N11.9

Billable

ChapterN00–N99

Ranksubcategory

Official Description

Chronic tubulo-interstitial nephritis, unspecified

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

Chronic interstitial nephritis NOS
Chronic pyelitis NOS
Chronic pyelonephritis NOS

General instructions are available for the parent sections:

View CH14 Notes View N10-N16 Notes View N11 Notes

Clinical Hierarchy

CH14Diseases of the genitourinary system (N00-N99)

N10-N16Renal tubulo-interstitial diseases (N10-N16)

N11Chronic tubulo-interstitial nephritis

N11.9Chronic tubulo-interstitial nephritis, unspecified

Applicable Ancestor Context

The following parent sections contain instructions or notes that apply to N11.9:

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 N11.9. Use them as entry terms for search, then confirm final coding instructions in the Tabular List and notes above.

6 raw paths

Nephritis, nephritic (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic)1 unique routes

tubulo-interstitial (in)

chronic (infectious)→N11.9

Pyelitis (congenital) (uremic)2 unique routes

chronic→N11.9

with

contracted kidney→N11.9

Pyelonephritis2 unique routes

chronic→N11.9

with

contracted kidney→N11.9

Pyelonephrosis (obstructive)1 unique routes

chronic→N11.9

MS-DRG Classification

2026 v43.1

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

DRG 689

Kidney and Urinary Tract Infections with MCC

DRG 690

Kidney and Urinary Tract Infections without MCC

DRG 791

Prematurity with Major Problems

DRG 793

Full Term Neonate with Major Problems

Cross Reference

Find Procedures (ICD-10-PCS)

Find surgical and procedural codes related to Chronic tubulo-interstitial nephritis, unspecified.

Search PCS Codes