S92.356K Nondisplaced fracture of fifth metatarsal bone, unspecified foot, subsequent encounter for fracture with nonunion

Name of the Condition

• Technical Term: Nondisplaced fracture of fifth metatarsal bone, unspecified foot, subsequent encounter for fracture with nonunion
• ICD-10 Code: S92.356K
• Common Name: Broken fifth metatarsal (unspecified foot, nonunion, subsequent encounter)

Summary

A nondisplaced fracture of the fifth metatarsal bone in the unspecified foot is a break in the long bone on the outer edge of the foot where the bone fragments remain in their normal alignment. This code specifies a subsequent encounter for a fracture that has failed to heal (nonunion). Nonunion occurs when the bone does not properly fuse after an initial injury, requiring ongoing medical management. The condition typically results from trauma or repetitive stress and may necessitate additional interventions to promote healing.

Causes

Direct trauma to the foot, such as a fall, twist, or impact, is the most common cause. Repetitive stress from activities like running or jumping may also lead to stress fractures over time. Nonunion can develop if the initial fracture does not heal properly due to inadequate immobilization, poor blood supply, or underlying health conditions.

Risk Factors

• Participation in high-impact sports (e.g., basketball, soccer)
• Wearing improper or non-supportive footwear
• Conditions that weaken bones, such as osteoporosis
• Advanced age, which may reduce bone density and balance
• Previous foot injuries or fractures
• Smoking or poor nutrition, which can impair healing

Symptoms

• Persistent pain and tenderness on the outer edge of the foot
• Swelling or bruising in the affected area
• Difficulty bearing weight or walking
• Possible clicking or grinding sensation during movement
• No visible deformity, as the fracture remains nondisplaced

Diagnosis

Diagnosis involves a physical examination to assess pain, swelling, and mobility. Imaging studies, such as X-rays or CT scans, are used to confirm the fracture and evaluate for nonunion. Additional tests may be ordered to rule out underlying conditions that could affect healing. Documentation must specify the nonunion and subsequent encounter status to support the code.

Treatment Options

Treatment focuses on promoting bone healing and may include immobilization with a cast or boot, physical therapy to restore strength and mobility, and pain management. In some cases, surgical intervention, such as bone grafting or fixation, may be necessary to address nonunion. Follow-up imaging is typically performed to monitor progress.

Prognosis and Follow-Up

Prognosis depends on the severity of the nonunion and adherence to treatment. Most patients improve with proper care, but healing may take longer than for acute fractures. Regular follow-up appointments are essential to assess healing and adjust treatment as needed. Long-term monitoring may be required to prevent recurrence.

Complications

• Chronic pain or discomfort
• Persistent nonunion requiring further intervention
• Increased risk of re-fracture
• Limited mobility or activity restrictions
• Potential for arthritis in the affected joint over time

Lifestyle & Prevention

• Wear supportive, well-fitted footwear during activities
• Gradually increase physical activity to avoid overuse injuries
• Maintain a healthy diet rich in calcium and vitamin D to support bone health
• Avoid high-impact activities if you have a history of foot fractures
• Use proper techniques and protective gear during sports

When to Seek Professional Help

Seek medical attention if you experience persistent pain, swelling, or difficulty walking after a foot injury. Immediate care is needed if you notice a visible wound, increased pain, or signs of infection (e.g., redness, fever). Follow up with a healthcare provider if symptoms worsen or do not improve with initial treatment.

Tips for Medical Coders

Document the subsequent encounter for fracture with nonunion clearly, including clinical notes that specify the nonunion status and any treatments provided. Ensure the code S92.356K is used only when the fracture is nondisplaced, involves the fifth metatarsal of an unspecified foot, and is a subsequent encounter for nonunion. Avoid using this code for initial encounters or fractures without documented nonunion.