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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-)
- Excludes1: congenital hydroureter (Q62.3)
- 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.
