Where used:
| Attribute | PATIENT PROCEDURE CODING SIGNIFICANCE | references in description PRIMARY OPERATION (OPCS-4) |
| Class | OPERATIVE PROCEDURE | references in description PRIMARY OPERATION (OPCS-4) |
| Class | PATIENT PROCEDURE CLASSIFICATION | references in description PRIMARY OPERATION (OPCS-4) |
| Data Element | FOURTH OPERATION (OPCS-4) (deleted) | references in description PRIMARY OPERATION (OPCS-4) |
| Data Element | PRIMARY PROCEDURE DATE | references in description PRIMARY OPERATION (OPCS-4) |
| Data Element | PROCEDURE CODING | references in description PRIMARY OPERATION (OPCS-4) |
| Data Element | SECOND OPERATION (OPCS-4) (deleted) | references in description PRIMARY OPERATION (OPCS-4) |
| Data Element | THIRD OPERATION (OPCS-4) | references in description PRIMARY OPERATION (OPCS-4) |
| Dataset | HES - CDS Data items cross referenced by HES Item - Table 2 | references in description PRIMARY OPERATION (OPCS-4) |
| Dataset | HES GENERAL EPISODE RECORD (deleted) | references in description PRIMARY OPERATION (OPCS-4) |