N13.722 Vesicoureteral-reflux with reflux nephropathy without hydroureter, bilateral

Name of the Condition

• Vesicoureteral reflux with reflux nephropathy without hydroureter, bilateral (ICD-10-CM: N13.722)

Summary

Vesicoureteral reflux (VUR) with reflux nephropathy without hydroureter, bilateral, is a condition where urine flows backward from the bladder into both ureters and kidneys, causing kidney damage (reflux nephropathy) without associated ureteral swelling (hydroureter). This occurs due to a malfunction of the valve-like mechanism at the ureter-bladder junction, which fails to prevent backflow. The bilateral involvement indicates both sides of the urinary tract are affected, and the absence of hydroureter distinguishes this from other VUR presentations. VUR can lead to urinary tract infections (UTIs) and progressive kidney damage if untreated.

Causes

The primary cause is an abnormality in the ureter-bladder junction, where the valve fails to prevent backflow of urine. This can result from congenital defects, such as a short or poorly developed ureteral tunnel, or acquired factors like bladder outlet obstruction or neurogenic bladder. In bilateral cases, the defect may affect both ureters, often due to structural or functional abnormalities present at birth or developing later. Reflux nephropathy occurs when repeated backflow damages kidney tissue, while the absence of hydroureter suggests the ureters are not dilated despite the reflux.

Risk Factors

• Congenital urinary tract abnormalities
• Family history of vesicoureteral reflux
• Recurrent urinary tract infections
• Neurogenic bladder or bladder dysfunction
• Male gender (in infants and young children)
• Conditions causing increased bladder pressure (e.g., posterior urethral valves)

Symptoms

• Recurrent urinary tract infections (UTIs)
• Fever, especially in infants or young children
• Flank pain or abdominal discomfort
• Hematuria (blood in urine)
• Urinary urgency or frequency
• High blood pressure (hypertension) in advanced cases

Diagnosis

Diagnosis typically involves imaging studies to confirm reflux and assess kidney damage. Voiding cystourethrography (VCUG) or radionuclide cystography (RNC) evaluates urine flow and identifies reflux. Renal ultrasound or dimercaptosuccinic acid (DMSA) scans assess kidney structure and detect nephropathy. Urinalysis and urine culture may be used to check for infections. The absence of hydroureter is confirmed via imaging, and bilateral involvement is documented by observing reflux in both ureters.

Treatment Options

Treatment focuses on preventing infections and reducing reflux. Antibiotics may be prescribed to prevent UTIs, especially in children. Surgical options include ureteral reimplantation to correct the valve mechanism or endoscopic injections to improve ureter-bladder junction function. Monitoring kidney function through regular imaging and blood pressure checks is essential. In some cases, lifestyle modifications like adequate hydration and bladder training may be recommended.

Prognosis and Follow-Up

Prognosis depends on the severity of reflux nephropathy and response to treatment. Early intervention can prevent further kidney damage, but bilateral involvement may increase the risk of long-term complications. Regular follow-up with imaging (e.g., ultrasound, DMSA scans) and renal function tests is necessary to monitor kidney health. Children may outgrow mild reflux, but severe cases may require ongoing management into adulthood.

Complications

• Progressive kidney damage or scarring (reflux nephropathy)
• Chronic kidney disease or renal insufficiency
• Recurrent or severe urinary tract infections
• Hypertension (high blood pressure)
• Kidney failure in advanced cases

Lifestyle & Prevention

• Maintain good hydration to reduce infection risk.
• Practice proper hygiene to prevent UTIs.
• Follow prescribed antibiotic regimens as directed.
• Attend regular medical check-ups for monitoring.
• Address underlying conditions like bladder dysfunction promptly.

When to Seek Professional Help

Seek medical attention if experiencing recurrent UTIs, fever, flank pain, or blood in urine. Prompt evaluation is critical for children with suspected VUR to prevent kidney damage. Adults with a history of VUR should consult a healthcare provider for monitoring, especially if symptoms worsen or new issues like hypertension arise.

Tips for Medical Coders

Document the bilateral nature of the reflux and the absence of hydroureter clearly in the medical record, as these details are required for accurate coding. Ensure reflux nephropathy is explicitly stated, as this differentiates the condition from uncomplicated VUR. Use additional codes for associated conditions like UTIs or hypertension if present. Verify laterality and absence of hydroureter to avoid miscoding.