S92.31 Fracture of first metatarsal bone

Name of the Condition

• Fracture of first metatarsal bone
• ICD-10 Code: S92.31

Summary

A fracture of the first metatarsal bone is a break in the long bone at the base of the big toe. This type of injury typically results from trauma, such as a direct impact or twisting force, and can vary in severity depending on the extent of the break. The first metatarsal is the largest and most weight-bearing of the metatarsal bones, making it susceptible to injury during activities that stress the foot.

Causes

Direct trauma to the foot, such as dropping a heavy object, a sports injury, or a fall, is the most common cause. Repetitive stress from activities like running or jumping can also lead to stress fractures over time. Twisting the foot or sudden impact may result in a fracture, particularly in high-impact scenarios.

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

Symptoms

• Pain and tenderness at the base of the big toe
• Swelling and bruising around the affected area
• Difficulty bearing weight or walking on the injured foot
• Possible deformity if the fracture is displaced

Diagnosis

A healthcare provider will perform a physical examination to assess pain, swelling, and range of motion. Imaging tests, such as X-rays, are typically used to confirm the fracture and determine its severity. Additional imaging, like an MRI or CT scan, may be ordered if a more detailed view is needed.

Treatment Options

• Immobilization with a cast or splint to allow healing
• Pain management through over-the-counter or prescription medications
• Physical therapy to restore strength and mobility
• Surgical intervention for severe or displaced fractures, which may involve realignment or fixation

Prognosis and Follow-Up

Most fractures of the first metatarsal heal well with proper treatment, though recovery time varies based on severity. Follow-up appointments are typically scheduled to monitor healing and adjust treatment as needed. Full weight-bearing may be delayed until the bone is sufficiently healed, and physical therapy may be recommended to regain function.

Complications

• Nonunion or delayed healing of the fracture
• Malunion, where the bone heals in an improper position
• Chronic pain or arthritis in the affected joint
• Nerve or tissue damage from the injury or treatment

Lifestyle & Prevention

• Wear supportive, well-fitting footwear during activities
• Use protective gear, such as toe guards, in high-risk sports
• Maintain bone health through a balanced diet and regular exercise
• Avoid sudden, forceful movements that could twist or impact the foot

When to Seek Professional Help

Seek immediate medical attention if you experience severe pain, swelling, or deformity after an injury, or if you cannot bear weight on the foot. Persistent pain, numbness, or signs of infection (e.g., redness, fever) also warrant prompt evaluation.

Tips for Medical Coders

When coding for a fracture of the first metatarsal bone (S92.31), ensure documentation specifies the bone involved (first metatarsal) and the nature of the fracture (e.g., displaced, nondisplaced, open, closed). Include details about the encounter (initial, subsequent, or sequela) and any associated complications to support accurate coding. Verify that the fracture is not further specified as displaced or open, as those would require different codes.