S52.366K Nondisplaced segmental fracture of shaft of radius, unspecified arm, subsequent encounter for closed fracture with nonunion

Name of the Condition

Nondisplaced segmental fracture of shaft of radius, unspecified arm, subsequent encounter for closed fracture with nonunion
ICD-10 Code: S52.366K

Summary

A nondisplaced segmental fracture of the shaft of the radius is a break in the long, outer bone of the forearm (radius) between the elbow and wrist, where the bone is separated into two or more fragments without misalignment. This injury typically results from significant trauma and may impair arm function depending on the degree of soft tissue damage. The "unspecified arm" designation indicates the affected side is not documented. The "subsequent encounter for closed fracture with nonunion" modifier specifies this is a follow-up visit for a fracture that has not healed properly, with no open wound present.

Causes

This fracture commonly occurs due to direct trauma, such as falls onto an outstretched arm, high-impact blows to the forearm, or accidents involving twisting forces at the wrist or elbow. Motor vehicle collisions, sports injuries, or forceful impacts may also cause the bone to break into multiple segments. Nonunion may develop if the fracture fails to heal within the expected timeframe, often due to inadequate immobilization, poor blood supply, or infection.

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
• Smoking or poor nutrition, which can impair bone healing

Symptoms

• Persistent pain at the injury site, even after initial healing
• Swelling or bruising that does not resolve
• Limited range of motion in the wrist or forearm
• Possible deformity or instability of the arm
• No visible bone protrusion (closed fracture)

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 type and check for nonunion. The provider evaluates the fracture site for signs of delayed healing, such as a persistent gap between bone fragments or lack of callus formation. Additional tests may be ordered to rule out infection or other complications.

Treatment Options

Treatment focuses on promoting bone healing and restoring function. Options may include immobilization with a cast or brace, physical therapy to improve strength and mobility, or surgical intervention (e.g., bone grafting, internal fixation) if nonunion persists. Pain management and activity modification are also part of the care plan.

Prognosis and Follow-Up

Prognosis depends on the severity of the nonunion and the effectiveness of treatment. With appropriate care, many patients achieve full or partial recovery, though some may experience long-term stiffness or weakness. Follow-up visits are necessary to monitor healing progress and adjust treatment as needed.

Complications

• Chronic pain or discomfort
• Persistent nonunion requiring additional intervention
• Reduced range of motion or functional impairment
• Increased risk of future fractures in the affected area

Lifestyle & Prevention

• Avoid high-risk activities until fully healed
• Maintain a balanced diet rich in calcium and vitamin D to support bone health
• Use protective gear during sports or manual labor
• Quit smoking, as it impairs bone healing
• Follow post-treatment guidelines to reduce re-injury risk

When to Seek Professional Help

Seek medical attention if you experience worsening pain, swelling, or deformity, or if you notice no improvement in symptoms after initial treatment. Prompt evaluation is important for addressing nonunion and preventing further complications.

Tips for Medical Coders

Use S52.366K for subsequent encounters of a closed, nondisplaced segmental radius shaft fracture with nonunion. Document the affected arm (if known) and confirm the fracture is closed (no open wound) and nonunion is present. Ensure the encounter is classified as "subsequent" (not initial or acute) and that nonunion is clearly documented to support the code.