N00.B2
BillableAcute nephritic syndrome with secondary immune complex membranoproliferative glomerulonephritis (IC-MPGN)
Last updated: FY2026 ICD-10-CM (Oct 1, 2025 – Sep 30, 2026) | CMS-HCC V28 (100% phase-in, PY2026)
Is N00.B2 an HCC code?
No. N00.B2 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.B2 is the ICD-10-CM diagnosis code for acute nephritic syndrome with secondary immune complex membranoproliferative glomerulonephritis (ic-mpgn). A sudden kidney inflammation caused by immune complex deposits in the filtering units that result from a known systemic disease or condition. N00.B2 sits in the ICD-10-CM chapter for diseases of the genitourinary system (n00-n99), within the section covering glomerular diseases (n00-n08).
N00.B2 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.
Always code the underlying systemic disease (e.g., lupus, hepatitis B) as an additional diagnosis.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for N00.B2 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Always code the underlying systemic disease (e.g., lupus, hepatitis B) as an additional diagnosis
- •Document the specific secondary cause in the medical record for complete clinical documentation