S52.235R Nondisplaced oblique fracture of shaft of left ulna, subsequent encounter for open fracture type IIIA, IIIB, or IIIC with malunion

Name of the Condition

• Nondisplaced oblique fracture of shaft of left ulna, subsequent encounter for open fracture type IIIA, IIIB, or IIIC with malunion

Summary

A nondisplaced oblique fracture of the shaft of the left ulna is a break in the long, straight portion of the left ulna bone (one of the two forearm bones) where the fracture line runs at an angle across the bone, and the bone fragments remain aligned. This type of fracture involves the main body of the ulna and is classified as an open fracture (type IIIA, IIIB, or IIIC), meaning there is a break in the skin with significant contamination or tissue loss. The term "subsequent encounter" indicates this is a follow-up visit for treatment of the injury, and "malunion" refers to the fracture healing in a misaligned 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 an angled break in the ulna shaft. Open fractures may result from the same mechanisms if the force also disrupts the skin. Malunion can occur if the fracture does not heal properly, often due to inadequate immobilization or severe initial injury.

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.
• Activities involving high-velocity impacts or penetrating trauma.
• Delayed or inadequate initial treatment of the fracture.

Symptoms

• Persistent 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.
• Visible deformity if the fracture has healed in a misaligned position (malunion).
• Possible signs of infection or delayed healing in open fractures.

Diagnosis

Physical examination to assess tenderness, swelling, and range of motion. Imaging tests, such as X-rays, to confirm the fracture type, alignment, and presence of malunion. Evaluation of the skin for open wounds or signs of infection. Assessment of functional limitations and previous treatment history to determine the encounter type.

Treatment Options

• Immobilization with a cast or splint to stabilize the fracture and promote healing.
• Surgical intervention, such as internal fixation, to correct malunion or stabilize the bone.
• Antibiotics for open fractures to prevent or treat infection.
• Physical therapy to restore strength and range of motion after healing.
• Pain management with medications or other modalities.

Prognosis and Follow-Up

Prognosis depends on the severity of the initial injury, the presence of malunion, and the effectiveness of treatment. Most fractures heal with proper care, but malunion may result in long-term functional limitations. Follow-up visits are necessary to monitor healing, assess alignment, and adjust treatment as needed. Regular imaging may be required to evaluate progress.

Complications

• Malunion or nonunion of the fracture.
• Infection, particularly in open fractures.
• Nerve or blood vessel damage.
• Chronic pain or stiffness.
• Reduced range of motion or strength in the forearm.

Lifestyle & Prevention

• Use protective gear during high-risk activities, such as sports or work.
• Maintain bone health through a balanced diet and regular exercise.
• Avoid falls by using assistive devices if needed, especially in older adults.
• Seek prompt treatment for fractures to reduce the risk of malunion.

When to Seek Professional Help

• Severe or worsening pain that is not relieved by rest or medication.
• Signs of infection, such as redness, warmth, or pus at the injury site.
• Numbness, tingling, or loss of circulation in the hand or fingers.
• Inability to move the arm or wrist after initial treatment.
• Concerns about fracture alignment or healing progress.

Tips for Medical Coders

Document the fracture type (oblique, nondisplaced), bone (left ulna shaft), encounter type (subsequent), and open fracture classification (IIIA, IIIB, or IIIC) with malunion. Ensure the record specifies the presence of malunion and the open fracture details to support the code. Include details about treatment provided and any complications to justify the encounter type.