Implement a FHIR-based prior authorization workflow end-to-end using Da Vinci PAS: submit the prior authorization request bundle, handle real-time pend responses, poll for final determination, and process approve and deny outcomes

Verified steps

1. Construct the PAS prior authorization request bundle containing a Claim resource (with use=preauthorization), referenced supporting resources (Patient, Coverage, Practitioner, Organization, ServiceRequest or DeviceRequest), and any required documentation attachments as DocumentReference resources
2. POST the bundle to the payer's FHIR $submit operation endpoint and handle the three possible immediate responses: approved (ClaimResponse with outcome=complete), denied (ClaimResponse with outcome=error), or pended (ClaimResponse with outcome=queued and a pending trace ID)
3. For pended responses, store the prior authorization trace ID from the ClaimResponse and implement a polling loop using the $inquire operation with the trace ID to check for final determination
4. Process the final ClaimResponse: extract the adjudication elements for approved services and quantities, denied line items with denial reason codes, and any partial approvals where only some requested services were authorized
5. Surface the determination to the clinical workflow: communicate approved auth numbers to downstream scheduling and claims systems, route denials to the appeals queue with reason codes, and alert clinicians to partial approvals requiring clinical review