| N06 | Isolated proteinuria with specified morphological lesion | NON-BILLABLE CODE |
| N06.0 | Isolated proteinuria with minor glomerular abnormality | BILLABLE CODE |
| N06.1 | Isolated proteinuria with focal and segmental glomerular lesions | BILLABLE CODE |
| N06.2 | Isolated proteinuria with diffuse membranous glomerulonephritis | NON-BILLABLE CODE |
| N06.20 | Isolated proteinuria with diffuse membranous glomerulonephritis, unspecified | BILLABLE CODE |
| N06.21 | Primary membranous nephropathy with isolated proteinuria | BILLABLE CODE |
| N06.22 | Secondary membranous nephropathy with isolated proteinuria | BILLABLE CODE |
| N06.29 | Other isolated proteinuria with diffuse membranous glomerulonephritis | BILLABLE CODE |
| N06.4 | Isolated proteinuria with diffuse endocapillary proliferative glomerulonephritis | BILLABLE CODE |
| N06.5 | Isolated proteinuria with diffuse mesangiocapillary glomerulonephritis | BILLABLE CODE |
| N06.6 | Isolated proteinuria with dense deposit disease | BILLABLE CODE |
| N06.7 | Isolated proteinuria with diffuse crescentic glomerulonephritis | BILLABLE CODE |
| N06.8 | Isolated proteinuria with other morphologic lesion | BILLABLE CODE |
| N06.9 | Isolated proteinuria with unspecified morphologic lesion | BILLABLE CODE |
| N06.A | Isolated proteinuria with C3 glomerulonephritis | BILLABLE CODE |
