N00.3 ICD-10-CA code: Acute nephritic syndrome, diffuse mesangial proliferative glomerulonephritis

N00.3 is the ICD-10-CA code for “Acute nephritic syndrome, diffuse mesangial proliferative glomerulonephritis” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.

Official description

N00.3

Acute nephritic syndrome, diffuse mesangial proliferative glomerulonephritis

Short description: Ac neph syndr diff mesngl prolf glomneph

ICD-10-CA · Canada · Also written N003

Notes for N00.3

As CIHI prints them, with any note N00.3 takes from the headings above it.

Includes

Acute:• glomerular disease• glomerulonephritis• nephritis• renal disease NOSFrom N00 Acute nephritic syndrome

Use additional code

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

Use additional code to identify associated chronic kidney disease (N18.-)From N00-N08 Glomerular diseases
Use additional code to identify external cause (Chapter XX) or presence of renal failure, Acute (N17) or Unspecified (N19)From N00-N08 Glomerular diseases

Excludes

Conditions classified elsewhere.

Acute tubulo-interstitial nephritis (N10)nephritic syndrome NOS (N05.-)From N00 Acute nephritic syndrome
Hypertensive renal disease (I12)From N00-N08 Glomerular 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)

Note

See note under chapter heading (N00-N08) for fourth character subdivision.From N00 Acute nephritic syndrome
The following fourth-character subdivisions classify morphological changes and are for use with categories N00 - N07. Subdivisions .0 - .8 should not normally be used unless these have been specifically identified (e.g. by renal biopsy or autopsy). The three-character categories relate to clinical syndromes..0 Minor glomerular abnormalityMinimal change lesion.1 Focal and segmental glomerular lesionsGlomerulonephritis, Hyalinosis, Sclerosis — focal and segmental.2 Diffuse membranous glomerulonephritis.3 Diffuse mesangial proliferative glomerulonephritis.4 Diffuse endocapillary proliferative glomerulonephritis.5 Diffuse mesangiocapillary glomerulonephritisMembranoproliferative glomerulonephritis, types 1 and 3, or NOS.6 Dense deposit diseaseMembranoproliferative glomerulonephritis, type 2.7 Diffuse crescentic glomerulonephritisExtracapillary glomerulonephritis.8 OtherProliferative glomerulonephritis NOS.9 UnspecifiedFrom N00-N08 Glomerular diseases

Where N00.3 sits

1ChapterChapter 14: Diseases of the genitourinary system (N00-N99)
2Block N00-N08Glomerular diseases
3Category N00Acute nephritic syndrome
4Valid code N00.3Acute nephritic syndrome, diffuse mesangial proliferative glomerulonephritis

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 N00.3 in the CIHI source

Frequently asked questions

What does ICD-10-CA code N00.3 mean?

N00.3 is the ICD-10-CA code for “Acute nephritic syndrome, diffuse mesangial proliferative glomerulonephritis” in CIHI’s ICD-10-CA FY 2026–2027 release.

Where is N00.3 in ICD-10-CA?

N00.3 sits under N00 Acute nephritic syndrome, within N00-N08 Glomerular diseases, within Chapter 14: Diseases of the genitourinary system (N00-N99).

What coding notes apply to N00.3?

ICD-10-CA lists Note, Includes, Excludes, Use additional code notes for N00.3, 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.

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