ICD-10 N03.6
Billable / Specific CCChronic nephritic syndrome with dense deposit disease
About ICD-10-CM N03.6
ICD-10-CM code N03.6 represents Chronic nephritic syndrome with dense deposit disease. This is a billable/specific code in the Genitourinary System chapter (block N03). The 2026 edition of ICD-10-CM N03.6 became effective on October 1, 2025.
Coding Tips for N03.6
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
N03.6 is designated CC for MS-DRG grouping. On inpatient claims, this code can shift the DRG to the with-CC variant when documented as a present-on-admission secondary diagnosis. Hospital CDI programs flag CC opportunities during chart review. Failure to capture this code may leave 30 to 80 percent of the inpatient stay revenue unrealized.
Inclusion Terms / Approximate Synonyms
Clinical terms and conditions classified under N03.6. Per CMS ICD-10-CM Tabular 2026.
- Chronic nephritic syndrome with C3 glomerulopathy with dense deposit disease
- Chronic nephritic syndrome with membranoproliferative glomerulonephritis, type 2
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.
Inpatient DRG Impact, CC
codes Chronic nephritic syndrome with dense deposit disease. As a Complication/Comorbidity (CC), this contributes to DRG severity adjustment when documented alongside the principal diagnosis.
Medicare LCD Coverage for N03.6
Local Coverage Determinations (LCDs) from CMS MACs that list N03.6 as a covered diagnosis.
Showing top 10 of 13 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing N03.6.
4 Medicare
CPT Codes Commonly Billed with N03.6
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- Q5152 CMS LCD: Billing and Coding: Eculizumab, and Biosimilars: EPYSQLI�-eculizumab-aagh, and BKEMV�-eculizumab-aeeb CMS LCD
- Q5151 CMS LCD: Billing and Coding: Eculizumab, and Biosimilars: EPYSQLI�-eculizumab-aagh, and BKEMV�-eculizumab-aeeb CMS LCD
- J1299 CMS LCD: Billing and Coding: Eculizumab, and Biosimilars: EPYSQLI�-eculizumab-aagh, and BKEMV�-eculizumab-aeeb CMS LCD
Convert N03.6 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 |
|---|---|---|
| N03.6 | 5822 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To N03.6
Other codes in section N00-N08 (Glomerular diseases).
ICD-10 N03.6, Billing FAQ
Is ICD-10 code N03.6 billable? +
Yes, N03.6 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 N03.6? +
ICD-10 N03.6 includes: Chronic nephritic syndrome with C3 glomerulopathy with dense deposit disease; Chronic nephritic syndrome with membranoproliferative glomerulonephritis, type 2.
Is N03.6 a CC or MCC for inpatient DRG? +
Yes, this code is designated as CC. Documenting as a secondary diagnosis on inpatient claims can shift the DRG to a higher-weighted category.
What CPT codes are commonly billed with N03.6? +
Procedures frequently paired with N03.6 include: Q5152, Q5151, J1299.
What ICD-9 codes does N03.6 map to? +
Per CMS GEMs, N03.6 maps to ICD-9 codes: 5822. 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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