2026 ICD-10-CM Diagnosis Code N19Unspecified kidney failure

ICD-10-CM Codes›N00–N99›N17-N19›N19

ICD-10-CM N19
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N19 is a billable ICD-10-CM diagnosis code for unspecified 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Acute and unspecified renal failure.

Code Identity

ICD-10-CM Code
N19
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified kidney failure
Chapter
N17-N19
Acute kidney failure and chronic kidney disease

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN17-N19Acute kidney failure and chronic kidney disease
CategoryN19Unspecified kidney failure
This CodeN19Unspecified kidney failure

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Absent renal function
  • Acquired platelet function disorder
  • Action myoclonus renal failure syndrome
  • Acute pericarditis secondary to uremia
  • Anemia of renal disease
  • Anemia secondary to renal failure
  • Benign hypertensive renal disease
  • Benign hypertensive renal disease with renal failure
  • Blood urate above reference range
  • Blood urate outside reference range
  • Calcific arteriolopathy due to uremia
  • Calciphylaxis
  • Chronic progressive renal failure
  • Chronic renal failure
  • Dementia due to renal failure
  • Dent's disease
  • Dependence on prolonged intermittent renal replacement therapy due to renal failure
  • Dependence on renal dialysis
  • Disorder of kidney co-occurrent with human immunodeficiency virus infection
  • Glomerular disease due to action myoclonus renal failure syndrome
  • Hyperphosphatemia
  • Hypertensive renal failure
  • Hyperuricemia
  • Hyperuricemia, anemia, renal failure syndrome
  • Hyperuricemia, pulmonary hypertension, renal failure, alkalosis syndrome
  • Myoclonic disorder due to uremia
  • Neuropathy in renal failure
  • Non-functioning kidney
  • Pericarditis secondary to uremia
  • Platelet dysfunction associated with uremia
  • Renal failure associated with renal vascular disease
  • Renal failure syndrome
  • Renal failure syndrome co-occurrent with human immunodeficiency virus infection
  • Renal failure-associated hyperphosphatemia
  • Restless leg syndrome due to uremia
  • Restless legs syndrome
  • Secondary restless legs syndrome
  • Sleep related movement disorder
  • Urate nephropathy
  • Uremia
  • Uremia due to inadequate renal perfusion
  • Uremia in pregnancy without hypertension
  • Uremic coma
  • Uremic convulsion
  • Uremic encephalopathy
  • Uremic gastritis
  • X-linked recessive nephrolithiasis with renal failure

Tabular List NotesGuidance

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

Inclusion Terms

  • Uremia NOS

Type 1 Excludes

  • acute kidney failure N17
  • chronic kidney disease N18
  • chronic uremia N18.9
  • extrarenal uremia R39.2
  • prerenal uremia R39.2
  • renal insufficiency acute N28.9
  • uremia of newborn P96.0

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.

    • Azotemia
      • meaning uremia
    • Failure, failed
      • kidney
    • Failure, failed
      • renal
    • Stasis
      • kidney
    • Stasis
      • renal
    • Uremia, uremic

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

  • Hyperphosphatemia

    a condition of abnormally high level of phosphates in the blood, usually significantly above the normal range of 0.84-1.58 mmol per liter of serum.

  • Calciphylaxis

    condition of induced systemic hypersensitivity in which tissues respond to appropriate challenging agents with a sudden local calcification.

  • Restless Legs Syndrome

    a disorder characterized by aching or burning sensations in the lower and rarely the upper extremities that occur prior to sleep or may awaken the patient from sleep.

  • Hyperuricemia

    excessive uric acid or urate in blood as defined by its solubility in plasma at 37 degrees c; greater than 0.42mmol per liter (7.0mg/dl) in men or 0.36mmol per liter (6.0mg/dl) in women. this condition is caused by overproduction of uric acid or impaired renal clearance. hyperuricemia can be acquired, drug-induced or genetically determined (lesch-nyhan syndrome). it is associated with hypertension and gout.

  • Lesch-Nyhan Syndrome

    an inherited disorder transmitted as a sex-linked trait and caused by a deficiency of an enzyme of purine metabolism; hypoxanthine phosphoribosyltransferase. affected individuals are normal in the first year of life and then develop psychomotor retardation, extrapyramidal movement disorders, progressive spasticity, and seizures. self-destructive behaviors such as biting of fingers and lips are seen frequently. intellectual impairment may also occur but is typically not severe. elevation of uric acid in the serum leads to the development of renal calculi and gouty arthritis. (menkes, textbook of child neurology, 5th ed, pp127)

  • Uremia

    a clinical syndrome associated with the retention of renal waste products or uremic toxins in the blood. it is usually the result of renal insufficiency. most uremic toxins are end products of protein or nitrogen catabolism, such as urea or creatinine. severe uremia can lead to multiple organ dysfunctions with a constellation of symptoms.

  • Uremic Toxins

    biological solutes retained and accumulated due to kidney impairment that contribute to uremia/chronic kidney disease.

  • Phosphates

    inorganic salts of phosphoric acid.

  • Hypoxanthine Phosphoribosyltransferase

    an enzyme that catalyzes the conversion of 5-phosphoribosyl-1-pyrophosphate and hypoxanthine, guanine, or mercaptopurine to the corresponding 5'-mononucleotides and pyrophosphate. the enzyme is important in purine biosynthesis as well as central nervous system functions. complete lack of enzyme activity is associated with the lesch-nyhan syndrome, while partial deficiency results in overproduction of uric acid. ec 2.4.2.8.

  • Grade 1 Hyperphosphatemia, CTCAE|Grade 1 Hyperphosphatemia

    laboratory finding only and intervention not indicated

  • Grade 2 Hyperphosphatemia, CTCAE|Grade 2 Hyperphosphatemia

    noninvasive intervention indicated

  • Grade 3 Hyperphosphatemia, CTCAE|Grade 3 Hyperphosphatemia

    severe or medically significant but not immediately life-threatening; hospitalization or prolongation of existing hospitalization indicated

  • Grade 4 Hyperphosphatemia, CTCAE|Grade 4 Hyperphosphatemia

    life-threatening consequences; urgent intervention indicated (e.g., dialysis)

  • Grade 5 Hyperphosphatemia, CTCAE|Grade 5 Hyperphosphatemia

    death

  • Hyperphosphatemia

    abnormally high level of phosphate in the blood.

  • Hyperphosphatemia, CTCAE|Hyperphosphatemia

    a disorder characterized by laboratory test results that indicate an elevation in the concentration of phosphate in a blood.

  • Calciphylaxis

    a rare syndrome characterized by vascular calcification and skin necrosis. it seen in patients with end stage renal disease.

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 N19 to ICD-9-CMHistory

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

ICD-9-CM
586 Renal failure NOS
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 N19Overview

Is N19 (Unspecified kidney failure) a billable code?

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

What MS-DRG does N19 group to?

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

What is the ICD-9 equivalent of N19?

Under the General Equivalence Mappings, unspecified kidney failure converts to ICD-9-CM 586 (renal failure NOS). The mapping is a direct match.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.