lack of improvement over time.

Diagnosis

Diagnosis is based on clinical evaluation and imaging studies. A physical examination assesses pain, swelling, and functional limitations. Imaging, such as X-rays or MRI, confirms the fracture type and evaluates for nonunion. Additional tests may include CT scans to assess bone healing or blood flow studies if vascular compromise is suspected.

Treatment Options

Treatment focuses on promoting healing and addressing nonunion. Options may include prolonged immobilization with casting or bracing, surgical intervention (e.g., bone grafting or fixation), or physical therapy to restore function. Pain management and activity modification are also key components of care.

Prognosis and Follow-Up

Prognosis depends on the severity of nonunion and response to treatment. With appropriate intervention, many patients achieve healing, but delays or complications may affect long-term mobility. Regular follow-up with imaging and clinical assessments is necessary to monitor progress and adjust treatment as needed.

Complications

• Chronic pain or instability in the foot.
• Deformity or growth disturbances due to impaired healing.
• Increased risk of future fractures.
• Long-term functional limitations affecting gait or activity.

Lifestyle & Prevention

• Avoid high-impact activities until cleared by a healthcare provider.
• Use proper footwear and protective gear during sports.
• Maintain a healthy diet rich in calcium and vitamin D to support bone health.
• Follow post-injury care instructions closely to promote healing.

When to Seek Professional Help

Seek immediate medical attention if pain worsens, swelling increases, or mobility declines. Contact a healthcare provider if symptoms persist beyond expected healing timelines or if new deformities or instability develop.

Tips for Medical Coders

This code is used for a subsequent encounter for a Salter-Harris Type I physeal fracture of the left metatarsal with nonunion. Documentation should specify the fracture type, location, laterality, and the presence of nonunion. Ensure the encounter is classified as "subsequent" and that the nonunion is clearly documented to support code assignment.