Cloud EHR vs. On-Premise EHR

Where the software actually runs.

Cloud EHR (SaaS): platform runs in vendor's cloud infrastructure. Practice accesses it through web browser or thin client. Vendor handles servers, databases, backups, platform upgrades, security patching, and most infrastructure operations. Practice handles endpoints, local network, practice-specific cybersecurity, and integrations with non-EHR systems.

On-premise EHR: platform runs on servers physically located at the practice (or in a practice-rented data center). Practice handles servers, database administration, backups (including offsite replication for disaster recovery), platform upgrades, security patching, infrastructure scaling, and all operational responsibility.

Hybrid — some deployments combine elements, typically cloud application access with some on-premise components for specific integrations or regulatory reasons.

Where each model fits.

IT operational burden

Cloud substantially lower — no server maintenance, no database administration, no platform upgrades for the practice to manage. On-premise has substantial IT burden; practices without dedicated IT expertise typically underperform on-premise operations. For practices without IT capability, cloud is nearly always the right answer.

Cost structure

Cloud is subscription-based (operating expense). On-premise has higher upfront capital cost plus ongoing infrastructure and labor costs. 5-year TCO often favors cloud for small-to-mid practices; very large practices with existing infrastructure and IT capability can sometimes justify on-premise economics.

Security and compliance

Cloud vendors invest heavily in infrastructure security — typically stronger than what individual practices deploy on-premise. But cloud also introduces vendor dependency and BAA relationship complexity. On-premise provides direct control but requires the practice to actually execute security well. For HIPAA compliance both models can achieve compliance; operational execution differs.

Internet dependency

Cloud requires reliable internet — when internet is down, EHR is inaccessible. Practices operating cloud EHR need redundant internet (SD-WAN with dual ISPs) for operational continuity. On-premise continues operating during internet outages but has its own failure modes (server issues, power outages, etc.).

Customization and integration

On-premise historically allowed deeper customization; cloud platforms have closed most of this gap through extensive API infrastructure and configurability. For most practice needs, cloud customization is sufficient. For unusual integration requirements, on-premise retains some advantages.

How major platforms deploy.

Cloud-native: athenahealth (cloud only), NextGen Office (cloud), Modernizing Medicine EMA (cloud).

Both options available: eClinicalWorks, NextGen Enterprise, Allscripts/Veradigm, Greenway. Most are pushing customers toward cloud; on-premise is legacy for these.

Hospital-scale: Epic and Cerner/Oracle Health traditionally on-premise or vendor-hosted; both moving toward cloud architectures.