2026 ICD-10-CM Diagnosis Code N28.0Ischemia and infarction of kidney

ICD-10-CM Codes›N00–N99›N25-N29›N28

ICD-10-CM N28.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N28.0 is a billable ICD-10-CM diagnosis code for ischemia and infarction of kidney. 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 Other specified and unspecified diseases of kidney and ureters.

Code Identity

ICD-10-CM Code
N28.0
Billable Status
Yes — Valid for Submission
Code Describes
Ischemia and infarction of kidney
Short Description
Ischemia and infarction of kidney
Same as the full description in the CMS dataset.
Parent Code
N28
Other disorders of kidney and ureter, not elsewhere classified

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN25-N29Other disorders of kidney and ureter
CategoryN28Other disorders of kidney and ureter, not elsewhere classified
This CodeN28.0Ischemia and infarction of kidney

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute occlusion of visceral artery due to thromboembolus
  • Acute occlusion of visceral artery due to thrombosis
  • Acute renal cortical necrosis
  • Acute renal failure due to ischemia
  • Acute scleroderma renal crisis
  • Acute thromboembolic renal artery occlusion
  • Acute thrombotic renal artery occlusion
  • Acute tubular necrosis
  • Acute tubular necrosis due to ischemia
  • Chronic tubulointerstitial nephritis due to ischemia
  • Contracted kidney
  • Ischemia of kidney
  • Ischemic contracture of kidney
  • Ischemic nephropathy
  • Occlusion of renal artery due to embolism
  • Renal artery embolism
  • Renal artery occlusion
  • Renal infarction
  • Renal infarction - arterial
  • Renal infarction - venous
  • Renal involvement in scleroderma
  • Small kidney
  • Thromboembolism of renal arteries
  • Thrombosis of renal artery

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Renal artery embolism
  • Renal artery obstruction
  • Renal artery occlusion
  • Renal artery thrombosis
  • Renal infarct

Type 1 Excludes

  • atherosclerosis of renal artery extrarenal part I70.1
  • congenital stenosis of renal artery Q27.1
  • Goldblatt's kidney I70.1

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.

    • Crisis
      • renal
    • Embolism(multiple) (paradoxical)
      • artery
        • renal
    • Embolism(multiple) (paradoxical)
      • kidney (artery)
    • Embolism(multiple) (paradoxical)
      • renal (artery)
    • Infarct, infarction
      • brewer's (kidney)
    • Infarct, infarction
      • kidney
    • Infarct, infarction
      • renal (embolic) (thrombotic)
    • Ischemia, ischemic
      • kidney
    • Ischemia, ischemic
      • renal
    • Necrosis, necrotic(ischemic)
      • kidney (bilateral)
    • Obstruction, obstructed, obstructive
      • artery
        • renal
    • Occlusion, occluded
      • artery
        • renal
    • Occlusion, occluded
      • renal artery
    • Thrombosis, thrombotic(bland) (multiple) (progressive) (silent) (vessel)
      • artery, arteries (postinfectional)
        • renal
    • Thrombosis, thrombotic(bland) (multiple) (progressive) (silent) (vessel)
      • kidney (artery)
    • Thrombosis, thrombotic(bland) (multiple) (progressive) (silent) (vessel)
      • renal (artery)
    • Torsion
      • kidney (pedicle) (leading to infarction)

Clinical ClassificationClinical

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

CCSR GEN006
Other specified and unspecified diseases of kidney and ureters
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • 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 N28.0 to ICD-9-CMHistory

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

ICD-9-CM
593.81 Renal vascular disorder
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 N28.0Overview

Is N28.0 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report ischemia and infarction of kidney on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does N28.0 group to?

When ischemia and infarction of kidney 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 N28.0?

Under the General Equivalence Mappings, ischemia and infarction of kidney converts to ICD-9-CM 593.81 (renal vascular disorder). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.