All ICD10 Codes

N11.1

Billable
ChapterN00–N99
Ranksubcategory
Official Description

Chronic obstructive pyelonephritis

Metadata & Insights
  • •2026 ICD-10-CM Edition - Effective October 1, 2025.
  • •Billable/specific code (valid for reimbursement).
  • •Chapter 14: Diseases of the Genitourinary System (N00-N99).

Instructional Notes

Includes
  • 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)
  • calculous pyelonephritis (N20.9)
  • obstructive uropathy (N13.-)
General instructions are available for the parent sections:
View CH14 NotesView N10-N16 NotesView N11 Notes

Clinical Hierarchy

CH14Diseases of the genitourinary system (N00-N99)
N10-N16Renal tubulo-interstitial diseases (N10-N16)
N11Chronic tubulo-interstitial nephritis
N11.1Chronic obstructive pyelonephritis

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to N11.1:

categoryN11
Chronic tubulo-interstitial nephritis
View context instructions
blockN10-N16
Renal tubulo-interstitial diseases (N10-N16)
View context instructions
chapterCH14
Diseases of the genitourinary system (N00-N99)
View context instructions

Alphabetic Index Mentions

These are Diagnosis Index lookup paths that route to N11.1. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

9 raw paths
Kink, kinking1 unique routes
ureter (pelvic junction)
with
pyelonephritis (chronic)→N11.1
Nephritis, nephritic (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic)1 unique routes
tubulo-interstitial (in)
chronic (infectious)
obstructive→N11.1
Obstruction, obstructed, obstructive2 unique routes
pyelonephritis (chronic)→N11.1
ureter (functional) (pelvic junction) NEC
with
pyelonephritis (chronic)→N11.1
Pyelonephritis3 unique routes
chronic(2 variants)
associated with ureteral obstruction or stricture→N11.1
obstructive→N11.1
in (due to)
obstruction→N11.1
Pyelonephrosis (obstructive)1 unique routes
Direct index entry→N11.1
Stricture1 unique routes
ureter (postoperative)
with
pyelonephritis (chronic)→N11.1

MS-DRG Classification

2026 v43.1

This code is grouped within the following Diagnosis Related Group(s) for clinical reimbursement:

DRG 693
Urinary Stones with MCC
DRG 694
Urinary Stones without MCC

Cross Reference

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