ICD-10-CM Code N12

Valid for Submission

N12 is a billable code used to specify a medical diagnosis of tubulo-interstitial nephritis, not specified as acute or chronic. The code is valid for the year 2020 for the submission of HIPAA-covered transactions. The ICD-10-CM code N12 might also be used to specify conditions or terms like acute interstitial nephritis, anti-glomerular basement membrane tubulointerstitial nephritis, diffuse pyelonephritis, familial interstitial nephritis, granulomatous interstitial nephritis, idiopathic granulomatous interstitial nephropathy, etc

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code N12:

Inclusion Terms

Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.

• Interstitial nephritis NOS
• Pyelitis NOS
• Pyelonephritis NOS

Type 1 Excludes

Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

• calculous pyelonephritis N20.9

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code N12 are found in the index:

• - Disease, diseased - See Also: Syndrome;
  • - antiglomerular basement membrane (anti- GBM) antibody - M31.0
    • - tubulo-interstitial nephritis - N12
  • - renal (functional) (pelvis) - See Also: Disease, kidney; - N28.9
    • - with
      • - interstitial nephritis - N12

• - Nephritis, nephritic (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic) - N05.9
  • - antitubular basement membrane (tubulo-interstitial) NEC - N12
  • - tubulo-interstitial (in) - N12

• - Pyelonephritis - See Also: Nephritis, tubulo-interstitial;
  • - nonobstructive - N12

• - Pyonephritis - N12

Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

• Acute interstitial nephritis
• Anti-glomerular basement membrane tubulointerstitial nephritis
• Diffuse pyelonephritis
• Familial interstitial nephritis
• Granulomatous interstitial nephritis
• Idiopathic granulomatous interstitial nephropathy
• Idiopathic interstitial nephritis
• Immunologic mediated TIN
• Interstitial nephritis
• Mycoplasmal pyelonephritis
• Primary tubulointerstitial nephritis
• Pyelitis
• Pyelonephritis
• Renal tubulo-interstitial disorders in blood diseases and disorders involving the immune mechanism
• Secondary tubulointerstitial nephritis
• Subacute pyelonephritis
• Tubulointerstitial nephritis
• Tubulointerstitial nephritis with uveitis syndrome

Diagnostic Related Groups

The ICD-10 code N12 is grouped in the following groups for version MS-DRG V37.0 What are Diagnostic Related Groups?
The Diagnostic Related Groups (DRGs) are a patient classification scheme which provides a means of relating the type of patients a hospital treats. The DRGs divides all possible principal diagnoses into mutually exclusive principal diagnosis areas referred to as Major Diagnostic Categories (MDC). applicable from 10/01/2019 through 09/30/2020.

• 689 - KIDNEY AND URINARY TRACT INFECTIONS WITH MCC
• 690 - KIDNEY AND URINARY TRACT INFECTIONS WITHOUT MCC

Convert N12 to ICD-9

• 590.80 - Pyelonephritis NOS (Approximate Flag)

Code Classification

• Diseases of the genitourinary system (N00–N99)
  • Renal tubulo-interstitial diseases (N10-N16)
    • Tubulo-interstitial nephritis, not spcf as acute or chronic (N12)

Code History

• FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
  (First year ICD-10-CM implemented into the HIPAA code set)
• FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
• FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
• FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
• FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020

Tools

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• Convert N12 to ICD-9