N04.6
BillableNephrotic syndrome with dense deposit disease
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is N04.6 an HCC code?
No. N04.6 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
N04.6 is the ICD-10-CM diagnosis code for nephrotic syndrome with dense deposit disease. A rare kidney disorder where dense deposits form in the kidney's filtering units, causing severe protein loss and progressive kidney damage. N04.6 sits in the ICD-10-CM chapter for diseases of the genitourinary system (n00-n99), within the section covering glomerular diseases (n00-n08).
N04.6 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
Dense deposit disease (formerly called membranoproliferative glomerulonephritis type II) is a specific pathologic finding; confirm diagnosis with electron microscopy findings.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for N04.6 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Dense deposit disease (formerly called membranoproliferative glomerulonephritis type II) is a specific pathologic finding; confirm diagnosis with electron microscopy findings
- •This condition often progresses to kidney failure; monitor renal function closely and document progression