| Code | Description | Comment | Version |
| G | This observation/service is on the formulary, and has guidelines | | added v2.4 |
| N | This observation/service is not on the formulary | | added v2.4 |
| R | This observation/service is on the formulary, but is restricted | | added v2.4 |
| Y | This observation/service is on the formulary | | added v2.4 |