HL7 ships a paid on-demand bundle — "Da Vinci Provider/Payer FHIR Implementation Guide Essentials" — in three modules: FHIR core technologies, Burden Reduction / prior auth (explicitly CMS-0057-aligned), and Payer Data Exchange (PDex). We are not buying the courses. We use their published outline as a free information architecture: a market-validated answer to "what do people need to know, in what order."

The spine that repeats across modules is the load-bearing set: HRex and Member Attribution show up in both burden-reduction and PDex tracks; CQL and SDC show up in both foundations and DTR. Module A covers foundations (US Core, SMART/CDS Hooks, questionnaires); Module B is CRD → DTR → PAS → CDex for PAS; Module C is the member-data story (PDex + CARIN Blue Button).

What ImOnFHIR does with it: each library card links to the free authoritative source (the IG itself, CMS rule pages, open specs). When useful, we note that HL7 offers a paid guided course — a breadcrumb, not a substitute for the open IGs our lab actually validates against.