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Backend 2024

FHIR Healthcare Integration

HAPI FHIR + Spring Boot

Developed HL7 FHIR R4 compliant healthcare interoperability demo using HAPI FHIR server framework on Spring Boot 3. System implements FHIR resource APIs (Patient, Observation, Medication, Procedure, DiagnosticReport), SMART-on-FHIR OAuth2 authorization for third-party app integration, FHIR Bulk Data Access API for population health analytics, clinical decision support with drug interaction checking. Demonstrates modern healthcare data exchange patterns: RESTful FHIR APIs, HL7 v2 message parsing for legacy system integration, terminology mapping (SNOMED CT, LOINC, RxNorm), HIPAA-compliant PHI encryption.

FHIR R4
Standard
10+ types
Resources
SMART-on-FHIR
Auth
HL7 v2.x
Legacy
3 systems
Terminology
HIPAA
Compliance
01

The Challenge

Healthcare data scattered across siloed EHR systems prevents coordinated care. Patient records use proprietary formats making interoperability difficult. Legacy HL7 v2 systems lack standardization. Need modern FHIR-based data exchange enabling seamless integration across hospitals, clinics, labs. SMART-on-FHIR apps require OAuth2 authorization. Clinical decision support needs drug interaction checking.

02

The Solution

Built FHIR R4 compliant server using HAPI FHIR framework on Spring Boot 3. Implemented RESTful FHIR resource APIs (Patient, Observation, Medication, etc.), SMART-on-FHIR OAuth2 auth for third-party apps, FHIR Bulk Data API for analytics, clinical decision support with drug interaction database. HL7 v2 message parser for legacy integration. Terminology mapping (SNOMED CT, LOINC, RxNorm).

Technology Stack

HAPI FHIR 7.0
HL7 FHIR R4
Spring Boot 3.3
Java 21
Python 3.11+
Apache Kafka 3.6+
Apache Camel 4.4
PostgreSQL 16
Redis 7.2
Keycloak 24
Docker 24.0
Docker Compose
OAuth2
Postman (API testing)
03

Architecture

  • HAPI FHIR 7.0 server on Spring Boot 3.3 foundation
  • HL7 FHIR R4 compliant resource representation
  • RESTful APIs with FHIR CRUD operations (Create, Read, Update, Delete)
  • SMART-on-FHIR OAuth2 authorization via Keycloak
  • HL7 v2.x message transformation to FHIR via Apache Camel
  • Kafka integration for real-time ADT event streaming
  • PostgreSQL 16 optimized FHIR resource storage
  • Terminology server with SNOMED CT, LOINC, RxNorm mappings
  • HIPAA-compliant audit logging and PHI encryption
  • Docker Compose deployment for development
04

Key Features

01
HAPI FHIR 7.0 server implementing HL7 FHIR R4 resources
02
RESTful FHIR APIs: Patient, Observation, Medication, Procedure, DiagnosticReport
03
SMART-on-FHIR OAuth2 authorization for third-party apps
04
FHIR Bulk Data Access API for data export and analytics
05
Clinical decision support: drug-drug interaction checking
06
HL7 v2.x message parser (ADT, ORM, ORU) for legacy integration
07
FHIR subscription mechanism for event notifications
08
Terminology mapping: SNOMED CT, LOINC, RxNorm code systems
09
HIPAA-compliant PHI encryption (AES-256) and audit logging
10
Kafka integration for real-time ADT (Admit/Discharge/Transfer) feeds
11
PostgreSQL 16 backend with optimized FHIR resource storage
12
Docker Compose deployment for local development and testing
05

Results & Impact

  • HAPI FHIR 7.0 server implementing HL7 FHIR R4 standard resources
  • RESTful APIs: Patient, Observation, Medication, Procedure, DiagnosticReport
  • SMART-on-FHIR OAuth2 authorization enabling third-party app integration
  • FHIR Bulk Data Access API for population health analytics
  • Clinical decision support: drug-drug interaction checking via API
  • HL7 v2 message parser for legacy system integration (ADT, ORM, ORU)
  • Terminology mapping: SNOMED CT, LOINC, RxNorm code systems
  • HIPAA-compliant PHI encryption (AES-256) and audit logging

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