S92.333P Displaced fracture of third metatarsal bone, unspecified foot, subsequent encounter for fracture with malunion

Name of the Condition

• Displaced fracture of third metatarsal bone, unspecified foot, subsequent encounter for fracture with malunion.

Summary

A displaced fracture of the third metatarsal bone in the unspecified foot is a break in the long bone connecting the ankle to the toes, where the bone fragments have shifted out of their normal alignment. This is a subsequent encounter for a fracture that has healed with malunion, meaning the bone has healed in a non-anatomic position. Malunion may result in altered foot mechanics, pain, or functional limitations, requiring evaluation to determine appropriate management.

Causes

Direct trauma to the foot, such as a fall, sports injury, or crush injury, is the primary cause of the initial fracture. Malunion occurs when the bone heals in a misaligned position, often due to inadequate initial stabilization, poor blood supply, or excessive movement during the healing process. Underlying bone weakness or repetitive stress may also contribute to fracture risk and malunion.

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
• Inadequate initial fracture management or non-compliance with immobilization

Symptoms

• Persistent pain, swelling, or tenderness in the midfoot region
• Difficulty bearing weight or walking on the affected foot
• Altered gait or foot mechanics
• Visible or palpable deformity at the fracture site
• Stiffness or reduced range of motion in the foot or toes

Diagnosis

A healthcare provider will perform a physical examination to assess pain, swelling, and range of motion, focusing on malunion signs like deformity or abnormal bone alignment. Imaging tests, such as X-rays or CT scans, are typically used to confirm malunion by visualizing the healed fracture position and assessing functional impact. Clinical correlation with the patient’s history of the initial injury and healing process is essential.

Treatment Options

Treatment depends on the severity of malunion and functional impairment. Conservative options include pain management, physical therapy to improve mobility and strength, and orthotic devices or footwear modifications to support alignment. Surgical intervention may be considered for significant deformity, persistent pain, or functional limitations, involving osteotomy (bone realignment) or hardware placement. Rehabilitation is critical to restore function post-treatment.

Prognosis and Follow-Up

Prognosis varies based on malunion severity and treatment response. Many patients experience improved function with conservative or surgical management, though some may have residual pain or altered gait. Regular follow-up with imaging and clinical assessments helps monitor healing and adjust treatment. Long-term outcomes depend on adherence to rehabilitation and addressing underlying risk factors.

Complications

• Chronic pain or discomfort
• Altered foot mechanics leading to gait abnormalities
• Increased risk of adjacent joint arthritis
• Reduced mobility or activity limitations
• Potential need for additional surgery if malunion worsens

Lifestyle & Prevention

• Wear supportive, properly fitted footwear to reduce stress on the foot.
• Avoid high-impact activities that strain the metatarsals until cleared by a provider.
• Maintain bone health through adequate nutrition (e.g., calcium, vitamin D) and exercise.
• Follow post-fracture care instructions to minimize malunion risk.
• Use protective gear during sports or activities with fall risks.

When to Seek Professional Help

Seek care if you experience worsening pain, new deformity, difficulty walking, or signs of infection (e.g., redness, warmth, drainage) at the fracture site. Persistent symptoms or functional limitations after initial treatment also warrant evaluation to address malunion or complications.

Tips for Medical Coders

Document the subsequent encounter for fracture with malunion, including clinical details of malunion (e.g., imaging findings, functional impact) and any treatment provided. Ensure the code aligns with the patient’s history of the initial fracture and current clinical status. Note the unspecified foot designation and avoid assuming laterality unless documented.