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ICD-10-CM Code N11.9
Chronic tubulo-interstitial nephritis, unspecified

Billable Code
Billable codes are sufficient justification for admission to an acute care hospital when used a principal diagnosis.
| ICD-10 from 2011 - 2016

N11.9 is a billable ICD code used to specify a diagnosis of chronic tubulo-interstitial nephritis, unspecified. A 'billable code' is detailed enough to be used to specify a medical diagnosis.

The ICD code N11 is used to code Interstitial nephritis

Interstitial nephritis (or tubulo-interstitial nephritis) is a form of nephritis affecting the interstitium of the kidneys surrounding the tubules. This disease can be either acute, meaning it occurs suddenly, or chronic, meaning it is ongoing and eventually ends in kidney failure.

Specialty: Urology
MeSH Codes: D009395, D009395, D009395, D009395,
ICD 9 Codes: 580.89, 581.89, 582.89, 583.89,
Source: Wikipedia

Coding Notes for N11.9 Info for medical coders on how to properly use this ICD-10 code

Inclusion Terms:
Inclusion Terms
Inclusion Terms are a list of concepts for which a specific code is used. The list of Inclusion Terms is useful for determining the correct code in some cases, but the list is not necessarily exhaustive.
Chronic interstitial nephritis NOS
Chronic pyelitis NOS
Chronic pyelonephritis NOS

MS-DRG Mapping

  • DRG Group #689-690 - Kidney and urinary tract infections with MCC.
  • DRG Group #689-690 - Kidney and urinary tract infections without MCC.
  • DRG Group #793 - Full term neonate with major problems.

Related Concepts SNOMET-CT

  • Chronic pyelitis (disorder)
  • Chronic infective interstitial nephritis (disorder)

Coding Advice SNOMET-CT

  • Possible requirement for additional code to fully describe disease or condition
  • Possible requirement for causative agent code
  • Consider additional code to identify specific condition or disease


Pyelonephritis, unspecified (approximate match)

This is the official approximate match mapping between ICD9 and ICD10, as provided by the General Equivalency mapping crosswalk. This means that while there is no exact mapping between this ICD10 code N11.9 and a single ICD9 code, 590.80 is an approximate match for comparison and conversion purposes.

Parent Code: N11 - Chronic tubulo-interstitial nephritis

** This Document Provided By ICD.Codes **
Source: http://icd.codes/icd10cm/N119