Billable / Specific Code
ICD-10-CM N11.1 is the diagnosis code for Chronic obstructive pyelonephritis. This code falls under the section "Renal tubulo-interstitial diseases" within Chapter 14 — Diseases of the genitourinary system (N00-N99). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions should never be coded at the same time as N11.1. They are mutually exclusive:
Understanding where N11.1 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, N11.1 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
N11.1 is the ICD-10-CM diagnosis code for "Chronic obstructive pyelonephritis". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of N11.1 is N11 ("Chronic tubulo-interstitial nephritis"). N11.1 provides a more specific classification within this category.
N11.1 is located in Section N10-N16 — "Renal tubulo-interstitial diseases" within Chapter 14 of the ICD-10-CM Tabular List.
Use N11.1 when the patients documented diagnosis matches "Chronic obstructive pyelonephritis" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Chronic obstructive pyelonephritis is N11.1.
Yes, N11.1 can be used as a primary diagnosis code since it is billable and specific.
N11.1 is in Chapter 14 of the ICD-10-CM Tabular List.
Type 1 Excludes for N11.1 include: calculous pyelonephritis (N20.9); obstructive uropathy (N13.-).
Yes, N11.1 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.