2020 ICD-10-CM Diagnosis Code N11.1

Chronic obstructive pyelonephritis

    2016 2017 2018 2019 2020 Billable/Specific Code
  • N11.1 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2020 edition of ICD-10-CM N11.1 became effective on October 1, 2019.
  • This is the American ICD-10-CM version of N11.1 - other international versions of ICD-10 N11.1 may differ.
Applicable To
  • Pyelonephritis (chronic) associated with anomaly of pelviureteric junction
  • Pyelonephritis (chronic) associated with anomaly of pyeloureteric junction
  • Pyelonephritis (chronic) associated with crossing of vessel
  • Pyelonephritis (chronic) associated with kinking of ureter
  • Pyelonephritis (chronic) associated with obstruction of ureter
  • Pyelonephritis (chronic) associated with stricture of pelviureteric junction
  • Pyelonephritis (chronic) associated with stricture of ureter
Type 1 Excludes
Type 1 Excludes Help
A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as N11.1. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
  • calculous pyelonephritis (
    ICD-10-CM Diagnosis Code N20.9

    Urinary calculus, unspecified

      2016 2017 2018 2019 2020 Billable/Specific Code
    N20.9
    )
  • obstructive uropathy (
    ICD-10-CM Diagnosis Code N13
    • N13 Obstructive and reflux uropathy
      • N13.0 Hydronephrosis with ureteropelvic junction ob...
      • N13.1 Hydronephrosis with ureteral stricture, not e...
      • N13.2 Hydronephrosis with renal and ureteral calcul...
      • N13.3 Other and unspecified hydronephrosis
        • N13.30 Unspecified hydronephrosis
        • N13.39 Other hydronephrosis
      • N13.4 Hydroureter
      • N13.5 Crossing vessel and stricture of ureter witho...
      • N13.6 Pyonephrosis
      • N13.7 Vesicoureteral-reflux
        • N13.70 …… unspecified
        • N13.71 Vesicoureteral-reflux without reflux nephropa...
        • N13.72 Vesicoureteral-reflux with reflux nephropathy...
          • N13.721 Vesicoureteral-reflux with reflux nephropathy...
          • N13.722 Vesicoureteral-reflux with reflux nephropathy...
          • N13.729 Vesicoureteral-reflux with reflux nephropathy...
        • N13.73 Vesicoureteral-reflux with reflux nephropathy...
          • N13.731 Vesicoureteral-reflux with reflux nephropathy...
          • N13.732 Vesicoureteral-reflux with reflux nephropathy...
          • N13.739 Vesicoureteral-reflux with reflux nephropathy...
      • N13.8 Other obstructive and reflux uropathy
      • N13.9 Obstructive and reflux uropathy, unspecified
    N13.-
    )
The following code(s) above N11.1 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to N11.1:
  • N00-N99
    2020 ICD-10-CM Range N00-N99

    Diseases of the genitourinary system

    Type 2 Excludes
    • certain conditions originating in the perinatal period (P04-P96)
    • certain infectious and parasitic diseases (A00-B99)
    • complications of pregnancy, childbirth and the puerperium (O00-O9A)
    • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
    • endocrine, nutritional and metabolic diseases (E00-E88)
    • injury, poisoning and certain other consequences of external causes (S00-T88)
    • neoplasms (C00-D49)
    • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
    Diseases of the genitourinary system
  • N10-N16
    2020 ICD-10-CM Range N10-N16

    Renal tubulo-interstitial diseases

    Includes
    • pyelonephritis
    Type 1 Excludes
    • pyeloureteritis cystica (N28.85)
    Renal tubulo-interstitial diseases
  • N11
    ICD-10-CM Diagnosis Code N11

    Chronic tubulo-interstitial nephritis

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Includes
    • chronic infectious interstitial nephritis
    • chronic pyelitis
    • chronic pyelonephritis
    Use Additional
    • code (B95-B97), to identify infectious agent.
    Chronic tubulo-interstitial nephritis
Approximate Synonyms
  • Chronic obstructive kidney stones
  • Recurrent obstructive pyelonephritis
ICD-10-CM N11.1 is grouped within Diagnostic Related Group(s) (MS-DRG v37.0):
  • 693 Urinary stones with mcc
  • 694 Urinary stones without mcc

Convert N11.1 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
Code annotations containing back-references to N11.1:
  • Type 2 Excludes: N13
    ICD-10-CM Diagnosis Code N13

    Obstructive and reflux uropathy

      2016 2017 2018 2019 2020 Non-Billable/Non-Specific Code
    Type 2 Excludes
    • 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)

Diagnosis Index entries containing back-references to N11.1:
  • Kink, kinking
    • ureter (pelvic junction) N13.5
      ICD-10-CM Diagnosis Code N13.5

      Crossing vessel and stricture of ureter without hydronephrosis

        2016 2017 2018 2019 2020 Billable/Specific Code
      Applicable To
      • Kinking and stricture of ureter without hydronephrosis
      Type 1 Excludes
      • Crossing vessel and stricture of ureter without hydronephrosis with infection (N13.6)
      • with
        • pyelonephritis N11.1 (chronic)
  • Nephritis, nephritic (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic) N05.9
    ICD-10-CM Diagnosis Code N05.9

    Unspecified nephritic syndrome with unspecified morphologic changes

      2016 2017 2018 2019 2020 Billable/Specific Code
    • tubulo-interstitial (in) N12
      ICD-10-CM Diagnosis Code N12

      Tubulo-interstitial nephritis, not specified as acute or chronic

        2016 2017 2018 2019 2020 Billable/Specific Code
      Applicable To
      • Interstitial nephritis NOS
      • Pyelitis NOS
      • Pyelonephritis NOS
      Type 1 Excludes
      • calculous pyelonephritis (N20.9)
      • chronic (infectious) N11.9
        ICD-10-CM Diagnosis Code N11.9

        Chronic tubulo-interstitial nephritis, unspecified

          2016 2017 2018 2019 2020 Billable/Specific Code
        Applicable To
        • Chronic interstitial nephritis NOS
        • Chronic pyelitis NOS
        • Chronic pyelonephritis NOS
        • obstructive N11.1
  • Obstruction, obstructed, obstructive
    • ureter (functional) (pelvic junction) N13.5
      ICD-10-CM Diagnosis Code N13.5

      Crossing vessel and stricture of ureter without hydronephrosis

        2016 2017 2018 2019 2020 Billable/Specific Code
      Applicable To
      • Kinking and stricture of ureter without hydronephrosis
      Type 1 Excludes
      • Crossing vessel and stricture of ureter without hydronephrosis with infection (N13.6)
      • with
        • pyelonephritis N11.1 (chronic)
    • pyelonephritis N11.1 (chronic)
  • Pyelonephritis - see also Nephritis, tubulo-interstitial
    • chronic N11.9
      ICD-10-CM Diagnosis Code N11.9

      Chronic tubulo-interstitial nephritis, unspecified

        2016 2017 2018 2019 2020 Billable/Specific Code
      Applicable To
      • Chronic interstitial nephritis NOS
      • Chronic pyelitis NOS
      • Chronic pyelonephritis NOS
      • associated with ureteral obstruction or stricture N11.1
      • obstructive N11.1
    • in (due to)
      • obstruction N11.1
  • Pyelonephrosis (obstructive) N11.1
  • Stricture - see also Stenosis
    • ureter (postoperative) N13.5
      ICD-10-CM Diagnosis Code N13.5

      Crossing vessel and stricture of ureter without hydronephrosis

        2016 2017 2018 2019 2020 Billable/Specific Code
      Applicable To
      • Kinking and stricture of ureter without hydronephrosis
      Type 1 Excludes
      • Crossing vessel and stricture of ureter without hydronephrosis with infection (N13.6)
      • with
        • pyelonephritis N11.1 (chronic)

ICD-10-CM Codes Adjacent To N11.1
N07.4 Hereditary nephropathy, not elsewhere classified with diffuse endocapillary proliferative glomerulonephritis
N07.5 Hereditary nephropathy, not elsewhere classified with diffuse mesangiocapillary glomerulonephritis
N07.6 Hereditary nephropathy, not elsewhere classified with dense deposit disease
N07.7 Hereditary nephropathy, not elsewhere classified with diffuse crescentic glomerulonephritis
N07.8 Hereditary nephropathy, not elsewhere classified with other morphologic lesions
N07.9 Hereditary nephropathy, not elsewhere classified with unspecified morphologic lesions
N08 Glomerular disorders in diseases classified elsewhere
N10 Acute pyelonephritis
N11 Chronic tubulo-interstitial nephritis
N11.0 Nonobstructive reflux-associated chronic pyelonephritis
N11.1 Chronic obstructive pyelonephritis
N11.8 Other chronic tubulo-interstitial nephritis
N11.9 Chronic tubulo-interstitial nephritis, unspecified
N12 Tubulo-interstitial nephritis, not specified as acute or chronic
N13 Obstructive and reflux uropathy
N13.0 Hydronephrosis with ureteropelvic junction obstruction
N13.1 Hydronephrosis with ureteral stricture, not elsewhere classified
N13.2 Hydronephrosis with renal and ureteral calculous obstruction
N13.3 Other and unspecified hydronephrosis
N13.30 Unspecified hydronephrosis
N13.39 Other hydronephrosis

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.