2026 ICD-10-CM Diagnosis Code N17.8Other acute kidney failure

ICD-10-CM Codes›N00–N99›N17-N19›N17

ICD-10-CM N17.8
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N17.8 is a billable ICD-10-CM diagnosis code for other acute kidney failure. 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, 791, 793. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 267 closely related codes. Coders also document this condition as acute renal failure due to ischemia. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Acute and unspecified renal failure.

N17.8 no longer risk-adjusts for Medicare Advantage: it mapped to HCC 135 under the retired CMS-HCC V24 model through payment year 2025 but maps to no category in the live V28 model. It still risk-adjusts in the PACE (CMS-HCC V22) category 135, ESRD (V21) category 135, and ESRD (V24) category 135 for payment year 2026.

Code Identity

ICD-10-CM Code
N17.8
Billable Status
Yes — Valid for Submission
Code Describes
Other acute kidney failure
Short Description
Other acute kidney failure
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 CodeN17.8Other acute kidney failure

Medicare Risk Adjustment (HCC)Billing

N17.8 no longer risk-adjusts for Medicare Advantage: it maps to no payment category in the live CMS-HCC V28 model, although it still risk-adjusts in the other CMS models shown below.

CMS-HCC V28 (Medicare Advantage Payment Model)
Not mapped
Dropped in V28 see all codes that no longer risk-adjust
Prior Model (CMS-HCC V24)
HCC 135
V24 retired last contributed to a Medicare Advantage risk score in payment year 2025
Other CMS Models
PACE (CMS-HCC V22): HCC 135 · ESRD (V21): HCC 135 · ESRD (V24): HCC 135
ESRD V21 weights: 0.000 dialysis, 0.000 functioning graft · ESRD V24 weights: 0.000 dialysis, 0.000 functioning graft
Part D (RxHCC)
Not mapped
N17.8 does not risk-adjust in the RxHCC prescription drug model

Source: CMS Payment Year 2026 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute renal failure due to ischemia
  • Ischemic nephropathy
  • Post-renal renal failure

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

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

Clinical InformationClinical

  • Ischemic Nephropathy

    nephropathy due to hypoperfusion of the kidney.

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 N17.8 to ICD-9-CMHistory

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

ICD-9-CM
584.8 Acute kidney failure NEC
Exact Match The mapping is direct, with no qualifiers.

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 N17.8Overview

What is the ICD-10 code for other acute kidney failure?

The ICD-10-CM code for other acute kidney failure is N17.8 (sometimes written as N178). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is N17.8 (Acute kidney failure) a billable code?

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

What MS-DRG does N17.8 group to?

When other acute kidney failure is the principal diagnosis on an inpatient stay, it groups to MS-DRG 673, 674, 675, 682, 683, 684, 791, 793, with relative weights from 0.6003 to 4.2016 depending on complications. Higher weights mean higher Medicare reimbursement.

Is N17.8 a CC or MCC?

CMS lists N17.8 as a CC (complication or comorbidity) for FY 2026. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 267 closely related codes in its exclusion list.

What is the ICD-9 equivalent of N17.8?

Under the General Equivalence Mappings, other acute kidney failure converts to ICD-9-CM 584.8 (acute kidney failure NEC). The mapping is a direct match.

Does N17.8 risk-adjust for Medicare Advantage payment?

Not for Medicare Advantage. N17.8 mapped to HCC 135 in the retired CMS-HCC V24 model, which last determined payment in 2025, but it maps to no category in the live V28 model; see all codes that no longer risk-adjust. It still risk-adjusts in the PACE (CMS-HCC V22) category 135 (Acute Renal Failure), ESRD (V21) category 135 (Acute Renal Failure), and ESRD (V24) category 135 (Acute Renal Failure).