ICD-10-CM Code N18

Chronic kidney disease (CKD)

Version 2020 Non-Billable Code

Not Valid for Submission

N18 is a "header" nonspecific and non-billable code code, consider using a code with a higher level of specificity for a diagnosis of chronic kidney disease (ckd). The code is NOT valid for the year 2020 for the submission of HIPAA-covered transactions.

Short Description:Chronic kidney disease (CKD)
Long Description:Chronic kidney disease (CKD)

Consider the following ICD-10 codes with a higher level of specificity:

  • N18.1 - Chronic kidney disease, stage 1
  • N18.2 - Chronic kidney disease, stage 2 (mild)
  • N18.3 - Chronic kidney disease, stage 3 (moderate)
  • N18.4 - Chronic kidney disease, stage 4 (severe)
  • N18.5 - Chronic kidney disease, stage 5
  • N18.6 - End stage renal disease
  • N18.9 - Chronic kidney disease, unspecified

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code N18:

Code First

Code First
Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition be sequenced first followed by the manifestation. Wherever such a combination exists, there is a "use additional code" note at the etiology code, and a "code first" note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation.

Use Additional Code

Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
  • code to identify kidney transplant status, if applicable, Z94.0

Clinical Information

  • CHRONIC KIDNEY DISEASE MINERAL AND BONE DISORDER-. decalcification of bone or abnormal bone development due to chronic kidney diseases in which 125 dihydroxyvitamin d3 synthesis by the kidneys is impaired leading to reduced negative feedback on parathyroid hormone. the resulting secondary hyperparathyroidism eventually leads to bone disorders.
  • 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

Code Classification

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

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020

Information for Patients

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

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