N13.71 Vesicoureteral-reflux without reflux nephropathy

Name of the Condition

• Vesicoureteral reflux without reflux nephropathy (ICD-10: N13.71)

Summary

Vesicoureteral reflux (VUR) without reflux nephropathy is a condition where urine flows backward from the bladder into the ureters and kidneys, but without associated kidney damage. This reflux occurs due to a malfunction of the valve between the ureter and bladder, which normally prevents backflow. The condition can affect one or both kidneys and may be present at birth or develop later.

Causes

The primary cause is a defective ureterovesical junction, where the valve-like mechanism fails to prevent urine from flowing backward into the ureters. This can result from congenital abnormalities in the ureteral structure or bladder function. In some cases, VUR may be secondary to bladder outlet obstruction or neurogenic bladder, which increases pressure and disrupts normal urinary flow.

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
• Abdominal or flank pain
• Hematuria (blood in urine)
• Urinary urgency or frequency
• Incontinence (in severe cases)
• Failure to thrive (in infants)

Diagnosis

Diagnosis typically involves imaging tests such as voiding cystourethrogram (VCUG) or renal ultrasound to visualize reflux and assess kidney structure. Urinalysis and urine culture may detect infection. In some cases, nuclear medicine scans (e.g., dimercaptosuccinic acid [DMSA] scan) are used to evaluate kidney function and rule out nephropathy.

Treatment Options

• Antibiotic prophylaxis to prevent recurrent UTIs
• Monitoring with periodic imaging to assess reflux severity
• Surgical intervention (e.g., ureteral reimplantation) for persistent or severe reflux
• Management of underlying conditions (e.g., bladder dysfunction)

Prognosis and Follow-Up

Prognosis is generally favorable when VUR is managed appropriately, especially in children. Most cases resolve spontaneously as the child grows. Regular follow-up with imaging and urine tests is recommended to monitor for complications. Long-term outcomes depend on the severity of reflux and adherence to treatment.

Complications

• Recurrent or severe urinary tract infections
• Progression to reflux nephropathy (if untreated)
• Kidney scarring (in advanced cases)
• Hypertension or chronic kidney disease (rare)

Lifestyle & Prevention

• Maintain good hydration to support urinary tract health
• Practice proper hygiene to reduce infection risk
• Treat UTIs promptly to prevent recurrence
• Follow up with healthcare providers as recommended for monitoring

When to Seek Professional Help

Seek medical attention if symptoms of a UTI occur (e.g., fever, pain, frequent urination) or if there are signs of kidney involvement (e.g., swelling, reduced urine output). Prompt evaluation is important for children with recurrent infections or unexplained fever.

Tips for Medical Coders

Document the absence of reflux nephropathy clearly in the medical record, as this distinguishes N13.71 from codes involving kidney damage. Ensure the diagnosis is supported by imaging or clinical findings that confirm VUR without associated renal scarring or dysfunction. Code assignment should reflect the specific absence of nephropathy to align with documentation.