2026 ICD-10-CM Diagnosis Code N99.0Postprocedural (acute) (chronic) kidney failure

ICD-10-CM Codes›N00–N99›N99›N99

ICD-10-CM N99.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N99.0 is a billable ICD-10-CM diagnosis code for postprocedural (acute) (chronic) kidney failure. 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 Acute and unspecified renal failure and Postprocedural or postoperative genitourinary system complication.

Code Identity

ICD-10-CM Code
N99.0
Billable Status
Yes — Valid for Submission
Code Describes
Postprocedural (acute) (chronic) kidney failure
Short Description
Postprocedural (acute) (chronic) kidney failure
Same as the full description in the CMS dataset.
Parent Code
N99
Intraoperative and postprocedural complications and disorders of genitourinary system, not elsewhere classified

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN99Intraoperative and postprocedural complications and disorders of genitourinary system, not elsewhere classified
CategoryN99Intraoperative and postprocedural complications and disorders of genitourinary system, not elsewhere classified
This CodeN99.0Postprocedural (acute) (chronic) kidney failure

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute kidney injury following administration of contrast media
  • Acute postoperative renal failure
  • Acute renal cortical necrosis
  • Acute renal failure due to procedure
  • Acute tubular necrosis
  • Anuria
  • Anuria following procedure
  • Oliguria
  • Oliguria following procedure
  • Postoperative acute tubular necrosis
  • Postoperative renal failure
  • Postoperative renal impairment
  • Postprocedural acute renal failure

Tabular List NotesGuidance

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

Use Additional Code

  • code to type of kidney disease

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.

    • Anuria
      • postprocedural
    • Block, blocked
      • kidney
        • postcystoscopic or postprocedural
    • Complication(s) (from) (of)
      • genitourinary
        • postprocedural
          • renal failure
    • Failure, failed
      • renal
        • postprocedural
    • Necrosis, necrotic(ischemic)
      • tubular (acute) (anoxic) (renal) (toxic)
        • postprocedural
    • Nephrosis, nephrotic(Epstein's) (syndrome) (congenital)
      • tubular (acute)
        • postprocedural
    • Oliguria
      • postprocedural

Clinical ClassificationClinical

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

CCSR GEN002
Acute and unspecified renal failure
Default principal diagnosis: inpatient No · outpatient No
CCSR GEN026
Postprocedural or postoperative genitourinary system complication
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Anuria

    absence of urine formation. it is usually associated with complete bilateral ureteral (ureter) obstruction, complete lower urinary tract obstruction, or unilateral ureteral obstruction when a solitary kidney is present.

  • Oliguria

    decreased urine output that is below the normal range. oliguria can be defined as urine output of less than or equal to 0.5 or 1 ml/kg/hr depending on the age.

  • Ureter

    one of a pair of thick-walled tubes that transports urine from the kidney pelvis to the urinary bladder.

  • Urine

    liquid by-product of excretion produced in the kidneys, temporarily stored in the bladder until discharge through the urethra.

  • Melanuria

    an indication of dark brown or black urine discoloration due to the presence of melanin or its precursors.

  • Anuria

    absence of urine output.

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 N99.0 to ICD-9-CMHistory

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

ICD-9-CM
997.5 Surg compl-urinary tract
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 N99.0Overview

Is N99.0 a billable code?

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

What MS-DRG does N99.0 group to?

When postprocedural (acute) (chronic) kidney failure 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 N99.0?

Under the General Equivalence Mappings, postprocedural (acute) (chronic) kidney failure converts to ICD-9-CM 997.5 (surg compl-urinary tract). 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.