N18 — Chronic kidney disease (CKD)
N18 is a non-billable header ICD-10-CM code for chronic kidney disease (ckd). It cannot be billed on its own: choose one of the more specific child codes below.
Code first
The underlying condition must be sequenced before this code.
Use additional code
Add a secondary code to capture the detail described below.
Other codes that can never be billed with N18
These codes carry an Excludes1 note pointing at N18. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading N18 alone.
Risk adjustment
N18 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
The condition this code belongs to
Every code for the condition on one page, which one applies when, and the mistake coders make with it.
Code history
N18 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Code to one of these instead N18
7 child codes. Green means billable.
Questions about N18
- Is N18 a billable ICD-10-CM code?
- No. N18 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does N18 sit in the tabular list?
- Diseases of the genitourinary system (N00-N99), in the block Acute kidney failure and chronic kidney disease (N17-N19).