CMS encouraged the use of certain Health Level 7® (HL7) Fast Healthcare Interoperability Resources® (FHIR) Implementation Guides, and provided links to information and resources on our website. There are a number of implementer work groups in which impacted payers and their vendors may be interested in participating to support their project development and implementation plans. Technical questions may be addressed from these resources through the main HL7® Zulip chat stream (https://chat.fhir.org/) or to one of the HL7® Zulip chat links below based on the relevant IG.

• Carin BB: https://chat.fhir.org/#narrow/stream/204607-CARIN-IG.20for.20Blue.20Button
• PDex: https://chat.fhir.org/#narrow/stream/235286-Da-Vinci.20PDex
• Formulary: https://chat.fhir.org/#narrow/stream/197730-Da-Vinci.20PDex.20Drug.20Formulary
• Plan Net/Directory: https://chat.fhir.org/#narrow/stream/229922-Da.2BVinci.2BPDex.2BPlan-Net
• To obtain an account, visit the Zulip chat home page at: https://chat.fhir.org/ .
  For additional guidance, refer to the HL7 confluence site at: https://confluence.hl7.org/display/CAR/CMS+Patient+Access+API+%3A+Industry+Questions+and+CMS+Answers.
• For testing questions and support: https://touchstone.aegis.net/touchstone/