DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

N13 Obstructive and reflux uropathy

  • Header · not billable

N13 is not billable. The category heads 18 billable codes in FY2027, grouped under 10 subdivisions.

Index → code

Where it sits

  1. Chapter 14 Diseases of the genitourinary system (N00-N99)
  2. N10-N16 Renal tubulo-interstitial diseases (N10-N16)
  3. N13 Obstructive and reflux uropathy
Billable codes
18
Subdivisions
10
CC / MCC codes
8 / 0
HCC V28 codes
0
New FY2027
0
Index entries
111

Codes in N13

  1. N13.0
    Hydronephrosis with ureteropelvic junction obstruction
    BillableCC
    Inclusion terms 1, Excludes2 1

    Inclusion terms

    • Hydronephrosis due to acquired occlusion of ureteropelvic junction

    Excludes2

    • Hydronephrosis with ureteropelvic junction obstruction due to calculus (N13.2) N13.2
  2. N13.1
    Hydronephrosis with ureteral stricture, not elsewhere classified
    BillableCC
    Excludes1 1

    Excludes1

    • Hydronephrosis with ureteral stricture with infection (N13.6) N13.6
  3. N13.2
    Hydronephrosis with renal and ureteral calculous obstruction
    BillableCC
    Excludes1 1

    Excludes1

    • Hydronephrosis with renal and ureteral calculous obstruction with infection (N13.6) N13.6
  4. N13.3
    Other and unspecified hydronephrosis
    Header
    Excludes1 1

    Excludes1

    • hydronephrosis with infection (N13.6) N13.6
  5. N13.30
    Unspecified hydronephrosis
    BillableCC
  6. N13.39
    Other hydronephrosis
    BillableCC
  7. N13.4
    Hydroureter
    BillableCC
    Excludes1 3

    Excludes1

    • congenital hydroureter (Q62.3-) Q62.3
    • hydroureter with infection (N13.6) N13.6
    • vesicoureteral-reflux with hydroureter (N13.73-) N13.73
  8. N13.5
    Crossing vessel and stricture of ureter without hydronephrosis
    Billable
    Inclusion terms 1, Excludes1 1

    Inclusion terms

    • Kinking and stricture of ureter without hydronephrosis

    Excludes1

    • Crossing vessel and stricture of ureter without hydronephrosis with infection (N13.6) N13.6
  9. N13.6
    Pyonephrosis
    BillableCC
    Inclusion terms 2, Use additional code 1

    Inclusion terms

    • Conditions in N13.0-N13.5 with infection N13.0 N13.5
    • Obstructive uropathy with infection

    Use additional code

    • code (B95-B97), to identify infectious agent. B95 B97
  10. N13.7
    Vesicoureteral-reflux
    Header
    Excludes1 1

    Excludes1

    • reflux-associated pyelonephritis (N11.0) N11.0
  11. N13.70
    Vesicoureteral-reflux, unspecified
    Billable
    Inclusion terms 1

    Inclusion terms

    • Vesicoureteral-reflux NOS
  12. N13.71
    Vesicoureteral-reflux without reflux nephropathy
    Billable
  13. N13.72
    Vesicoureteral-reflux with reflux nephropathy without hydroureter
    Header
  14. N13.721
    Vesicoureteral-reflux with reflux nephropathy without hydroureter, unilateral
    Billable
  15. N13.722
    Vesicoureteral-reflux with reflux nephropathy without hydroureter, bilateral
    Billable
  16. N13.729
    Vesicoureteral-reflux with reflux nephropathy without hydroureter, unspecified
    Billable
  17. N13.73
    Vesicoureteral-reflux with reflux nephropathy with hydroureter
    Header
  18. N13.731
    Vesicoureteral-reflux with reflux nephropathy with hydroureter, unilateral
    Billable
  19. N13.732
    Vesicoureteral-reflux with reflux nephropathy with hydroureter, bilateral
    Billable
  20. N13.739
    Vesicoureteral-reflux with reflux nephropathy with hydroureter, unspecified
    Billable
  21. N13.8
    Other obstructive and reflux uropathy
    BillableCC
    Inclusion terms 1, Code first 2

    Inclusion terms

    • Urinary tract obstruction due to specified cause

    Code first

    • , if applicable, any causal condition, such as:
    • enlarged prostate (N40.1) N40.1
  22. N13.9
    Obstructive and reflux uropathy, unspecified
    Billable
    Inclusion terms 1

    Inclusion terms

    • Urinary tract obstruction NOS

CC/MCC: as a secondary diagnosis, unless the principal diagnosis is on the code’s PDX exclusion list (MS-DRG v44 Appendix C; list on the code card).

Sources of each column.

Instructions

At N13

Excludes2

  • calculus of kidney and ureter without hydronephrosis (N20.-) N20
  • congenital obstructive defects of renal pelvis and ureter (Q62.0-Q62.3) Q62.0 Q62.3
  • hydronephrosis with ureteropelvic junction obstruction (Q62.11) Q62.11
  • obstructive pyelonephritis (N11.1) N11.1

Notes that also apply

Block N10-N16 instructions (Includes 1, Excludes1 1): printed on the block page.

Chapter 14 instructions (Excludes2 8): printed on the chapter 14 page.

Index entries

  • Hydronephrosis (atrophic) (early) (functionless) (intermittent) (primary) (secondary) NEC → N13.30
  • Hydroureter → N13.4
  • Ormond's disease (with ureteral obstruction) → N13.5
  • Hydropyonephrosis → N13.6
  • Pyohydronephrosis → N13.6
  • Pyonephrosis → N13.6
  • Dietl's crisis → N13.8
  • Hydronephrosis (atrophic) (early) (functionless) (intermittent) (primary) (secondary) NECspecified type NEC → N13.39
  • Angulationureter → N13.5
  • Compressionureter → N13.5
  • Constrictionureter → N13.5
  • Contraction(s), contracture, contractedureterovesical orifice (postinfectional) → N13.5
  • Disease, diseasedOrmond's → N13.5
  • Fasciitisperirenal (with ureteral obstruction) → N13.5
  • Intussusception (bowel) (colon) (enteric) (ileocecal) (ileocolic) (intestine) ( rectum)ureter (with obstruction) → N13.5
  • Kink, kinkingureter (pelvic junction) → N13.5
  • Narrowingureter → N13.5
  • Obliterationureter → N13.5
  • Obstruction, obstructed, obstructivepelviureteral junction → N13.5
  • Obstruction, obstructed, obstructiveureter (functional) (pelvic junction) NEC → N13.5
  • Occlusion, occludedureter (complete) (partial) → N13.5
  • Occlusion, occludedureteropelvic junction → N13.5
  • Occlusion, occludedureterovesical orifice → N13.5
  • Spasm(s), spastic, spasticityureter → N13.5
  • Strictureureter (postoperative) → N13.5
  • Strictureureterovesical orifice → N13.5
  • SyndromeOrmond's → N13.5
  • Syndromeperiurethral fibrosis → N13.5
  • Hydroureterwith infection → N13.6
  • Ormond's disease (with ureteral obstruction)with infection → N13.6
  • Refluxvesicoureteral (with scarring) → N13.70
  • Anuriapostrenal → N13.8
  • CrisisDietl's → N13.8
  • Extravasationpelvicalyceal → N13.8
  • Extravasationpyelosinus → N13.8
  • Nephropathyobstructive → N13.8
  • Ovary, ovarianvein syndrome → N13.8
  • Tortuousureter → N13.8
  • Obstruction, obstructed, obstructiveurinary (moderate) → N13.9
  • Obstruction, obstructed, obstructiveuropathy → N13.9

71 more, longer entries are not listed; the search box finds them by word.

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy