What does ICD-10 code N11 mean?

ICD-10 code N11 is the standardized code used for chronic tubulo-interstitial nephritis in medical records and coding systems.

When is ICD-10 code N11 used?

Doctors, hospitals, and insurers may use ICD-10 code N11 when recording chronic tubulo-interstitial nephritis in a standardized format. This entry may also act as a broader category that points toward more specific child codes.

Does ICD-10 code N11 confirm a diagnosis?

No. A code helps standardize documentation and claims, but it should not be read as a substitute for a clinician's full assessment.

ICD10

ICD-10 Code N11: Chronic tubulo-interstitial nephritis

Name: ICD-10 Code N11: Chronic tubulo-interstitial nephritis
Creator: HealthAssure Clinical Team
Published: 2026-05-21T06:26:32.865Z

N11 is an ICD-10 diagnosis entry used to group records related to Chronic tubulo-interstitial nephritis. You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen. ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Diseases of the genitourinary system (N00-N99).

Reviewed by HealthAssure Clinical TeamUpdated 21 May 2026

What is this code?

ICD-10 entries help standardize how diagnoses are organized for coding, reporting, analytics, and documentation. This code sits within the broader ICD-10 area for Diseases of the genitourinary system (N00-N99).

When is it used?

May be used when a clinician documents chronic tubulo-interstitial nephritis in a patient's medical record.
May appear in hospital records, claims, referrals, and clinical documentation.
This code may act more like a grouping or parent code, so a more specific child code may be used in final documentation when available.

What it does not mean

A code alone does not explain severity, treatment plan, or outcome.
A medical code should not be treated as a substitute for a doctor's diagnosis or advice.
This entry may represent a broader category rather than the most specific billable code.

Code hierarchy

chapter

14Diseases of the genitourinary system (N00-N99)

block

N10-N16Renal tubulo-interstitial diseases

currentN10-N16

Official coding notes

Includes

chronic infectious interstitial nephritis
chronic pyelitis
chronic pyelonephritis

Applicable to

code (B95-B97), to identify infectious agent.

Use additional code

code (B95-B97), to identify infectious agent.

Where you may see this code

You may see this entry in coding references, medical records, or claims workflows when a broader diagnosis category is being reviewed before a more specific code is chosen.

Related specialists

UrologistGynecologist

Sibling codes

N10Acute pyelonephritisbillable N12Tubulo-interstitial nephritis, not specified as acute or chronicbillable N13Obstructive and reflux uropathy N14Drug- and heavy-metal-induced tubulo-interstitial and tubular conditions N15Other renal tubulo-interstitial diseases N16Renal tubulo-interstitial disorders in diseases classified elsewherebillable

Coding guidelines

Compatibility

Legacy code aligns to an official FY 2026 category. Frontend should resolve to the official category page and surface the billable child codes.

Legacy codes

N11

Replacement codes

N11.0 — Nonobstructive reflux-associated chronic pyelonephritisN11.1 — Chronic obstructive pyelonephritisN11.8 — Other chronic tubulo-interstitial nephritisN11.9 — Chronic tubulo-interstitial nephritis, unspecified

Common synonyms

Chronic tubulo-interstitial nephritis

Frequently asked questions

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.