| Code | Display | Definition |
| provider-src | Provider-sourced | The metric information was captured from the provider system's perspective |
| payer-src | Payer-sourced | The metric information was captured from the payer system's perspective |
| intermediary-src | Intermediary-sourced | The metric information was captured from the intermediary system's perspective |
| changed | Changed | Previously sent information has been changed. |
| added | Added | New information that was not sent previously. |
| patientEvent | Patient Event | Information about the dates of the event that are being requested. |
| admissionDates | Admission Dates | Information about the admission dates of a hospital admission being requested. |
| dischargeDates | Discharge Dates | Information about discharge dates of a hospital admission being requested. |
| additionalInformation | Additional Information | Send additional paperwork or supporting information for the request. |
| freeFormMessage | Free Form Message | Send text messages to the UMO. |
| institutionalEncounter | Institutional Encounter | Information about a hospital claim being requested. |
| result-available | Result Available | A new result for a PAS submission is now available. |
| admitting | Admitting | The diagnosis given as the reason why the patient was admitted to the hospital. |
| principal | Principal | The single medical diagnosis that is most relevant to the patient's chief complaint or need for treatment. |
| patientreasonforvisit | Patient Reason For Visit | The diagnosis given as why the patient came to the hospital. |
| CDEX | CDex Submit-Attachment | Via a CDex Submitt-Attachment operation |
| attachment-request-code | Attach Request Code | Attachments are identified by LOINC or PWK01 codes |
| attachment-request-questionnaire | Attachment Request Questionnaire | Attachments are identified by a questionnaire using the TRN input parameter |
| priorAuthorization | Prior Authorization Information Request | Additional information is needed to determine response for a prior authorization |
| payer-url | Payer URL | The Payer Endpoint URL needed to submit attachments |
| attachments-needed | Attachments Needed | Communicates what attachments are needed |