N18Header code — not billable
Chronic kidney disease (CKD)
- Chapter
- 14. Diseases of the genitourinary system
- Category
- N18
- Effective date
- October 1, 2026
Related codes in category N18
N18.1Chronic kidney disease, stage 1YesN18.2Chronic kidney disease, stage 2 (mild)YesN18.3Chronic kidney disease, stage 3 (moderate)N18.30Chronic kidney disease, stage 3 unspecifiedYesN18.31Chronic kidney disease, stage 3aYesN18.32Chronic kidney disease, stage 3bYesN18.4Chronic kidney disease, stage 4 (severe)YesN18.5Chronic kidney disease, stage 5YesN18.6End stage renal diseaseYesN18.9Chronic kidney disease, unspecifiedYes
Frequently asked questions
What is ICD-10 code N18?
N18 is an ICD-10-CM diagnosis code for Chronic kidney disease (CKD).
Is N18 a billable code?
No. N18 is a category/header code, not billable on its own — use one of its more specific child codes instead.
What ICD-10-CM chapter is N18 in?
N18 falls under Chapter 14: Diseases of the genitourinary system.
When did N18 become effective?
N18 has been effective since October 1, 2026, per the CMS/CDC ICD-10-CM annual release.
What other codes are related to N18?
N18 belongs to category N18, which includes 10 other codes — see the related codes list on this page.
ICD-10-CM data maintained by CDC/CMS (public domain). Always verify codes with authoritative sources before making coding or billing decisions.