N02.B1 ICD-10-CM Code: Recurrent and persistent immunoglobulin A nephropathy with glomerular lesion
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FY 2026 Apr update / Diseases of the genitourinary system (N00-N99) / Glomerular diseases (N00-N08)
N02.B1
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceRecurrent and persistent immunoglobulin A nephropathy with glomerular lesion
Repeated episodes of blood in the urine due to IgA nephropathy, an autoimmune kidney disease where immunoglobulin A antibodies damage the kidney filters.
CMS-HCC V28
00
RAF 0
CMS-HCC V24
00
RAF 0
ACA/HHS
00
RAF 0
ESRD/PACE
00
RAF 0
RXHCC
00
RAF 0
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Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for N02.B1 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for N02.B1 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for N02.B1 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for N02.B1 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for N02.B1 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for N02.B1 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for N02.B1 in this effective period.
Buddy Documentation Tip
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is N02.B1 an HCC code?
No. N02.B1 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
N02.B1 is the ICD-10-CM diagnosis code for recurrent and persistent immunoglobulin a nephropathy with glomerular lesion. Repeated episodes of blood in the urine due to IgA nephropathy, an autoimmune kidney disease where immunoglobulin A antibodies damage the kidney filters. N02.B1 sits in the ICD-10-CM chapter for diseases of the genitourinary system (n00-n99), within the section covering glomerular diseases (n00-n08).
N02.B1 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.
Confirm kidney biopsy showing IgA deposits on immunofluorescence microscopy.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for N02.B1 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Confirm kidney biopsy showing IgA deposits on immunofluorescence microscopy
- •B1 indicates minimal glomerular changes; document the specific pathological findings