N04.4
BillableNephrotic syndrome with diffuse endocapillary proliferative glomerulonephritis
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is N04.4 an HCC code?
No. N04.4 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
N04.4 is the ICD-10-CM diagnosis code for nephrotic syndrome with diffuse endocapillary proliferative glomerulonephritis. A kidney condition where cells lining the inner surface of the kidney's blood vessels multiply, causing the kidneys to leak protein. N04.4 sits in the ICD-10-CM chapter for diseases of the genitourinary system (n00-n99), within the section covering glomerular diseases (n00-n08).
N04.4 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.
Endocapillary proliferation specifically involves the capillary endothelium; distinguish from other proliferative patterns in documentation.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for N04.4 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Endocapillary proliferation specifically involves the capillary endothelium; distinguish from other proliferative patterns in documentation
- •This pattern is commonly associated with post-infectious glomerulonephritis; document any recent infections