ICD-10 N18.1
Billable / SpecificChronic kidney disease, stage 1
About ICD-10-CM N18.1
ICD-10-CM code N18.1 represents Chronic kidney disease, stage 1. This is a billable/specific code in the Genitourinary System chapter (block N18). The 2026 edition of ICD-10-CM N18.1 became effective on October 1, 2025.
Medicare Advantage HCC Impact
Capture this diagnosis annually for accurate risk adjustment. Missed HCC captures are the #1 revenue leak in Medicare Advantage risk programs.
Medicare LCD Coverage for N18.1
Local Coverage Determinations (LCDs) from CMS MACs that list N18.1 as a covered diagnosis.
Showing top 10 of 229 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing N18.1.
1 Cigna
5 Medicare
CPT Codes Commonly Billed with N18.1
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
Convert N18.1 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| N18.1 | 5851 | 00000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To N18.1
Other codes in section N17-N19 (Acute kidney failure and chronic kidney disease).
ICD-10 N18.1, Billing FAQ
Is ICD-10 code N18.1 billable? +
Yes, N18.1 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What CPT codes are commonly billed with N18.1? +
Procedures frequently paired with N18.1 include: 0105U, 0407U.
What ICD-9 codes does N18.1 map to? +
Per CMS GEMs, N18.1 maps to ICD-9 codes: 5851. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
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