N18
⚠ Non-billable
Chronic kidney disease (CKD)
ICD-10-CM · FY2026 · Diseases of the Genitourinary System
Code
N18
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Diseases of the Genitourinary System
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Official coding notes
From CMS's ICD-10-CM Tabular List.
Code first
- any associated:
- diabetic chronic kidney disease (E08.22, E09.22, E10.22, E11.22, E13.22)
- hypertensive chronic kidney disease (I12.-, I13.-)
Use additional code
- code, if applicable, to identify:
- associated cachexia (E88.A)
- kidney transplant status (Z94.0)
Frequently asked questions
What is ICD-10 code N18?
ICD-10-CM code N18 represents Chronic kidney disease (CKD). It is a non-billable header code requiring a more specific subcategory in the Diseases of the Genitourinary System chapter, effective October 1, 2025 – September 30, 2026.
Is N18 billable?
No. N18 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is N18 in?
N18 belongs to the Diseases of the Genitourinary System chapter (N00–N99) of ICD-10-CM.
Related codes in the N18 category
N18.1
Chronic kidney disease, stage 1
Billable
N18.2
Chronic kidney disease, stage 2 (mild)
Billable
N18.3
Chronic kidney disease, stage 3 (moderate)
Non-billable
N18.4
Chronic kidney disease, stage 4 (severe)
Billable
N18.5
Chronic kidney disease, stage 5
Billable
N18.6
End stage renal disease
Billable
N18.9
Chronic kidney disease, unspecified
Billable
N18.30
Chronic kidney disease, stage 3 unspecified
Billable
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