FHIR-on-VistA

This repository consists of two main components:

1. A VistA application which provides a REST API on top of VistA
2. A Java application that provides a FHIR API on top of the VistA application

Each is necessary to provide a FHIR API on top of an instance of VistA.

The VistA REST API reads data from a VistA instance and returns data either as delimted text or as JSON. The Java FHIR API calls the VistA REST API and translates the delimited text or JSON into FHIR. Currently this Java FHIR API returns FHIR data as R4 (as of v2.0.0).

Quick Start

If you want to get started quickly on a recent computer that can run Docker, go to Java API Implementation, and look for the Docker section. Once you have started the 2 containers, visit localhost:8080/api/Patient to get a list of patients.

VistA REST API

The REST services use the M web server to return data as either delimited text or JSON.

VistA REST API Implementation

Java Application

The Java application provids a FHIR API using Spring Boot and the Hapi FHIR framework.

Currently, the API provides the following FHIR resources:

• Patient
• Care Team
• Condition
• Observation
• Location
• MedicationStatement (new in v2.0)

Within the Patient resource the following compartments are available:

• Condition
• Encounter
• Practitioner
• Observation
• Medication Statement
• Medication Dispense
• Medication Administration
• Composition
• Procedure
• Flag
• Appointment
• Allergy Intolerance
• Immunization
• Goal
• CarePlan
• Diagnostic Report

Java API Implementation

Long Term Goals

VistA REST API

• More JSON endpoints, replacing text-delimited enpoints (in progress)
• More FHIR resource support (in progress to comply with US Core STU3/FHIR R4)
• Actual FHIR from endpoints (not started)

Java

• STU 4 (completed)
• Migrate to Java 11 (not started)
• Junit 5 (not stared)
• More FHIR resources (in progress)
• More JSON consumption, replacing text-delimited consumption. (in progress)

Related Projects

The VistA FHIR Data Loader project can be used in conjunction with this project to provide a complete VistA test or development environment. The VistA FHIR Data Loader can generate high quality synthetic patient data in VistA that can be exposed via this project.