N18: Chronic kidney disease (CKD)
Codes under N18 (Chronic kidney disease (CKD)). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| N18.1 | Chronic kidney disease, stage 1 | ✓ |
| N18.1 | Chronic kidney disease, stage 1 | ✓ |
| N18.2 | Chronic kidney disease, stage 2 (mild) | ✓ |
| N18.2 | Chronic kidney disease, stage 2 (mild) | ✓ |
| N18.3 | Chronic kidney disease, stage 3 (moderate) | — |
| N18.3 | Chronic kidney disease, stage 3 (moderate) | — |
| N18.4 | Chronic kidney disease, stage 4 (severe) | ✓ |
| N18.4 | Chronic kidney disease, stage 4 (severe) | ✓ |
| N18.5 | Chronic kidney disease, stage 5 | ✓ |
| N18.5 | Chronic kidney disease, stage 5 | ✓ |
| N18.6 | End stage renal disease | ✓ |
| N18.6 | End stage renal disease | ✓ |
| N18.9 | Chronic kidney disease, unspecified | ✓ |
| N18.9 | Chronic kidney disease, unspecified | ✓ |
| N18.30 | Chronic kidney disease, stage 3 unspecified | ✓ |
| N18.30 | Chronic kidney disease, stage 3 unspecified | ✓ |
| N18.31 | Chronic kidney disease, stage 3a | ✓ |
| N18.31 | Chronic kidney disease, stage 3a | ✓ |
| N18.32 | Chronic kidney disease, stage 3b | ✓ |
| N18.32 | Chronic kidney disease, stage 3b | ✓ |
Frequently asked questions
What is ICD-10-CM code N18?
N18 is an ICD-10-CM category covering Chronic kidney disease (CKD). It contains 20 more specific diagnosis codes, 18 of which are billable.
Is N18 a billable code?
No — N18 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example N18.1 — Chronic kidney disease, stage 1). 18 of the 20 codes under N18 are billable.
What codes fall under N18?
N18 includes N18.1, N18.1, N18.2, N18.2, N18.3, plus 15 more. See the full list with descriptions and billable status above.
More free billing tools: all ICD-10 categories · ICD-10 search · denial codes · Medicare fees
Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
Code the diagnosis right
Join providers across the country delivering modern virtual care with CareNiva. Free to start, ready in minutes.
100% Satisfaction Guaranteed — try it risk-free