2026 ICD-10-CM Diagnosis Code N18Chronic kidney disease (CKD)

ICD-10-CM Codes›N00–N99›N17-N19›CKD

ICD-10-CM N18
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N18 is a non-billable ICD-10-CM category code for chronic kidney disease (CKD), so it cannot be submitted on claims. Use a more specific code from this category instead, such as N18.1, N18.2, N18.30, and N18.31.

Code Identity

ICD-10-CM Code
N18
Billable Status
No — Non-Billable Category
Code Describes
Chronic kidney disease (CKD)
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
CategoryCKDChronic kidney disease (N18)
This CodeN18Chronic kidney disease (CKD)

Specific Coding for Chronic kidney disease (CKD)Overview

Non-specific codes like N18 require more characters. Use one of these billable codes instead:

  • Use N18.1 for Chronic kidney disease, stage 1

  • Use N18.2 for Chronic kidney disease, stage 2 (mild)

  • N18.3 for Chronic kidney disease, stage 3 (moderate)

  • Use N18.30 for Chronic kidney disease, stage 3 unspecified

  • Use N18.31 for Chronic kidney disease, stage 3a

  • Use N18.32 for Chronic kidney disease, stage 3b

  • Use N18.4 for Chronic kidney disease, stage 4 (severe)

  • Use N18.5 for Chronic kidney disease, stage 5

  • Use N18.6 for End stage renal disease

  • Use N18.9 for Chronic kidney disease, unspecified

Tabular List NotesGuidance

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

Code First

Use Additional Code

  • code, if applicable, to identify:
  • associated cachexia E88.A
  • kidney transplant status Z94.0

Patient EducationClinical

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.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

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 N18Overview

Is N18 (Chronic kidney disease (CKD)) a billable code?

No. This is a category header that groups the codes for chronic kidney disease (CKD), and headers cannot be submitted on claims. Claims for chronic kidney disease (CKD) need a more specific code from this category, such as N18.1, N18.2, and N18.30.