Data Interoperability (HL7/FHIR)

Unify fragmented healthcare data across your entire clinical network.

Engineering Approach

When acquiring new clinics or merging hospital networks, disjointed data models create immediate clinical risk. We engineer robust data pipelines that ingest messy, legacy HL7 feeds and normalize them into clean, standardized FHIR resources, ensuring every provider has a unified 360-degree view of the patient history. Healthcare data fragmentation is the silent operational killer for scaling clinic networks. When you acquire a new practice, you inherit their EHR system, their patient database schema, and their clinical terminology — none of which aligns with your existing infrastructure. Providers can't see historical lab results from the acquired clinic. Duplicate patient records proliferate because the Master Patient Index (MPI) has no way to match 'John Smith DOB 1985-03-15' in System A with 'J. Smith DOB 03/15/1985' in System B. Billing teams can't reconcile insurance eligibility because payer IDs are stored differently across systems. The clinical risk is immediate and severe: a provider prescribes a medication that interacts with a drug from the patient's old clinic, but the interaction never fires because the medication history lives in a disconnected database. The financial risk is equally bad: duplicate patient accounts lead to claim denials, and fragmented billing data makes it impossible to track revenue cycle performance across your full network. Solving this requires data interoperability engineering — not IT support, not EHR consultants, but engineers who can build HL7 v2 parsers, FHIR transformation pipelines, and probabilistic patient matching algorithms that unify fragmented data into a single source of truth. We specialize in the messy reality of healthcare data: legacy HL7 ADT feeds that use non-standard Z-segments, proprietary EHR database schemas with no documentation, and clinical terminology that mixes SNOMED, ICD-10, LOINC, and custom codes in the same field. Our data pipelines ingest all of it, normalize it into FHIR R4 resources, and expose a unified API that your clinical applications can query without knowing which legacy system the data came from.

Core Benefits

Unified Patient Records
Standardized FHIR APIs
Legacy Data Migration

Technical Capabilities

  • HL7 to FHIR Transformation Pipelines
  • Legacy Database Merges & Migrations
  • Real-Time ADT Feed Processing
  • Clinical Terminology Normalization

Our Methodology

Our data interoperability process begins with a full data audit across all source systems: EHR databases, PM systems, lab interfaces, and ADT feeds. We extract sample data sets and analyze schema inconsistencies, duplicate patient records, and terminology mismatches. From this audit, we design a unified FHIR-based data model that serves as the canonical representation of patient, encounter, and clinical data. We then build ETL pipelines using Apache NiFi, AWS Glue, or custom Python scripts to extract data from legacy systems, transform it into FHIR resources, and load it into a centralized FHIR server (typically HAPI FHIR or Google Cloud Healthcare API). For real-time data sync, we implement HL7 v2 MLLP listeners that consume ADT feeds (patient admissions, discharges, transfers) and parse them into FHIR Patient and Encounter resources. Clinical terminology normalization is handled using UMLS and VSAC value sets — we map local lab codes to LOINC, custom diagnosis codes to ICD-10, and medication names to RxNorm. Patient matching across systems is solved using probabilistic record linkage algorithms (Jaro-Winkler string distance on names, exact match on DOB and SSN, fuzzy match on address). Once the unified FHIR data store is operational, we expose REST APIs that your clinical applications can query for patient demographics, lab results, medications, and encounter history. We provide a web-based patient search interface for administrative staff to manually review and merge duplicate records. The entire pipeline is monitored with DataDog or CloudWatch, and we implement data quality checks that alert you when records fail validation or critical fields are missing. Post-launch, we provide 90 days of data quality support and resolve any edge cases that emerge as clinicians start using the unified patient view.

Technology Stack

HAPI FHIR / Google Cloud Healthcare API

FHIR R4 server for canonical data storage

Apache NiFi / AWS Glue

ETL orchestration for data transformation

Python / node-hl7-client

HL7 v2 message parsing and FHIR conversion

PostgreSQL / BigQuery

Unified data warehouse for analytics

UMLS / VSAC

Clinical terminology normalization (LOINC, SNOMED, ICD-10)

Dedupe.io / Record Linkage Toolkit

Probabilistic patient matching algorithms

DataDog / CloudWatch

Pipeline monitoring and data quality alerting

Real-World Example

A 7-location primary care network acquired 3 independent practices, each running different EHR systems (Epic, Athena, and a custom-built PM). Patient data was siloed across all three systems, and providers had no unified view of patient history. Lab results from the Athena clinics weren't visible in Epic, and duplicate patient records were causing claim denials due to mismatched insurance IDs. We built a FHIR-based data unification pipeline that extracted patient, encounter, and clinical data from all three EHRs, normalized it into FHIR R4 resources, and stored it in a centralized HAPI FHIR server. We implemented probabilistic patient matching that identified 1,200+ duplicate records across systems and provided a web interface for billing staff to review and merge them. For ongoing data sync, we deployed HL7 v2 listeners that consumed real-time ADT feeds from Epic and Athena and updated the FHIR server automatically. The practice now has a unified patient search tool that queries all three systems simultaneously, and providers can see complete patient history regardless of which clinic the patient originally visited. Duplicate patient records dropped by 85%, and claim denial rates improved by 12% due to accurate insurance matching.

Frequently Asked Questions

Common questions about data interoperability (hl7/fhir)

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