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N12 ICD-10-CA code: Tubulo-interstitial nephritis, not specified as acute or chronic

N12 is the ICD-10-CA code for “Tubulo-interstitial nephritis, not specified as acute or chronic” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.

Official description

N12

Tubulo-interstitial nephritis, not specified as acute or chronic

Short description: Tubulointerstitial nephritis NOS

ICD-10-CA · Canada

Index terms

Entries in CIHI’s alphabetical index that lead to N12. Searching the index by the condition the note names is how coders reach this code.

  • Pyonephritis
  • Cystopyelitis
  • Pyelocystitis
  • Pyelonephritis
  • Nephrocystitis, pustular
  • Pyelitis (congenital) (uremic)
  • Pyelonephritis, nonobstructive
  • Nephritis, nephritic, tubulo interstitial (in)
  • Disease, diseased, kidney (functional) (pelvis), tubular
  • Disease, diseased, kidney (functional) (pelvis), with, interstitial nephritis
  • Nephritis, nephritic, antitubular basement membrane (tubulo interstitial) NEC

Notes for N12

As CIHI prints them, with any note N12 takes from the headings above it.

Includes

Use additional code

Add a code for this detail when the note documents it.

Excludes

Conditions classified elsewhere.

  • Calculous pyelonephritis (N20.9)
  • Pyeloureteritis cystica (N28.84)From N10-N16 Renal tubulo-interstitial diseases
  • Certain conditions originating in the perinatal period (P00-P96)certain infectious and parasitic diseases (A00-B99)complications of pregnancy, childbirth and the puerperium (O00-O99)congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)endocrine, nutritional and metabolic diseases (E00-E90)injury, poisoning and certain other consequences of external causes (S00-T98)neoplasms (C00-D48)symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R99)From Chapter 14: Diseases of the genitourinary system (N00-N99)

Where N12 sits

  1. 1ChapterChapter 14: Diseases of the genitourinary system (N00-N99)
  2. 2Block N10-N16Renal tubulo-interstitial diseases
  3. 3Valid code N12Tubulo-interstitial nephritis, not specified as acute or chronic

Source and release

Data release
ICD-10-CA · FY 2026–2027
Effective date
Apr 1, 2026
Publisher
CIHI

This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.

See N12 in the CIHI source

Frequently asked questions

What does ICD-10-CA code N12 mean?

N12 is the ICD-10-CA code for “Tubulo-interstitial nephritis, not specified as acute or chronic” in CIHI’s ICD-10-CA FY 2026–2027 release.

Where is N12 in ICD-10-CA?

N12 sits under N10-N16 Renal tubulo-interstitial diseases, within Chapter 14: Diseases of the genitourinary system (N00-N99).

What coding notes apply to N12?

ICD-10-CA lists Includes, Excludes, Use additional code notes for N12, including those from the headings it sits under. They are listed on this page with where each one comes from.

Which ICD-10-CA release does this page use?

It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.

Codes beside N12

N10Acute tubulo-interstitial nephritisN11Chronic tubulo-interstitial nephritisN13Obstructive and reflux uropathyN14Drug- and heavy-metal-induced tubulo-interstitial and tubular conditionsN15Other renal tubulo-interstitial diseasesN16Renal tubulo-interstitial disorders in diseases classified elsewhere