| N03 | Chronic nephritic syndrome | NON-BILLABLE CODE |
| N03.1 | Chronic nephritic syndrome with focal and segmental glomerular lesions | BILLABLE CODE |
| N03.2 | Chronic nephritic syndrome with diffuse membranous glomerulonephritis | BILLABLE CODE |
| N03.3 | Chronic nephritic syndrome with diffuse mesangial proliferative glomerulonephritis | BILLABLE CODE |
| N03.4 | Chronic nephritic syndrome with diffuse endocapillary proliferative glomerulonephritis | BILLABLE CODE |
| N03.5 | Chronic nephritic syndrome with diffuse mesangiocapillary glomerulonephritis | BILLABLE CODE |
| N03.6 | Chronic nephritic syndrome with dense deposit disease | BILLABLE CODE |
| N03.7 | Chronic nephritic syndrome with diffuse crescentic glomerulonephritis | BILLABLE CODE |
| N03.8 | Chronic nephritic syndrome with other morphologic changes | BILLABLE CODE |
| N03.9 | Chronic nephritic syndrome with unspecified morphologic changes | BILLABLE CODE |
| N03.A | Chronic nephritic syndrome with C3 glomerulonephritis | BILLABLE CODE |
