N00.BAcute nephritic syndrome with immune complex membranoproliferative glomerulonephritis

N00.B is the ICD-10-CM diagnosis code for acute nephritic syndrome with immune complex membranoproliferative glomerulonephritis. It belongs to category N00 (acute nephritic syndrome), block N00-N08 (glomerular diseases) and chapter 14 (diseases of the genitourinary system). It is a header code, so it can't be reported by itself; one of its 2 subcodes must be used instead.

Within N00 (acute nephritic syndrome), N00.B is specifically for acute nephritic syndrome with immune complex membranoproliferative glomerulonephritis. Related codes cover with minor glomerular abnormality (N00.0), with focal and segmental glomerular lesions (N00.1), with diffuse membranous glomerulonephritis (N00.2), with diffuse mesangial proliferative glomerulonephritis (N00.3), with diffuse endocapillary proliferative glomerulonephritis (N00.4), with diffuse mesangiocapillary glomerulonephritis (N00.5), with dense deposit disease (N00.6), with diffuse crescentic glomerulonephritis (N00.7) and 3 more.

To report this condition, pick the subcode that matches the documentation: N00.B1 ((IC-MPGN)) and N00.B2 ((IC-MPGN)).

It was added in FY2026, effective October 1, 2025.