2024 ICD-10-CM Diagnosis Code N18.9

Chronic kidney disease, unspecified

ICD-10-CM Code:
N18.9
ICD-10 Code for:
Chronic kidney disease, unspecified
Is Billable?
Yes - Valid for Submission
Chronic Condition Indicator: [1]
Chronic
Code Navigator:

Code Classification

  • Diseases of the genitourinary system
    (N00–N99)
    • Acute kidney failure and chronic kidney disease
      (N17-N19)
      • Chronic kidney disease (N18)
        (CKD)

N18.9 is a billable diagnosis code used to specify a medical diagnosis of chronic kidney disease, unspecified. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2023 through September 30, 2024.

Unspecified diagnosis codes like N18.9 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

Approximate Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Acquired hypophosphatemia
  • Acute-on-chronic renal failure
  • Anemia in chronic kidney disease
  • Anemia of chronic renal failure
  • Anemia of renal disease
  • Anemia of renal disease
  • Anemia secondary to renal failure
  • Anemia secondary to renal failure
  • Anemia, pre-end stage renal disease on erythropoietin protocol
  • Arteriolar nephrosclerosis
  • Benign arteriolar nephrosclerosis
  • Benign hypertensive heart AND renal disease
  • Benign hypertensive heart disease
  • Benign hypertensive heart disease
  • Benign hypertensive heart disease and chronic renal disease
  • Benign hypertensive renal disease
  • Benign hypertensive renal disease
  • Cardiorenal syndrome
  • Cardiovascular renal disease
  • Chronic disease-related malnutrition
  • Chronic hypertensive uremia
  • Chronic kidney disease
  • Chronic kidney disease due to and following excision of neoplasm of kidney
  • Chronic kidney disease due to benign hypertension
  • Chronic kidney disease due to hypertension
  • Chronic kidney disease due to systemic infection
  • Chronic kidney disease due to traumatic loss of kidney
  • Chronic kidney disease due to type 1 diabetes mellitus
  • Chronic kidney disease due to type 1 diabetes mellitus
  • Chronic kidney disease due to type 2 diabetes mellitus
  • Chronic kidney disease following donor nephrectomy
  • Chronic kidney disease mineral and bone disorder
  • Chronic kidney disease mineral and bone disorder
  • Chronic kidney disease with osteoporosis
  • Chronic renal insufficiency
  • Deficiency of alkaline phosphatase
  • Disorder of vitamin D
  • Erythropoietin resistance in anemia of chronic kidney disease
  • Hypercalcemia due to chronic kidney disease
  • Hyperphosphatemia
  • Hyperphosphatemia due to chronic kidney disease
  • Hypertension complicating pregnancy, childbirth and the puerperium
  • Hypertension complicating pregnancy, childbirth and the puerperium
  • Hypertension in chronic kidney disease due to type 1 diabetes mellitus
  • Hypertension in chronic kidney disease due to type 2 diabetes mellitus
  • Hypertension secondary to renal disease complicating AND/OR reason for care during puerperium
  • Hypertension secondary to renal disease in obstetric context
  • Hypertension secondary to renal disease in obstetric context
  • Hypertensive heart and chronic kidney disease
  • Hypertensive heart AND chronic kidney disease on dialysis
  • Hypertensive heart AND chronic kidney disease with congestive heart failure
  • Hypertensive heart AND renal disease
  • Hypertensive heart AND renal disease complicating AND/OR reason for care during childbirth
  • Hypertensive heart AND renal disease complicating AND/OR reason for care during pregnancy
  • Hypertensive heart AND renal disease in obstetric context
  • Hypertensive heart AND renal disease in obstetric context
  • Hypertensive heart AND renal disease in obstetric context
  • Hypertensive heart and renal disease with heart failure
  • Hypertensive heart and renal disease with heart failure
  • Hypertensive heart disease complicating AND/OR reason for care during childbirth
  • Hypertensive heart disease in obstetric context
  • Hypertensive heart disease in obstetric context
  • Hypertensive heart disease in obstetric context
  • Hypertensive nephrosclerosis
  • Hypertensive renal disease
  • Hypertensive renal disease complicating AND/OR reason for care during childbirth
  • Hypertensive renal disease complicating AND/OR reason for care during childbirth
  • Hypertensive renal disease complicating AND/OR reason for care during pregnancy
  • Hypertensive renal disease in obstetric context
  • Hypertensive renal disease in obstetric context
  • Hypertensive renal disease in obstetric context
  • Hypocalcemia due to chronic kidney disease
  • Hypophosphatemia due to chronic kidney disease
  • Light chain nephropathy
  • Low alkaline phosphatase due to chronic kidney disease
  • Malignant arteriolar nephrosclerosis
  • Malignant hypertensive heart AND renal disease
  • Malignant hypertensive heart disease
  • Malignant hypertensive renal disease
  • Malignant hypertensive renal disease
  • Nephrosclerosis
  • Neuropathy in renal failure
  • Parenchymal renal hypertension
  • Pericarditis secondary to uremia
  • Polyneuropathy due to drug
  • Postoperative renal impairment
  • Postoperative renal impairment
  • Pre-existing hypertensive chronic kidney disease in mother complicating pregnancy
  • Pre-existing hypertensive chronic kidney disease in mother complicating pregnancy
  • Pre-existing hypertensive heart and chronic kidney disease in mother complicating childbirth
  • Pre-existing hypertensive heart and chronic kidney disease in mother complicating pregnancy
  • Pre-existing hypertensive heart and renal disease complicating pregnancy, childbirth and the puerperium
  • Pre-existing hypertensive heart and renal disease complicating pregnancy, childbirth and the puerperium
  • Pre-existing hypertensive heart disease complicating pregnancy, childbirth and the puerperium
  • Pre-existing hypertensive heart disease complicating pregnancy, childbirth and the puerperium
  • Pre-existing hypertensive heart disease in mother complicating childbirth
  • Pre-existing hypertensive heart disease in mother complicating pregnancy
  • Recurrent post-transplant renal disease
  • Renal failure-associated hyperphosphatemia
  • Renal hypertension
  • Renal hypertension complicating pregnancy, childbirth and the puerperium
  • Renal insufficiency
  • Renal involvement in malignant disease
  • Sclerosing glomerulonephritis
  • Serum calcium below reference range
  • Soft tissue calcification due to chronic kidney disease
  • Toxic polyneuropathy
  • Uremic neuropathy
  • Uremic polyneuropathy
  • Vitamin D deficiency
  • Vitamin D deficiency due to chronic kidney disease

Clinical Classification

Clinical Information

  • 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.
  • Nephrosclerosis

    hardening of the kidney due to infiltration by fibrous connective tissue (fibrosis), usually caused by renovascular diseases or chronic hypertension. nephrosclerosis leads to renal ischemia.
  • Vitamin D Deficiency

    a nutritional condition produced by a deficiency of vitamin d in the diet, insufficient production of vitamin d in the skin, inadequate absorption of vitamin d from the diet, or abnormal conversion of vitamin d to its bioactive metabolites. it is manifested clinically as rickets in children and osteomalacia in adults. (from cecil textbook of medicine, 19th ed, p1406)
  • 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)
  • Phosphates

    inorganic salts of phosphoric acid.
  • Chronic Kidney Disease due to Hypertension

    longstanding kidney disease as a complication of hypertension.
  • Uremic Neuropathy

    neuropathy resulting from uremia.
  • 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.
  • Renal Hypertension

    hypertension caused by narrowing or occlusion of the renal arteries.
  • Nutritional Vitamin D Deficiency Rickets

    nutritional rickets due to dietary deficiency of vitamin d.
  • Vitamin D Deficiency

    abnormally low level of 25-hydroxyvitamin d in the blood.
  • Cardiorenal Syndrome

    a disorder of the heart and kidneys in which dysfunction of one of the organs induces dysfunction of the other organ.
  • Toxic Polyneuropathy

    polyneuropathy that is caused by exposure to toxins.

Tabular List of Diseases and Injuries

The following annotation back-references are applicable to this diagnosis code. The Tabular List of Diseases and Injuries is a list of ICD-10-CM codes, organized "head to toe" into chapters and sections with coding notes and guidance for inclusions, exclusions, descriptions and more.


Inclusion Terms

Inclusion Terms
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.
  • Chronic renal disease
  • Chronic renal failure NOS
  • Chronic renal insufficiency
  • Chronic uremia NOS
  • Diffuse sclerosing glomerulonephritis NOS

Index to Diseases and Injuries References

The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).

Convert N18.9 to ICD-9-CM

  • ICD-9-CM Code: 585.9 - Chronic kidney dis NOS

Patient Education


Chronic Kidney Disease

You have two kidneys, each about the size of your fist. Their main job is to filter your blood. They remove wastes and extra water, which become urine. They also keep the body's chemicals balanced, help control blood pressure, and make hormones.

Chronic kidney disease (CKD) means that your kidneys are damaged and can't filter blood as they should. This damage can cause wastes to build up in your body. It can also cause other problems that can harm your health. Diabetes and high blood pressure are the most common causes of CKD.

The kidney damage occurs slowly over many years. Many people don't have any symptoms until their kidney disease is very advanced. Blood and urine tests are the only way to know if you have kidney disease.

Treatments cannot cure kidney disease, but they may slow kidney disease. They include medicines to lower blood pressure, control blood sugar, and lower cholesterol. CKD may still get worse over time. Sometimes it can lead to kidney failure. If your kidneys fail, you will need dialysis or a kidney transplantation.

You can take steps to keep your kidneys healthier longer:

  • Choose foods with less salt (sodium)
  • Control your blood pressure; your health care provider can tell you what your blood pressure should be
  • Keep your blood sugar in the target range, if you have diabetes
  • Limit the amount of alcohol you drink
  • Choose foods that are healthy for your heart: fruits, vegetables, whole grains, and low-fat dairy foods
  • Lose weight if you are overweight
  • Be physically active
  • Don't smoke

NIH: National Institute of Diabetes and Digestive and Kidney Diseases


[Learn More in MedlinePlus]

Diet & Nutrition for Adults with Advanced Chronic Kidney Disease

Learn about nutrition for adults with advanced CKD: medical nutrition therapy, calories, protein, fat, sodium, potassium, phosphorus, and liquid intake.
[Learn More in MedlinePlus]

Helping Your Child Adapt to Life with Chronic Kidney Disease

Overview of ways in which parents and other adults can help children with kidney disease overcome the daily challenges of living with a chronic illness.
[Learn More in MedlinePlus]

Mineral & Bone Disorder in Chronic Kidney Disease

Mineral and bone disorder in chronic kidney disease occurs when damaged kidneys and abnormal hormone levels cause blood calcium and phosphorus imbalances.
[Learn More in MedlinePlus]

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016. This was the first year ICD-10-CM was implemented into the HIPAA code set.

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.