Case Study: Drupal 7 to Drupal 10+ Upgrade
Critical Healthcare Platform Upgraded from Drupal 7 to 10+
NHG Referentiemodel manages medical coding tables and reference models used by professionals across the Netherlands
https://referentiemodel.nhg.orgHealthcare IT Standards
NHG Referentiemodel is a Dutch healthcare IT body managing medical coding tables and reference models used by professionals across the Netherlands.
Medical Coding Platform
Upgrade from Drupal 7 to Drupal 10+ with strict constraints on data integrity, uptime, compliance, and healthcare-specific workflows.
The Approach
Reviewing the Medical Stack
Assessed legacy database, viewers, and reference tools tied to healthcare coding workflows.
Automated Migration Design
Built AI-powered pipelines to transform structure, migrate data, and retain all business logic.
Maintaining Coding Tool Access
Focused on preserving access to online viewers, coding tables, and APIs.
Live System Delivery with No Downtime
Staged rollouts to mirror production closely, tested full functionality before switch-over.
Visual and Functional QA with Real Users
Used automated screenshot diffs, table audits, and manual review by actual healthcare staff to verify stability and usability.
Mission-Critical System Upgrade
Full migration to Drupal 10+ with zero loss of functionality. All medical coding systems and viewer tools retained. The platform stayed operational during the upgrade. Post-upgrade maintenance was simplified. Data audits showed full parity.
Key Matrics
- 0% Data Loss: Verified across over 100 medical coding tables
- <1hr Downtime: Entire switch completed during low-traffic hours
- 30% Lower Maintenance Costs post-upgrade
- Full Compliance: All reference tools passed healthcare QA protocols
- Zero functionality loss across all systems