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 interstitial nephritis NOS
 * Chronic pyelitis NOS
 * Chronic pyelonephritis NOS

N12 Tubulo-interstitial nephritis, not specified as acute or chronic

 * Includes: interstitial nephritis NOS
 * pyelitis NOS
 * pyelonephritis NOS
 * Excludes1: calculous pyelonephritis (N20.9)

N13 Obstructive and reflux uropathy

 * Excludes2: calculus of kidney and ureter without hydronephrosis (N20.-)
 * congenital obstructive defects of renal pelvis and ureter (Q62.0-Q62.3)
 * hydronephrosis with ureteropelvic junction obstruction (Q62.1)
 * obstructive pyelonephritis (N11.1)
 * N13.1 Hydronephrosis with ureteral stricture, not elsewhere classified
 * Excludes1: Hydronephrosis with ureteral stricture with infection (N13.6)
 * N13.2 Hydronephrosis with renal and ureteral calculous obstruction
 * Excludes1: Hydronephrosis with renal and ureteral calculous obstruction with infection (N13.6)
 * N13.3 Other and unspecified hydronephrosis
 * Excludes1: hydronephrosis with infection (N13.6)
 * N13.30 Unspecified hydronephrosis
 * N13.39 Other hydronephrosis
 * N13.4 Hydroureter
 * Excludes1: congenital hydroureter (Q62.3)
 * hydroureter with infection (N13.6)
 * vesicoureteral-reflux with hydroureter (N13.73-)
 * N13.5 Crossing vessel and stricture of ureter without hydronephrosis
 * Kinking and stricture of ureter without hydronephrosis
 * Excludes1: Crossing vessel and stricture of ureter without hydronephrosis with infection (N13.6)
 * N13.6 Pyonephrosis
 * Conditions in N13.0-N13.5 with infection
 * Obstructive uropathy with infection
 * Use additional code (B95-B97), to identify infectious agent.
 * N13.7 Vesicoureteral-reflux
 * Excludes1: reflux-associated pyelonephritis (N11.0)
 * N13.70 Vesicoureteral-reflux, unspecified
 * Vesicoureteral-reflux NOS
 * N13.71 Vesicoureteral-reflux without reflux nephropathy
 * N13.72 Vesicoureteral-reflux with reflux nephropathy without hydroureter
 * N13.