| N00 | Acute nephritic syndrome | NON-BILLABLE CODE |
| N00.0 | Acute nephritic syndrome with minor glomerular abnormality | BILLABLE CODE |
| N00.1 | Acute nephritic syndrome with focal and segmental glomerular lesions | BILLABLE CODE |
| N00.2 | Acute nephritic syndrome with diffuse membranous glomerulonephritis | BILLABLE CODE |
| N00.3 | Acute nephritic syndrome with diffuse mesangial proliferative glomerulonephritis | BILLABLE CODE |
| N00.4 | Acute nephritic syndrome with diffuse endocapillary proliferative glomerulonephritis | BILLABLE CODE |
| N00.5 | Acute nephritic syndrome with diffuse mesangiocapillary glomerulonephritis | BILLABLE CODE |
| N00.6 | Acute nephritic syndrome with dense deposit disease | BILLABLE CODE |
| N00.8 | Acute nephritic syndrome with other morphologic changes | BILLABLE CODE |
| N00.9 | Acute nephritic syndrome with unspecified morphologic changes | BILLABLE CODE |
| N00.A | Acute nephritic syndrome with C3 glomerulonephritis | BILLABLE CODE |
