Table of contents Summary* Glossary* Context Introduction to HCX* Technical Specifications Open Protocol Registries* QR Code Specifications* Claims Data Exchange (HCX) Protocol Message Flows* Primary Message Flow Additional Message Flows Redirect Forward Intra Cycle Communication* Seeking Supporting Information Seeking Beneficiary Consent Seeking Account Information Relay Third party Information sharing Notifications Categories List of key topics Message Structure API Specifications* Registry APIs Primary Flow APIs Supporting APIs Notification APIs Error Handling Data Security and Privacy Transport Security Message Security and Integrity API Security* Audit and Reporting Digital Network Policies Domain Specifications Domain Data Models Handling Attachments Handling Processing Errors Terminologies Domain Specific Languages (DSLs) FHIR Implementation Guide* Business Policy Specifications Access Control (Roles)* Guidelines for Participant Onboarding* Sandbox process Production onboarding (Go live)* Potential De-boarding scenarios Guidelines for Grievance Redressal Scope of disputes Involved participants Guideline process for dispute resolution Guidelines for leveraging FTA Next steps Guidelines for SLAs and ecosystem satisfaction Guidelines for Operating charges Guidelines for Beneficiary Authentication by Providers/Payors Guidelines for Event audits Reference Templates HCX - Terms of use Payer-Provider addendum Payer-Policyholder addendum Next steps Use cases* OPD Typical Workflows Cashless Reimbursement Mapping to the HCX protocol Cashless Reimbursement IPD Typical Workflows Cashless Reimbursement Mapping to the HCX protocol Cashless Reimbursement Implementation Considerations Contributing to the protocol Future Focus Areas*