N11.1
Chronic obstructive pyelonephritis
Coding guidance (WHO 2019)
Pyelonephritis (chronic) associated with: anomaly of pelviureteric junction anomaly of pyeloureteric junction anomaly of ureter kinking of pelviureteric junction kinking of pyeloureteric junction kinking of ureter obstruction of pelviureteric junction obstruction of pyeloureteric junction obstruction of ureter stricture of pelviureteric junction stricture of pyeloureteric junction stricture of ureter Excl.: calculous pyelonephritis (N20.9) obstructive uropathy (N13.-)