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N13.6

Pyonephrosis

Billable FY2026 2025-10-01 → 2026-09-30
Exclusions 13 never code together
N13code
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
N10-N16block
Excludes1
  • pyeloureteritis cystica (N28.85)N28.85
N00-N99chapter
Excludes2
  • certain conditions originating in the perinatal period (P04-P96)P04-P96
  • certain infectious and parasitic diseases (A00-B99)A00-B99
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)O00-O9A
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)Q00-Q99
  • endocrine, nutritional and metabolic diseases (E00-E88)E00-E88
  • injury, poisoning and certain other consequences of external causes (S00-T88)S00-T88
  • neoplasms (C00-D49)C00-D49
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)R00-R94

Excludes1 — never code together. The excluded condition and this one are mutually exclusive.

Excludes2 — not included here, but the patient may have both. Code both when documented.

Instructional notes 4
N13.6code
Inclusion terms
Use additional code
N10-N16block
Includes
  • pyelonephritis
Index entries leading here 22
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) L02.91
  • Hydronephrosis (atrophic) (early) (functionless) (intermittent) (primary) (secondary) NEC N13.30
  • Angulation
  • Pyelonephritis — see also Nephritis, tubulo-interstitial
  • Pyelitis (congenital) (uremic) — see also Pyelonephritis
  • Calculus, calculi, calculous
    • ureter (impacted) (recurrent) N20.1
    • kidney (impacted) (multiple) (pelvis) (recurrent) (staghorn) N20.0
    • urinary (duct) (impacted) (passage) (tract) N20.9
    • pyelitis (impacted) (recurrent) N20.0
      • with hydronephrosis N13.6
    • pyelonephritis (impacted) (recurrent) N20
      • with hydronephrosis N13.6
  • Constriction — see also Stricture
  • Contraction (s) , contracture, contracted
    • ureterovesical orifice (postinfectional) N13.5
  • Fasciitis M72.9
    • perirenal (with ureteral obstruction) N13.5
  • Fibrosis, fibrotic
  • Stricture — see also Stenosis
    • ureter (postoperative) N13.5
    • ureterovesical orifice N13.5
  • Obstruction, obstructed, obstructive
    • ureter (functional) (pelvic junction) NEC N13.5
  • Kink, kinking
    • ureter (pelvic junction) N13.5
  • Hydropyonephrosis N13.6
  • Hydroureter N13.4
  • Infection, infected, infective (opportunistic) B99.9
    • kidney (cortex) (hematogenous) N15.9
  • Narrowing — see also Stenosis
  • Obliteration
  • Ormond's disease (with ureteral obstruction) N13.5
  • Prolapse, prolapsed
  • Pyohydronephrosis N13.6
  • Pyonephrosis N13.6
Alongside this code 9 same parent — N13
N13.0 Hydronephrosis with ureteropelvic junction obstruction N13.1 Hydronephrosis w ureteral stricture, NEC N13.2 Hydronephrosis with renal and ureteral calculous obstruction N13.3 Other and unspecified hydronephrosis category N13.4 Hydroureter N13.5 Crossing vessel and stricture of ureter w/o hydronephrosis N13.7 Vesicoureteral-reflux category N13.8 Other obstructive and reflux uropathy N13.9 Obstructive and reflux uropathy, unspecified
Additional references
AHA Coding Clinic® Licence required

Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.

Risk adjustment

Maps to no condition category in any loaded model.

Presence is a property of the code. Untick a model to hide it everywhere.

This code

Billable
yes
Code set
FY2026
Parent
N13
Block
N10-N16
Siblings
9

Present FY2024–FY2027.