S52.223Q Displaced transverse fracture of shaft of unspecified ulna, subsequent encounter for open fracture type I or II with malunion

Name of the Condition

• Displaced transverse fracture of shaft of unspecified ulna, subsequent encounter for open fracture type I or II with malunion

Summary

A displaced transverse fracture of the shaft of the unspecified ulna is a horizontal break across the long, central portion of the ulna bone (one of the two forearm bones) where the bone fragments are shifted out of alignment. This is a subsequent encounter for an open fracture type I or II with malunion, meaning the fracture has been previously treated, the skin over the fracture site was broken (type I) or there was a wound larger than 1 cm without extensive soft tissue damage (type II), and the bone has healed in a non-anatomical position.

Causes

Direct trauma to the forearm, such as from a fall, blow, or accident. High-impact injuries, including sports-related incidents or motor vehicle collisions. Indirect forces transmitted through the wrist or elbow, potentially causing a break in the ulna shaft.

Risk Factors

• Participation in contact sports or activities with a high risk of falls.
• Osteoporosis or other conditions that weaken bone density.
• Previous fractures or bone abnormalities that may predispose to injury.
• Advanced age, which can reduce bone strength.

Symptoms

• Pain and tenderness localized to the forearm.
• Swelling and bruising around the injured area.
• Difficulty moving the arm, wrist, or hand due to pain or instability.
• Possible visible deformity if the fracture is displaced.
• Altered function due to malunion, such as reduced range of motion or strength.

Diagnosis

Physical examination to assess tenderness, swelling, and deformity. Imaging studies, typically X-rays, to confirm the fracture type, displacement, and malunion. Review of prior treatment and fracture history to determine the encounter type and fracture classification.

Treatment Options

• Orthopedic evaluation to assess malunion and functional impact.
• Possible surgical intervention to realign and stabilize the bone if malunion causes significant impairment.
• Physical therapy to improve range of motion, strength, and function.
• Pain management with medications or other modalities.
• Monitoring for complications related to the open fracture or malunion.

Prognosis and Follow-Up

Prognosis depends on the severity of malunion, functional impairment, and response to treatment. Follow-up care may include regular imaging to assess healing and function, ongoing physical therapy, and monitoring for long-term complications. Most patients can expect improved function with appropriate management, though some residual limitations may persist.

Complications

• Chronic pain or discomfort.
• Reduced range of motion or strength in the forearm or hand.
• Nerve or vascular damage from the original injury or malunion.
• Infection risk from the prior open fracture.
• Delayed union or nonunion of the fracture.

Lifestyle & Prevention

• Use protective gear during high-risk activities.
• Maintain bone health through proper nutrition and exercise.
• Avoid falls by modifying the home environment (e.g., removing tripping hazards).
• Follow post-injury rehabilitation guidelines to optimize healing.

When to Seek Professional Help

Seek immediate medical attention for severe pain, swelling, or deformity. Consult a healthcare provider if symptoms worsen, or if there is new numbness, tingling, or difficulty moving the arm, wrist, or hand.

Tips for Medical Coders

Document the fracture type (open I or II), malunion status, and subsequent encounter details. Ensure the unspecified ulna side is clearly noted if not documented. Include details of prior treatment and current functional impact to support coding accuracy.