1. Home
2. ICD-10 Codes
3. Chapter - N00-N99
4. Section - N10-N16
5. Category - N11
6. N11.1

N11.1 - Chronic obstructive pyelonephritis

• Applicable to Chronic obstructive pyelonephritis
• The 2025 edition of ICD10-CM N11.1 became effective on October 1, 2024.
• This is the American ICD10-CM version of N11.1 - other international versions of ICD10 N11.1 may differ.
• N11.1 is a Billable / Specific ICD10-CM code that can be used to indicate a diagnosis for reimbursement purposes.

• 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

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

The following codes above N11.1 contain annotation back-references that may be applicable to N11.1:

• Chapter: N00-N99 - Diseases of the genitourinary system
• Section: N10-N16 - Renal tubulo-interstitial diseases
• Category: N11 - Chronic tubulo-interstitial nephritis

Browse other similar CM codes:

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