N11.1

ICD-10Billable

Chronic obstructive pyelonephritis

Official ICD-10-CM descriptor (FY2026)

Chronic obstructive pyelonephritis

N11.1 is valid for submission on a claim — CMS flags it as a billable, specific code.

Inclusion terms

  • 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

Excludes1

Not coded here. An Excludes1 code should never be reported at the same time as the code above it.

  • calculous pyelonephritis (N20.9)
  • obstructive uropathy (N13.-)

Related codes in N11

Where this code sits

Parent code
N11

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Source

ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.

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