2026 ICD-10-CM Diagnosis Code N26.9Renal sclerosis, unspecified

ICD-10-CM Codes›N00–N99›N25-N29›N26

ICD-10-CM N26.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N26.9 is a billable ICD-10-CM diagnosis code for renal sclerosis, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 698 through 700. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nephritis; nephrosis; renal sclerosis.

Code Identity

ICD-10-CM Code
N26.9
Billable Status
Yes — Valid for Submission
Code Describes
Renal sclerosis, unspecified
Short Description
Renal sclerosis, unspecified
Same as the full description in the CMS dataset.
Parent Code
N26
Unspecified contracted kidney

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN25-N29Other disorders of kidney and ureter
CategoryN26Unspecified contracted kidney
This CodeN26.9Renal sclerosis, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Chronic drug-induced renal disease
  • Congenital nephrotic syndrome
  • Diffuse mesangial sclerosis
  • Diffuse mesangial sclerosis with ocular abnormalities
  • Disorder of kidney co-occurrent with human immunodeficiency virus infection
  • Familial mesangial sclerosis
  • Focal segmental glomerulosclerosis
  • Focal segmental glomerulosclerosis caused by lithium
  • Focal segmental glomerulosclerosis caused by substance
  • Focal segmental glomerulosclerosis co-occurrent with human immunodeficiency virus infection
  • Focal segmental glomerulosclerosis due to sickle cell disease
  • Focal segmental glomerulosclerosis with infectious disease
  • Glomerular disease due to diffuse mesangial sclerosis
  • Glomerular disease due to hematological disease
  • Glomerular fibrosis
  • Glomerulosclerosis
  • Idiopathic nodular glomerulosclerosis
  • Ischemia of kidney
  • Ischemic glomerulopathy
  • Ischemic nephropathy
  • Lithium nephropathy
  • Renal fibrosis
  • Renal interstitial fibrosis
  • Renal sclerosis with hypertension

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Contraction(s), contracture, contracted
      • kidney (granular) (secondary)
    • Fibrosis, fibrotic
      • kidney
    • Nephritis, nephritic(albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic)
      • cirrhotic
    • Nephrosclerosis(arteriolar)(arteriosclerotic) (chronic) (hyaline)
      • senile
    • Sclerosis, sclerotic
      • renal

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR GEN001
Nephritis; nephrosis; renal sclerosis
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Ischemic Glomerulopathy

    a renal disorder characterized by glomerular damage due to ischemia. it leads to progressive deterioration of renal function.

  • Congenital Nephrotic Syndrome

    a rare autosomal recessive inherited nephrotic syndrome that is present in the first week of life. it manifests with edema and proteinuria and usually has a poor prognosis.

  • Congenital Nephrotic Syndrome - Cytomegalovirus Associated|Cytomegalovirus Associated Congenital Nephrotic Syndrome

    nephrotic syndrome associated with a cytomegalovirus infection, most commonly presenting in the first three months of life.

  • Congenital Nephrotic Syndrome - Diffuse Mesangial Sclerosis|Diffuse Mesangial Sclerosis|Diffuse Mesangial Sclerosis

    nephrotic syndrome within the first three motnhs of life, characterized initially by increased mesangial matrix, with or without hypertrophy and hyperplasia of podocytes, and eventual glomerular sclerosis.

  • Congenital Nephrotic Syndrome - Focal Segmental Glomerulosclerosis|Congenital FSGS|Congenital FSGS

    nephrotic syndrome within the first three months of life, characterized by scarring of the glomerulus, in which only part of the glomerulus is involved, and less than 50% of the glomeruli are affected.

  • Congenital Nephrotic Syndrome - Infection Associated|Infection Associated Congenital Nephrotic Syndrome

    nephrotic syndrome presenting within the first three months of life, and which is associated with an infectious process.

  • Congenital Nephrotic Syndrome - Rubivirus Associated|Rubivirus Associated Congenital Nephrotic Syndrome

    nephrotic syndrome associated with rubella, most commonly presenting in the first three months of life.

  • Congenital Nephrotic Syndrome - Toxoplasma Associated|Toxoplasma Associated Congenital Nephrotic Syndrome

    nephrotic syndrome associated with toxoplasmosis, most commonly presenting in the first three months of life.

  • Congenital Nephrotic Syndrome - Treponema Pallidum Associated|Treponema Pallidum Associated Congenital Nephrotic Syndrome

    nephrotic syndrome associated with syphilis, most commonly presenting in the first three months of life.

  • Nephrotic Syndrome - NPHS1 Associated|Congenital Nephrotic Syndrome - Finnish Type

    nephrotic syndrome attributed to mutation(s) in the nphs1 gene, which encodes the protein nephrin, and most commonly presents during the first three months of life.

  • Ischemic Nephropathy

    nephropathy due to hypoperfusion of the kidney.

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.

Convert N26.9 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
587 Renal sclerosis NOS
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About N26.9Overview

Is N26.9 (Unspecified contracted kidney) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report renal sclerosis, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does N26.9 group to?

When renal sclerosis, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 698, 699, 700, with relative weights from 0.6899 to 1.6544 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of N26.9?

Under the General Equivalence Mappings, renal sclerosis, unspecified converts to ICD-9-CM 587 (renal sclerosis NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.