|  N13 |  | Obstructive and reflux uropathy   | 
	
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		| 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 (Q62.11)
 obstructive pyelonephritis (N11.1)
 
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		|  N13.0 |  | Hydronephrosis with ureteropelvic junction obstruction |  
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| Hydronephrosis due to acquired occlusion of ureteropelvic junction |  
		| Excludes2 | Hydronephrosis with ureteropelvic junction obstruction due to calculus (N13.2) 
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		|  N13.1 |  | Hydronephrosis with ureteral stricture, not elsewhere classified |  
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		| Excludes1 | Hydronephrosis with ureteral stricture with infection (N13.6) 
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		|  N13.2 |  | Hydronephrosis with renal and ureteral calculous obstruction |  
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		| Excludes1 | Hydronephrosis with renal and ureteral calculous obstruction with infection (N13.6) 
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		|  N13.3 |  | Other and unspecified hydronephrosis |  
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		| Excludes1 | hydronephrosis with infection (N13.6) 
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		|  N13.30 |  | Unspecified hydronephrosis |  |  |  |  | 
	
		|  N13.39 |  | Other hydronephrosis |  |  | 
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		|  N13.4 |  | Hydroureter |  
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		| Excludes1 | congenital hydroureter (Q62.3-) hydroureter with infection (N13.6)
 vesicoureteral-reflux with hydroureter (N13.73-)
 
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		|  N13.5 |  | Crossing vessel and stricture of ureter without hydronephrosis |  
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| Kinking and stricture of ureter without hydronephrosis |  
		| Excludes1 | Crossing vessel and stricture of ureter without hydronephrosis with infection (N13.6) 
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		|  N13.6 |  | Pyonephrosis |  
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| Conditions in N13.0-N13.5 with infection |  | Obstructive uropathy with infection |  
		| UseAdditionalCode | code (B95-B97), to identify infectious agent. 
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		|  N13.7 |  | Vesicoureteral-reflux |  
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		| Excludes1 | reflux-associated pyelonephritis (N11.0) 
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		|  N13.70 |  | Vesicoureteral-reflux, unspecified |  
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| Vesicoureteral-reflux NOS |  |  |  |  |  | 
	
		|  N13.71 |  | Vesicoureteral-reflux without reflux nephropathy |  |  |  |  | 
	
		|  N13.72 |  | Vesicoureteral-reflux with reflux nephropathy without hydroureter |  |  |  | 
	
		|  N13.721 |  | Vesicoureteral-reflux with reflux nephropathy without hydroureter, unilateral |  |  |  |  | 
	
		|  N13.722 |  | Vesicoureteral-reflux with reflux nephropathy without hydroureter, bilateral |  |  |  |  | 
	
		|  N13.729 |  | Vesicoureteral-reflux with reflux nephropathy without hydroureter, unspecified |  |  |  |  |  | 
	
		|  N13.73 |  | Vesicoureteral-reflux with reflux nephropathy with hydroureter |  |  |  | 
	
		|  N13.731 |  | Vesicoureteral-reflux with reflux nephropathy with hydroureter, unilateral |  |  |  |  | 
	
		|  N13.732 |  | Vesicoureteral-reflux with reflux nephropathy with hydroureter, bilateral |  |  |  |  | 
	
		|  N13.739 |  | Vesicoureteral-reflux with reflux nephropathy with hydroureter, unspecified |  |  |  | 
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		|  N13.8 |  | Other obstructive and reflux uropathy |  
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| Urinary tract obstruction due to specified cause |  
		| CodeFirst | , if applicable, any causal condition, such as: enlarged prostate (N40.1)
 
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		|  N13.9 |  | Obstructive and reflux uropathy, unspecified |  
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| Urinary tract obstruction NOS |  |  |