2022 ICD-10-CM Code N18.4

Chronic kidney disease, stage 4 (severe)

Version 2021

Valid for Submission

ICD-10:N18.4
Short Description:Chronic kidney disease, stage 4 (severe)
Long Description:Chronic kidney disease, stage 4 (severe)

Code Classification

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

N18.4 is a billable diagnosis code used to specify a medical diagnosis of chronic kidney disease, stage 4 (severe). The code N18.4 is valid during the fiscal year 2022 from October 01, 2021 through September 30, 2022 for the submission of HIPAA-covered transactions.

The ICD-10-CM code N18.4 might also be used to specify conditions or terms like anemia in chronic kidney disease stage 4, benign hypertensive heart disease, benign hypertensive heart disease and chronic renal disease, benign hypertensive heart disease and chronic renal disease stage 4, chronic kidney disease due to benign hypertension , chronic kidney disease due to type 1 diabetes mellitus, etc.

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code N18.4 are found in the index:

Approximate Synonyms

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

Convert N18.4 to ICD-9 Code

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:

NIH: National Institute of Diabetes and Digestive and Kidney Diseases


[Learn More in MedlinePlus]

Chronic Kidney Disease (CKD) Overview of chronic kidney disease (CKD), including definition, causes, tests and diagnosis, managing CKD, eating right with CKD, and preventing CKD.
[Learn More in MedlinePlus]

Code History

  • 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 (First year ICD-10-CM implemented into the HIPAA code set)