N00.5
BillableAcute nephritic syndrome with diffuse mesangiocapillary glomerulonephritis
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is N00.5 an HCC code?
No. N00.5 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
N00.5 is the ICD-10-CM diagnosis code for acute nephritic syndrome with diffuse mesangiocapillary glomerulonephritis. A sudden kidney inflammation where the filtering units show abnormal cell growth in both the central support structure and blood vessel walls of the glomeruli. N00.5 sits in the ICD-10-CM chapter for diseases of the genitourinary system (n00-n99), within the section covering glomerular diseases (n00-n08).
N00.5 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.
Verify biopsy results document mesangiocapillary involvement pattern.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for N00.5 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify biopsy results document mesangiocapillary involvement pattern
- •This morphology is associated with specific immunological findings that should be documented