2026 ICD-10-CM Diagnosis Code N28.9Disorder of kidney and ureter, unspecified
ICD-10-CM Codes›N00–N99›N25-N29›N28
- Billable — Valid for Submission
- Not Chronic
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 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 Other specified and unspecified diseases of kidney and ureters.
Code Identity
Code Classification
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 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
- Congenital anomaly of sclera
- Crystal arthropathy of wrist
- Deteriorating renal function
- Diabetes mellitus associated with genetic syndrome
- 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
- Nephropathy due to acquired urinary tract obstruction
- Nephropathy following eclampsia
- Nephropathy following pre-eclampsia
- Neural hearing loss
- Neurogenic arthrogryposis multiplex congenita
- Newborn renal dysfunction
- 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
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Inclusion Terms
- Nephropathy NOS
- Renal disease (acute) NOS
- Renal insufficiency (acute)
Type 1 Excludes
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
- kidney - N28.9
- Complication (s) (from) (of)
- renal - N28.9
- salt or sodium - E87.1
- nephropathy - N28.9
- Disease, diseased - See Also: Syndrome;
- kidney (functional) (pelvis) - N28.9
- renal (functional) (pelvis) - See Also: Disease, kidney; - N28.9
- acute - N28.9
- ureter - N28.9
- Disorder (of) - See Also: Disease;
- kidney - N28.9
- ureter (in) - N28.9
- Impaired, impairment (function)
- kidney - N28.9
- renal (acute) (chronic) - N28.9
- Inefficiency, kidney - N28.9
- kidney - N28.9
- acute - N28.9
- renal (acute) - N28.9
- Nephropathy - See Also: Nephritis; - N28.9
- kidney - N28.9
- Shutdown, renal - N28.9
- renal - N28.9
External Cause of Injuries IndexGuidance
References for this code in the External Cause of Injuries Index.
- Block, blocked
- kidney
- Cachexia
- renal
- Complication(s) (from) (of)
- renal
- Depletion
- salt or sodium
- nephropathy
- Disease, diseased
- kidney (functional) (pelvis)
- Disease, diseased
- renal (functional) (pelvis)
- Disease, diseased
- renal (functional) (pelvis)
- acute
- Disease, diseased
- ureter
- Disorder(of)
- kidney
- Disorder(of)
- ureter (in)
- Impaired, impairment(function)
- kidney
- Impaired, impairment(function)
- renal (acute) (chronic)
- Inefficiency, kidney
- Insufficiency, insufficient
- kidney
- Insufficiency, insufficient
- kidney
- acute
- Insufficiency, insufficient
- renal (acute)
- Low
- function
- kidney
- Nephropathy
- Nonfunctioning
- kidney
- Shutdown, renal
- Suppression
- renal
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Azotemia
a biochemical abnormality referring to an elevation of blood urea nitrogen and creatinine. azotemia can be produced by kidney diseases or other extrarenal disorders. when azotemia becomes associated with a constellation of clinical signs, it is termed uremia.Acute Kidney Injury
abrupt reduction in kidney function. acute kidney injury encompasses the entire spectrum of the syndrome including acute kidney failure; acute kidney tubular necrosis; and other less severe conditions.Renal Insufficiency
conditions in which the kidneys perform below the normal level in the ability to remove wastes, concentrate urine, and maintain electrolyte balance; blood pressure; and calcium metabolism. renal insufficiency can be classified by the degree of kidney damage (as measured by the level of proteinuria) and reduction in glomerular filtration rate.Renal Insufficiency, Chronic
conditions in which the kidneys perform below the normal level for more than three months. chronic kidney insufficiency is classified by five stages according to the decline in glomerular filtration rate and the degree of kidney damage (as measured by the level of proteinuria). the most severe form is the end-stage renal disease (chronic kidney failure). (kidney foundation: kidney disease outcome quality initiative, 2002)Anasarca
a condition that is characterized by the presence of generalized edema. causes include congestive heart failure, liver failure, renal failure, and severe malnutrition.
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.
Code HistoryHistory
Questions About N28.9Overview
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, 2025 through September 30, 2026.
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 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 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.
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.
