2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 698 through 700. 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 10 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified diseases of kidney and ureters.

N28.0 no longer risk-adjusts for Medicare Advantage: it mapped to HCC 107 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 107, ESRD (V21) category 107, and ESRD (V24) category 107 for payment year 2027.

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

Medicare Risk Adjustment (HCC)Billing

N28.0 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 107
V24 retired last contributed to a Medicare Advantage risk score in payment year 2025
Other CMS Models
PACE (CMS-HCC V22): HCC 107 · ESRD (V21): HCC 107 · ESRD (V24): HCC 107
ESRD V21 weights: 0.126 dialysis, 0.300–0.431 functioning graft · ESRD V24 weights: 0.144 dialysis, 0.324–0.586 functioning graft
Part D (RxHCC)
Not mapped
N28.0 does not risk-adjust in the RxHCC prescription drug model

Source: CMS Payment Year 2027 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 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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to N28.0: its own notes plus those printed at block N25-N29 and Chapter 14. A note printed at a category, block or chapter applies to every code under it.

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

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

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

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

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Block N25-N29 Other disorders of kidney and ureter applies to 22 codes
  • disorders of kidney and ureter with urolithiasis (N20-N23)
From Chapter 14 (N00-N99) Diseases of the genitourinary system applies to 838 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name N28.0, its category, or a range that includes it.

Excludes2 1

These codes carry an Excludes2 note naming N28.0: its condition is not part of those codes, and both may be reported when the patient has both.

  • I74 Arterial embolism and thrombosis
    renal embolism and thrombosis (N28.0)

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

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About N28.0Overview

What is the ICD-10 code for ischemia and infarction of kidney?

The ICD-10-CM code for ischemia and infarction of kidney is N28.0 (sometimes written as N280). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

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 699, 698, 700, with relative weights from 0.6740 to 1.6400 depending on complications. Higher weights mean higher Medicare reimbursement.

Is N28.0 a CC or MCC?

CMS lists N28.0 as a CC (complication or comorbidity) for FY 2027. 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 10 closely related codes in its exclusion list.

Can N28.0 be reported with I70.1?

Not as a rule. The Excludes1 note on N28.0 lists "atherosclerosis of renal artery (extrarenal part) (I70.1)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).

Does N28.0 risk-adjust for Medicare Advantage payment?

Not for Medicare Advantage. N28.0 mapped to HCC 107 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 107 (Vascular Disease with Complications), ESRD (V21) category 107 (Vascular Disease with Complications), and ESRD (V24) category 107 (Vascular Disease with Complications).