ICD-10-CM > N00-N99 > N00-N08 > N04 > N04.B N04.B Nephrotic syndrome with immune complex membranoproliferative glomerulonephritis (IC-MPGN) Non-Billable/Non-Specific Codes N04.B1Nephrotic syndrome with idiopathic immune complex membranoproliferative glomerulonephritis (IC-MPGN)N04.B2Nephrotic syndrome with secondary immune complex membranoproliferative glomerulonephritis (IC-MPGN)