| N01 | Rapidly progressive nephritic syndrome | NON-BILLABLE CODE |
| N01.1 | Rapidly progressive nephritic syndrome with focal and segmental glomerular lesions | BILLABLE CODE |
| N01.2 | Rapidly progressive nephritic syndrome with diffuse membranous glomerulonephritis | BILLABLE CODE |
| N01.3 | Rapidly progressive nephritic syndrome with diffuse mesangial proliferative glomerulonephritis | BILLABLE CODE |
| N01.4 | Rapidly progressive nephritic syndrome with diffuse endocapillary proliferative glomerulonephritis | BILLABLE CODE |
| N01.5 | Rapidly progressive nephritic syndrome with diffuse mesangiocapillary glomerulonephritis | BILLABLE CODE |
| N01.6 | Rapidly progressive nephritic syndrome with dense deposit disease | BILLABLE CODE |
| N01.7 | Rapidly progressive nephritic syndrome with diffuse crescentic glomerulonephritis | BILLABLE CODE |
| N01.8 | Rapidly progressive nephritic syndrome with other morphologic changes | BILLABLE CODE |
| N01.9 | Rapidly progressive nephritic syndrome with unspecified morphologic changes | BILLABLE CODE |
| N01.A | Rapidly progressive nephritic syndrome with C3 glomerulonephritis | BILLABLE CODE |
