Healthcare System Cloud Migration Architecture

Client Context

A regional health system operating twelve hospitals and two hundred clinics needed a HIPAA-aligned cloud target architecture while Epic remained the clinical system of record. Larkinized partnered with the CIO, chief medical information officer, and cloud center of excellence formed eighteen months prior.

Challenge

Workload eligibility for cloud was debated clinically and legally—imaging PACS, analytics lakes, and administrative SaaS had inconsistent risk classifications. Shadow IT SaaS purchases bypassed architecture review. Datacenter contracts expired within twenty-four months, creating forced migration pressure without a prioritized wave plan.

Approach

We mapped critical clinical services to applications and data classes, then defined landing zones with BAA-covered Azure regions. Clinical informatics workshops validated which workflows could tolerate cloud latency. Phased waves started with administrative analytics, not perioperative systems. Discovery-fed inventory in LeanIX linked accounts to application owners with survey accountability.

Architecture Decisions

Hybrid architecture standard: Epic integration via dedicated connectivity; PHI in approved services only; break-glass access patterns documented. API standards for patient-facing apps; prohibition on long-lived credentials in serverless. Transition architecture kept read replicas on-prem for peak flu season surge.

Outcomes

Eighty-five percent of eligible workloads migrated in twenty-four months with zero HIPAA findings tied to architecture governance. Infrastructure operating cost fell thirty percent net of cloud spend. Clinical leadership endorsed wave sequencing because informatics co-owned criteria—not IT alone.

Lessons Learned

Clinical co-design is non-negotiable in health cloud programs. Tagging and BAA diligence before migration waves prevents emergency pullbacks. Start with workloads clinicians do not perceive as bedside-critical to build trust.