N18.31
✓ Billable
Chronic kidney disease, stage 3a
ICD-10-CM · FY2026 · Diseases of the Genitourinary System
Code
N18.31
System
ICD-10-CM
Billable
Yes — valid for submission
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.
Frequently asked questions
What is ICD-10 code N18.31?
ICD-10-CM code N18.31 represents Chronic kidney disease, stage 3a. It is a billable diagnosis code in the Diseases of the Genitourinary System chapter, effective October 1, 2025 – September 30, 2026.
Is N18.31 billable?
Yes. N18.31 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.
What chapter is N18.31 in?
N18.31 belongs to the Diseases of the Genitourinary System chapter (N00–N99) of ICD-10-CM.
Related codes in the N18 category
N18
Chronic kidney disease (CKD)
Non-billable
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
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