2027 ICD-10-CM Diagnosis Code N28.9Disorder of kidney and ureter, unspecified

ICD-10-CM Codes›N00–N99›N25-N29›N28

ICD-10-CM N28.9
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

N28.9 is a billable ICD-10-CM diagnosis code for disorder of kidney and ureter, unspecified. 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. 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
N28.9
Billable Status
Yes — Valid for Submission
Code Describes
Disorder of kidney and ureter, unspecified
Short Description
Disorder of kidney and ureter, unspecified
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 CodeN28.9Disorder of kidney and ureter, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abnormal blue sclerae
  • Acquired immune deficiency syndrome-related nephropathy
  • Acute nephropathy
  • Acute renal impairment
  • Acute renal insufficiency
  • Anasarca
  • Anemia of renal disease
  • Arthrogryposis with renal dysfunction and cholestasis syndrome
  • Atherosclerosis, deafness, diabetes, epilepsy, nephropathy syndrome
  • Azotemia
  • Azotemia due to intrarenal disease
  • Chronic gout of ankle without tophus due to renal impairment
  • Chronic gout of elbow without tophus due to renal impairment
  • Chronic gout of hand without tophus due to renal impairment
  • Chronic gout of hip without tophus due to renal impairment
  • Chronic gout of knee without tophus due to renal impairment
  • Chronic gout of multiple sites without tophus due to renal impairment
  • Chronic gout of shoulder without tophus due to renal impairment
  • Chronic gout of vertebra without tophus due to renal impairment
  • Chronic gout of wrist without tophus due to renal impairment
  • Chronic gout without tophus due to renal impairment
  • Chronic gouty arthritis
  • Chronic gouty nephropathy
  • Chronic tophaceous gout due to renal impairment
  • Chronic tophaceous gout of ankle
  • Chronic tophaceous gout of ankle due to renal impairment
  • Chronic tophaceous gout of elbow due to renal impairment
  • Chronic tophaceous gout of hand
  • Chronic tophaceous gout of hand due to renal impairment
  • Chronic tophaceous gout of hip due to renal impairment
  • Chronic tophaceous gout of knee due to renal impairment
  • Chronic tophaceous gout of left wrist due to renal impairment
  • Chronic tophaceous gout of multiple sites due to renal impairment
  • Chronic tophaceous gout of right wrist due to renal impairment
  • Chronic tophaceous gout of shoulder due to renal impairment
  • Chronic tophaceous gout of vertebra due to renal impairment
  • Chronic tophaceous gout of wrist due to renal impairment
  • Cochlear nerve disorder
  • Congenital anomaly of sclera
  • Crystal arthropathy of wrist
  • Deteriorating renal function
  • Disorder of kidney and/or ureter
  • Disorder of kidney co-occurrent with human immunodeficiency virus infection
  • Disorder of kidney due to kappa light chain disease
  • Disorder of renal parenchyma
  • Disorder of ureter
  • Epiphyseal arrest due to kidney disease
  • Escape of urine from kidney
  • Escape of urine from ureter
  • Extravasation of urine
  • Extravasation of urine from kidney
  • Extravasation of urine from renal pelvis
  • Extravasation of urine from ureter
  • Fetal disorder due to maternal renal disease
  • Gout of elbow due to renal impairment
  • Gout of hand due to renal impairment
  • Gout of hip due to renal impairment
  • Gout of knee due to renal impairment
  • Gout of multiple sites due to renal impairment
  • Gout of shoulder due to renal impairment
  • Gout of vertebra due to renal impairment
  • Gout of wrist due to renal impairment
  • Gouty arthritis of left radiocarpal joint
  • Gouty arthritis of left wrist
  • Gouty arthritis of radiocarpal joint
  • Gouty arthritis of right radiocarpal joint
  • Gouty arthritis of right wrist
  • Gouty arthritis of wrist
  • Hydrocephalus, blue sclera, nephropathy syndrome
  • Hypocalciuria
  • Inherited disorder of bilirubin metabolism
  • Kidney disease
  • Kidney lesion
  • Lesion of ureter
  • Neonatal renal disorder
  • Neonatal renal impairment
  • Nephropathy due to acquired urinary tract obstruction
  • Nephropathy following eclampsia
  • Nephropathy following pre-eclampsia
  • Neural hearing loss
  • Neurogenic arthrogryposis multiplex congenita
  • Photomyoclonus, diabetes mellitus, deafness, nephropathy and cerebral dysfunction
  • Postoperative renal impairment
  • Renal complication of procedure
  • Renal function impairment with growth failure
  • Renal hypocalciuria
  • Renal impairment
  • Renal insufficiency
  • Renal retinopathy
  • Sequela following seizure
  • TAFRO syndrome
  • Urate nephropathy
  • Viral kidney infection
  • Visceral gout

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to N28.9: 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.

  • Nephropathy NOS
  • Renal disease (acute) NOS
  • Renal insufficiency (acute)

Excludes1

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

  • chronic renal insufficiency (N18.9)
  • unspecified nephritic syndrome (N05.-)

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 N28.9, its category, or a range that includes it.

Excludes1 3

These codes carry an Excludes1 note naming N28.9: they are not reported together with it, unless the two conditions are unrelated.

  • N05 Unspecified nephritic syndrome
    nephropathy NOS with no stated morphological lesion (N28.9)
  • N05 Unspecified nephritic syndrome
    renal disease NOS with no stated morphological lesion (N28.9)
  • N19 Unspecified kidney failure
    renal insufficiency (acute) (N28.9)

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 N28.9 to ICD-9-CMHistory

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

ICD-9-CM
593.9 Renal & ureteral dis NOS
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 N28.9Overview

What is the ICD-10 code for disorder of kidney and ureter, unspecified?

The ICD-10-CM code for disorder of kidney and ureter, unspecified is N28.9 (sometimes written as N289). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is N28.9 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report disorder of kidney and ureter, unspecified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does N28.9 group to?

When disorder of kidney and ureter, unspecified 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.

Can N28.9 be reported with N18.9?

Not as a rule. The Excludes1 note on N28.9 lists "chronic renal insufficiency (N18.9)". 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).

What is the ICD-9 equivalent of N28.9?

Under the General Equivalence Mappings, disorder of kidney and ureter, unspecified converts to ICD-9-CM 593.9 (renal & ureteral dis NOS). The mapping is approximate, so confirm the match fits the documentation.