| Source | Code | Name | Case count | Share of cases (%) |
|---|---|---|---|---|
| OPER_IN | OPER_IN_NOM(DNB20) | Endoscopic ethmoidectomy | 3662 | |
| OPER_OUT | OPER_OUT_NOM(DNB20) | Endoscopic ethmoidectomy | 354 | |
| OPER_IN | OPER_IN_NOM(DNB10) | Endonasal ethmoidectomy | 178 | |
| OPER_IN | OPER_IN_NOM(DNB00) | External ethmoidectomy | 33 |