2027 ICD-10-CM Diagnosis Code N05Unspecified nephritic syndrome

ICD-10-CM Codes›N00–N99›N00-N08›N05

ICD-10-CM N05
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

N05 is a non-billable ICD-10-CM category code for unspecified nephritic syndrome, so it cannot be submitted on claims. Use a more specific code from this category instead, such as N05.0, N05.1, N05.2, and N05.3.

Code Identity

ICD-10-CM Code
N05
Billable Status
No — Non-Billable Category
Code Describes
Unspecified nephritic syndrome
Short Description
Unspecified nephritic syndrome
Same as the full description in the CMS dataset.
Chapter
N00-N08
Glomerular diseases

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN00-N08Glomerular diseases
CategoryN05Unspecified nephritic syndrome
This CodeN05Unspecified nephritic syndrome

Specific Coding for Unspecified nephritic syndromeOverview

Non-specific codes like N05 require more characters. Use one of these billable codes instead:

  • Use N05.0 for Unspecified nephritic syndrome with minor glomerular abnormality

  • Use N05.1 for Unspecified nephritic syndrome with focal and segmental glomerular lesions

  • Use N05.2 for Unspecified nephritic syndrome with diffuse membranous glomerulonephritis

  • Use N05.3 for Unspecified nephritic syndrome with diffuse mesangial proliferative glomerulonephritis

  • Use N05.4 for Unspecified nephritic syndrome with diffuse endocapillary proliferative glomerulonephritis

  • Use N05.5 for Unspecified nephritic syndrome with diffuse mesangiocapillary glomerulonephritis

  • Use N05.6 for Unspecified nephritic syndrome with dense deposit disease

  • Use N05.7 for Unspecified nephritic syndrome with diffuse crescentic glomerulonephritis

  • Use N05.8 for Unspecified nephritic syndrome with other morphologic changes

  • Use N05.9 for Unspecified nephritic syndrome with unspecified morphologic changes

  • Use N05.A for Unspecified nephritic syndrome with C3 glomerulonephritis

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to N05: its own notes plus those printed at block N00-N08 and Chapter 14. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

  • glomerular disease NOS
  • glomerulonephritis NOS
  • nephritis NOS
  • nephropathy NOS and renal disease NOS with morphological lesion specified in .0-.8

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

On N05 itself
  • nephropathy NOS with no stated morphological lesion (N28.9)
  • renal disease NOS with no stated morphological lesion (N28.9)
  • tubulo-interstitial nephritis NOS (N12)
From Block N00-N08 Glomerular diseases applies to 107 codes
  • hypertensive chronic kidney disease (I12.-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 14 (N00-N99) Diseases of the genitourinary system applies to 838 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Code Also

A second code may be needed to fully describe the condition; the note gives no sequencing direction.

From Block N00-N08 Glomerular diseases applies to 107 codes
  • any associated kidney failure (N17-N19).

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name N05, its category, or a range that includes it.

Excludes1 4

These codes carry an Excludes1 note naming N05: they are not reported together with it, unless the two conditions are unrelated.

  • N00 Acute nephritic syndrome
    nephritic syndrome NOS (N05.-)
  • N01 Rapidly progressive nephritic syndrome
    nephritic syndrome NOS (N05.-)
  • N03 Chronic nephritic syndrome
    nephritic syndrome NOS (N05.-)
  • N28.9 Disorder of kidney and ureter, unspecified
    unspecified nephritic syndrome (N05.-)

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Patient EducationClinical

Kidney Diseases

You have two kidneys, each about the size of your fist. They are near the middle of your back, just below the rib cage. Inside each kidney there are about a million tiny structures called nephrons. They filter your blood. They remove wastes and extra water, which become urine. The urine flows through tubes called ureters.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About N05Overview

What is the ICD-10 code for unspecified nephritic syndrome?

N05 is the ICD-10-CM category for unspecified nephritic syndrome, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is N05 (Unspecified nephritic syndrome) a billable code?

No. This is a category header that groups the codes for unspecified nephritic syndrome, and headers cannot be submitted on claims. Claims for unspecified nephritic syndrome need a more specific code from this category, such as N05.0, N05.1, and N05.2.

Can N05 be reported with N28.9?

Not as a rule. The Excludes1 note on N05 lists "nephropathy NOS with no stated morphological lesion (N28.9)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).