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Home > Case Study Main > Case study Hartford

How a Leading Health System Scaled from HL7 to FHIR and Activated Real-Time Decision Hubs with WellStack

Unifying Data. Unlocking Insight. Transforming Care.

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About Hartford HealthCare

An integrated health network with seven hospitals and 400+ sites of care across Connecticut, delivering services to more than 1.7 million patients annually.

Overview

As part of its enterprise-wide digital transformation, a Connecticut based health system partnered with WellStack to modernize its data architecture & accelerate time-to-insight.

The result: a scalable, FHIR-enabled platform powering real-time decision-making across 2.7M+ patient lives.

The Challenge

The health system faced mounting pressure to unify fragmented data, meet FHIR compliance, & enable intelligent, patient-centered analytics.

Key challenges included:

Disconnected clinical, operational, and financial systems

Slow, manual pipelines hindering timely insight

Lack of interoperability with FHIR standards

Difficulty in tracking quality and population health metrics

WellStack Solution

Modern, Modular, AI-Ready

WellStack delivered a modular, cloud-native platform deployed on Google Cloud, aligned with the client’s healthcare data strategy:

FHIR Integration

HL7, flat file, and Epic data standardized into BigQuery, then transformed to FHIR using Google Healthcare Data Engine.

Decision Hubs

Population Health, Quality, and Financial dashboards activated using WellStack’s Metric & Cohort Builders for self-service analytics.

Transformation Outcomes

2.7M+
patient records

unified in FHIR

95%+
FHIR data validation
achieved across domains

Seamless
HL7-to-FHIR
automation at scale

Time-to-insight
reduced from weeks to minutes

Decision Hubs activated across
Finance, Quality
and Population Health

Delivered
within existing architecture strategy

Impact Highlights

The engagement delivered tangible improvements across key performance areas—enabling smarter decisions, faster insights, and better outcomes system-wide.

Area

Result

Denial Reduction

Root-cause analytics on claims

Readmission Management

Real-time tracking and early alerts

Quality Performance

HEDIS & internal KPIs integrated

Population Health

High-risk cohort stratification

IT Efficiency

Manual processes replaced with automation

WellStack offers healthcare organizations a modern, out-of-the-box data ecosystem that creates a single source of truth necessary for enterprise-wide decision-making.

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