ICD-10-CM > N00-N99 > N00-N08 > N03 > N03.5 N03.5 Chronic nephritic syndrome with diffuse mesangiocapillary glomerulonephritis Billable/Specific Copy Code Copy Description Applicable To Chronic nephritic syndrome with membranoproliferative glomerulonephritis, types 1 and 3, or NOS Type 1 Excludes Chronic nephritic syndrome with C3 glomerulonephritis (N03.A)Chronic nephritic syndrome with C3 glomerulopathy (N03.A)