N18 ICD-10-CM Code: Chronic kidney disease (CKD)
N18 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC coding software
HCC Buddy Code Card
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FY 2026 Apr update / Diseases of the genitourinary system (N00-N99) / Acute kidney failure and chronic kidney disease (N17-N19)
N18
Header CodeICD-10-CMOfficial ICD-10-CMCodebook guidanceChronic kidney disease (CKD)
Chronic kidney disease (CKD)
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for N18 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for N18 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for N18 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for N18 in this effective period.
Code First
Official- any associated:
- diabetic chronic kidney disease (E08.22, E09.22, E10.22, E11.22, E13.22)
- hypertensive chronic kidney disease (I12.-, I13.-)
Use Additional
Official- code, if applicable, to identify:
- associated cachexia (E88.A)
- kidney transplant status (Z94.0)
Code Also
OfficialICD-10-CM does not list Code Also instructions for N18 in this effective period.
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
- Code
- N18
- Description
- Chronic kidney disease (CKD)
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- No
- Payment year
- 2026
Coder workflow notes
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What This Code Means
N18 is the ICD-10-CM diagnosis code for chronic kidney disease (ckd). N18 sits in the ICD-10-CM chapter for diseases of the genitourinary system (n00-n99), within the section covering acute kidney failure and chronic kidney disease (n17-n19).
Header codes like N18 cannot be reported on claims directly; they organize child codes that share clinical context. Coders should select the billable child code that matches the documented presentation and then verify its current source-backed HCC mapping. Do not infer a child code or risk adjustment value from the header alone.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for N18 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.