S92.352K Displaced fracture of fifth metatarsal bone, left foot, subsequent encounter for fracture with nonunion

Name of the Condition

• Technical Term: Displaced fracture of fifth metatarsal bone, left foot, subsequent encounter for fracture with nonunion
• ICD-10 Code: S92.352K
• Common Name: Broken fifth metatarsal (left foot, nonunion)

Summary

A displaced fracture of the fifth metatarsal bone in the left foot, with nonunion, occurs when the bone fragments fail to heal properly after an initial break. This condition is identified during a follow-up visit, indicating the fracture has not fused as expected. The fifth metatarsal is the long bone on the outer edge of the foot, and nonunion can lead to persistent pain, instability, or functional limitations.

Causes

Direct trauma to the left foot, such as a fall, twist, or impact, is the primary cause. Sports injuries, missteps, or accidents involving the foot are common triggers. Repetitive stress from activities like running or jumping may also lead to fractures over time. Nonunion may result from inadequate immobilization, poor blood supply to the bone, or underlying health conditions that impair healing.

Risk Factors

• Participation in high-impact sports (e.g., basketball, soccer)
• Wearing improper or non-supportive footwear
• Conditions that weaken bones, such as osteoporosis or diabetes
• Advanced age, which may reduce bone density and healing capacity
• Smoking or poor nutrition, which can hinder bone repair
• Previous foot injuries or fractures that did not heal correctly

Symptoms

• Persistent pain and tenderness on the outer edge of the left foot
• Swelling or bruising that does not resolve over time
• Difficulty bearing weight on the left foot
• Possible deformity or instability in the affected area
• Limited range of motion in the foot or ankle

Diagnosis

A healthcare provider will perform a physical examination to assess pain, swelling, and mobility. Imaging studies, such as X-rays or CT scans, are used to confirm nonunion by showing a persistent gap between bone fragments or lack of callus formation. Additional tests may evaluate blood flow or underlying conditions that could affect healing.

Treatment Options

Treatment depends on the severity of nonunion and may include:

• Immobilization: Casting or bracing to stabilize the foot and promote healing.
• Surgical intervention: Bone grafting, internal fixation (e.g., screws or plates), or bone stimulation to encourage union.
• Pain management: Medications to reduce discomfort during recovery.
• Physical therapy: Exercises to restore strength and mobility once healing progresses.

Prognosis and Follow-Up

Prognosis varies based on the extent of nonunion and treatment response. With appropriate intervention, many fractures eventually heal, but recovery may take longer than initial fractures. Regular follow-up visits and imaging are necessary to monitor progress. Long-term outcomes depend on adherence to treatment and addressing any underlying risk factors.

Complications

• Chronic pain or instability in the foot
• Increased risk of re-injury or additional fractures
• Difficulty with daily activities or sports participation
• Potential need for additional surgery if nonunion persists
• Development of arthritis in the surrounding joints

Lifestyle & Prevention

• Wear supportive, properly fitting footwear to reduce stress on the foot.
• Avoid high-impact activities until cleared by a healthcare provider.
• Maintain a balanced diet rich in calcium and vitamin D to support bone health.
• Quit smoking, as it impairs bone healing.
• Engage in low-impact exercises (e.g., swimming) to maintain fitness without stressing the foot.

When to Seek Professional Help

Seek care if you experience:

• Worsening pain, swelling, or bruising in the left foot
• Inability to bear weight on the foot
• New deformity or instability
• Signs of infection (e.g., redness, warmth, fever)
• Persistent symptoms after initial treatment

Tips for Medical Coders

Document the encounter as a subsequent visit for fracture with nonunion, specifying the left foot and fifth metatarsal. Include details on imaging results, treatment provided (e.g., immobilization, surgery), and any underlying conditions affecting healing. Ensure documentation supports the "nonunion" designation to justify the code.