This is the Continuous Integration Build of FHIR (will be incorrect/inconsistent at times). 
See the Directory of published versions 
FHIR is a standard for health care data exchange, published by HL7®.
Note to Balloters: This publication is the third draft ballot of R6 (Release 6). Details on the scope of the ballot and how to participate in voting can be found here.
First time here? READ THIS FIRST! 
Then see the executive summary, the developer's introduction,
clinical introduction, patient introduction, or
architect's introduction, and then the FHIR overview & how FHIR versions work.
See also the open license (CC0) (and don't miss the full Table of Contents and the Community Credits 
or you can search this specification).
Level 1 Basic framework on which the specification is built
Level 2 Supporting implementation and binding to external specifications
Level 3 Linking to real-world concepts in the healthcare system
Level 4 Record-keeping and Data Exchange for the healthcare process
Allergy, Problem, Procedure, CarePlan/Goal, Family History, RiskAssessment, etc.
Observation, DiagnosticReport, Specimen, ImagingStudy, MolecularDefinition, DocumentReference, ServiceRequest, etc.
Introduction + Task, Appointment, Schedule, Referral, PlanDefinition, etc.
                Claim, Account,
Invoice, ChargeItem, 
                Coverage + Eligibility 
Request &
                Response, ExplanationOfBenefit, etc.
            
Level 5 Providing the ability to reason about the healthcare process
Medicinal, Packaged & Administrable product definitions, Regulated Authorization, etc.