ICD-10 N18.9
Billable / SpecificChronic kidney disease, unspecified
About ICD-10-CM N18.9
ICD-10-CM code N18.9 represents Chronic kidney disease, unspecified. This is a billable/specific code in the Genitourinary System chapter (block N18). The 2026 edition of ICD-10-CM N18.9 became effective on October 1, 2025.
Coding Tips for N18.9
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
CKD unspecified. Use the specific stage (N18.1 through N18.6) when documented. CKD stages 4 and 5 are HCC v28 captures worth significant RAF.
Inclusion Terms / Approximate Synonyms
Clinical terms and conditions classified under N18.9. Per CMS ICD-10-CM Tabular 2026.
- Chronic renal disease
- Chronic renal failure NOS
- Chronic renal insufficiency
- Chronic uremia NOS
- Diffuse sclerosing glomerulonephritis NOS
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 N18.9
Local Coverage Determinations (LCDs) from CMS MACs that list N18.9 as a covered diagnosis.
Showing top 10 of 126 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing N18.9.
1 Cigna
5 Medicare
5 Aetna
CPT Codes Commonly Billed with N18.9
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- 80053 Comprehensive metabolic panel — diabetes, HTN, CKD, hyperlipidemia, electrolyte disorders, anemia, thyroid, prediabetes, abnormal labs, routine exam, screening Laboratory
Convert N18.9 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 |
|---|---|---|
| N18.9 | 5859 | 00000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To N18.9
Other codes in section N17-N19 (Acute kidney failure and chronic kidney disease).
ICD-10 N18.9, Billing FAQ
Is ICD-10 code N18.9 billable? +
Yes, N18.9 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What other names or terms map to N18.9? +
ICD-10 N18.9 includes: Chronic renal disease; Chronic renal failure NOS; Chronic renal insufficiency, and 2 more clinical synonyms.
What CPT codes are commonly billed with N18.9? +
Procedures frequently paired with N18.9 include: 80053.
What ICD-9 codes does N18.9 map to? +
Per CMS GEMs, N18.9 maps to ICD-9 codes: 5859. 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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