S52.222K Displaced transverse fracture of shaft of left ulna, subsequent encounter for closed fracture with nonunion

Name of the Condition

• Displaced transverse fracture of shaft of left ulna, subsequent encounter for closed fracture with nonunion

Summary

A displaced transverse fracture of the shaft of the left ulna is a horizontal break across the long, central portion of the ulna bone in the forearm, with the bone fragments shifted out of alignment. This code applies to a subsequent encounter for a closed fracture (skin intact) that has failed to heal properly, resulting in nonunion. Nonunion indicates the fracture site has not united after an expected healing period, requiring ongoing management.

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. Factors contributing to nonunion may include inadequate immobilization, poor blood supply, infection, or underlying medical conditions affecting bone healing.

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.
• Smoking or poor nutrition, which impair bone healing.
• Certain medications (e.g., long-term corticosteroids) that affect bone metabolism.

Symptoms

• Persistent pain and tenderness localized to the forearm, often lasting beyond the typical healing period.
• Swelling and bruising around the injured area that may not resolve.
• Difficulty moving the arm, wrist, or hand due to pain or instability.
• Possible visible deformity if the fracture remains displaced.
• Lack of improvement in symptoms despite prior treatment.

Diagnosis

Physical examination to assess tenderness, swelling, and range of motion. Imaging tests, such as X-rays, to confirm the fracture and evaluate for nonunion (e.g., visible gap at the fracture site, absence of callus formation). Additional imaging (e.g., CT or MRI) may be used to assess bone healing or identify contributing factors. Review of prior treatment history and healing timeline.

Treatment Options

• Orthopedic evaluation to determine the best approach for promoting union.
• Possible surgical intervention, such as bone grafting, internal fixation, or external fixation, to stabilize the fracture and encourage healing.
• Immobilization with a cast or brace to support the bone during healing.
• Pain management and physical therapy to restore function and strength.
• Addressing underlying factors (e.g., nutrition, smoking cessation) that may impede healing.

Prognosis and Follow-Up

Prognosis depends on the severity of the nonunion, overall health, and response to treatment. Some fractures may heal with intervention, while others may require long-term management. Regular follow-up with imaging is typically needed to monitor progress. Physical therapy is often recommended to improve mobility and strength once healing is underway.

Complications

• Chronic pain or discomfort at the fracture site.
• Persistent instability or limited range of motion in the forearm.
• Infection (if surgical intervention is required).
• Need for additional surgeries if initial treatment is unsuccessful.
• Long-term functional impairment affecting daily activities.

Lifestyle & Prevention

• Avoid high-impact activities until cleared by a healthcare provider.
• Follow a balanced diet rich in calcium and vitamin D to support bone health.
• Quit smoking and limit alcohol, as these can impair healing.
• Use protective gear during sports or activities with fall risks.
• Maintain regular exercise to strengthen bones and muscles, as advised by a provider.

When to Seek Professional Help

Seek care if pain worsens, swelling increases, or new symptoms (e.g., numbness, tingling) develop. Contact a healthcare provider if the fracture does not show signs of healing after several months or if mobility continues to decline. Immediate attention is needed for signs of infection (e.g., redness, pus) or if the cast/brace becomes loose or damaged.

Tips for Medical Coders

This code is used for a subsequent encounter (not initial) for a closed fracture of the left ulna shaft with nonunion. Document the encounter type (subsequent), fracture status (closed), and confirmation of nonunion (e.g., imaging findings, clinical assessment). Ensure the left ulna and transverse fracture type are clearly documented. Nonunion must be explicitly stated or supported by evidence to justify this code.