2026 ICD-10-CM Diagnosis Code N17.1Acute kidney failure with acute cortical necrosis

ICD-10-CM Codes›N00–N99›N17-N19›N17

ICD-10-CM N17.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N17.1 is a billable ICD-10-CM diagnosis code for acute kidney failure with acute cortical necrosis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 673 through 675, 682 through 684. Coders also document this condition as acute renal cortical necrosis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Acute and unspecified renal failure.

Code Identity

ICD-10-CM Code
N17.1
Billable Status
Yes — Valid for Submission
Code Describes
Acute kidney failure with acute cortical necrosis
Short Description
Acute kidney failure with acute cortical necrosis
Same as the full description in the CMS dataset.
Parent Code
N17
Acute kidney failure

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN17-N19Acute kidney failure and chronic kidney disease
CategoryN17Acute kidney failure
This CodeN17.1Acute kidney failure with acute cortical necrosis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute renal cortical necrosis
  • Acute renal failure due to acute cortical necrosis
  • Renal cortical necrosis

Tabular List NotesGuidance

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

Inclusion Terms

  • Acute cortical necrosis
  • Cortical necrosis NOS
  • Renal cortical necrosis

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.

    • Failure, failed
      • renal
        • acute
          • with
            • cortical necrosis
    • Necrosis, necrotic(ischemic)
      • cortical (acute) (renal)
    • Necrosis, necrotic(ischemic)
      • kidney (bilateral)
        • cortical (acute) (bilateral)

Clinical ClassificationClinical

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

CCSR GEN002
Acute and unspecified renal failure
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Kidney Failure

Healthy kidneys clean your blood by removing excess fluid, minerals, and wastes. They also make hormones that keep your bones strong and your blood healthy. But if the kidneys are damaged, they don't work properly. Harmful wastes can build up in your body. Your blood pressure may rise.

Read the full article at MedlinePlus

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

Convert N17.1 to ICD-9-CMHistory

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

ICD-9-CM
583.6 Renal cort necrosis NOS
Approximate The match is approximate rather than exact.
ICD-9-CM
584.6 Ac kidny fail, cort necr
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 N17.1Overview

Is N17.1 (Acute kidney failure) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report acute kidney failure with acute cortical necrosis on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does N17.1 group to?

When acute kidney failure with acute cortical necrosis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 673, 674, 675, 682, 683, 684, with relative weights from 0.6003 to 4.2016 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of N17.1?

Under the General Equivalence Mappings, acute kidney failure with acute cortical necrosis converts to ICD-9-CM 583.6 (renal cort necrosis NOS) and 584.6 (ac kidny fail, cort necr). 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.