ICD-10-CM 2027 diagnosis code

N11Chronic tubulo-interstitial nephritis

Not billable — use a more specific code

N11 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About N11

N11 is the ICD-10-CM diagnosis code for chronic tubulo-interstitial nephritis. It belongs to block N10-N16 (renal tubulo-interstitial diseases) and chapter 14 (diseases of the genitourinary system). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: N11.0 (pyelonephritis), N11.1 (pyelonephritis), N11.8 (nephritis) and N11.9 (unspecified).

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

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under N11

Coding notes

IncludesFurther defines the content of the category

chronic infectious interstitial nephritis
chronic pyelitis
chronic pyelonephritis

Use additional codeAdd a secondary code to fully describe the condition

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

Notes that apply from higher levels

Instructions written at a parent level also apply to N11.

Broader instructions also apply from N10-N16 Renal tubulo-interstitial diseases and Chapter 14: Diseases of the genitourinary system.

Codes whose notes reference N11

N03Excludes1

Code history

2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about N11

Is N11 billable?: No. N11 is a header code. Report one of its more specific subcodes instead.