Nonobstructive reflux-associated chronic pyelonephritis

This code signifies a persistent kidney infection (pyelonephritis) that is not caused by a physical blockage in the urinary tract but is instead linked to the backward flow of urine from the bladder into the ureters and kidneys. This reflux leads to chronic inflammation and potential scarring of the renal tissue.

Apply this code when documentation explicitly states chronic pyelonephritis with an identified association to nonobstructive reflux. This diagnosis is typically supported by imaging studies (e.g., voiding cystourethrogram, renal ultrasound) demonstrating reflux without evidence of anatomical obstruction, in conjunction with clinical signs and symptoms of chronic kidney infection.

• Differentiate from acute pyelonephritis; this code is specifically for chronic cases.
• Ensure documentation specifies "nonobstructive" and "reflux-associated" to accurately assign this code.
• Remember the Excludes1 note: do not code with N13.70 (vesicoureteral reflux NOS) as N11.0 already implies the reflux component.