S52.326R Nondisplaced transverse fracture of shaft of unspecified radius, subsequent encounter for open fracture type IIIA, IIIB, or IIIC with malunion

Name of the Condition

Nondisplaced transverse fracture of shaft of unspecified radius, subsequent encounter for open fracture type IIIA, IIIB, or IIIC with malunion

Summary

A nondisplaced transverse fracture of the shaft of the unspecified radius is a break in the long, outer bone of the forearm (radius) that occurs horizontally across the bone's shaft, with the bone fragments remaining in their normal alignment. This injury is classified as an open fracture type IIIA, IIIB, or IIIC, indicating significant soft tissue damage, and is documented as a subsequent encounter with malunion, meaning the fracture has healed in a non-anatomic position. The fracture typically results from trauma and may affect arm function depending on the extent of soft tissue injury and malalignment.

Causes

This fracture commonly occurs due to direct trauma, such as falls onto an outstretched arm, direct blows to the forearm, or accidents involving twisting forces at the wrist or elbow. High-impact events like motor vehicle collisions or sports injuries can also cause the bone to break in a transverse pattern. Open fractures with severe soft tissue involvement often result from higher-energy trauma, such as crush injuries or penetrating wounds.

Risk Factors

• Participation in contact sports or activities with a high risk of falls
• Osteoporosis or weakened bone density
• Advanced age, which increases fracture susceptibility
• Previous forearm or wrist injuries
• Occupations or hobbies involving repetitive stress or heavy lifting

Symptoms

• Sudden, severe pain at the fracture site
• Swelling, bruising, or tenderness around the forearm
• Difficulty moving the arm or wrist
• Visible wound or open area if the fracture is open
• Possible deformity or malalignment due to malunion

Diagnosis

Diagnosis is confirmed through clinical evaluation and imaging studies. A physical examination assesses pain, swelling, and functional limitations. X-rays or CT scans visualize the fracture pattern, confirm displacement status, and identify malunion. The open fracture type (IIIA, IIIB, or IIIC) is determined by the extent of soft tissue damage, contamination, and vascular or nerve involvement. Documentation of the subsequent encounter and malunion is critical for accurate coding.

Treatment Options

Treatment focuses on managing the open fracture and addressing malunion. Initial care includes wound debridement, irrigation, and stabilization with casting or external fixation. Antibiotics may be prescribed to prevent infection. For malunion, surgical intervention such as osteotomy (bone realignment) or internal fixation may be necessary to restore function. Rehabilitation with physical therapy helps improve mobility and strength.

Prognosis and Follow-Up

Prognosis depends on the severity of the open fracture and the degree of malunion. Complications like infection, nonunion, or persistent functional impairment may occur. Regular follow-up with imaging and clinical assessments monitors healing and guides further treatment. Long-term outcomes vary, with some patients experiencing residual pain or limited range of motion.

Complications

• Infection at the fracture site or wound
• Nonunion or delayed healing
• Persistent pain or functional limitations
• Nerve or vascular damage from the initial trauma
• Stiffness or reduced mobility in the forearm or wrist

Lifestyle & Prevention

• Use protective gear during high-risk activities (e.g., sports, construction)
• Maintain bone health with adequate calcium and vitamin D intake
• Avoid falls by modifying home environments (e.g., removing tripping hazards)
• Engage in strength training to support bone density and muscle stability

When to Seek Professional Help

Seek immediate medical attention if you experience severe pain, swelling, or an open wound after trauma. Contact a healthcare provider if you notice worsening pain, signs of infection (e.g., redness, pus), or difficulty moving the arm. Follow up with your provider if symptoms persist or new issues arise during recovery.

Tips for Medical Coders

Document the fracture type (open IIIA, IIIB, or IIIC), subsequent encounter status, and malunion clearly. Ensure the unspecified radius is noted, as the code specifies the shaft but not the side. Verify that the encounter is classified as subsequent (not initial or sequela) and that malunion is explicitly documented to support the code.