NHG Referentiemodel
Drupal 7 to 10+ Migration
Critical healthcare platform managing medical coding tables and reference models used by professionals across the Netherlands
Healthcare IT Standards
NHG Referentiemodel is a Dutch healthcare IT body managing medical coding tables and reference models used by professionals across the Netherlands. The platform is critical infrastructure for healthcare data standardization.
Medical Coding Platform
Upgrade from Drupal 7 to Drupal 10+ with strict constraints on data integrity, uptime, compliance, and healthcare-specific workflows. The migration required zero tolerance for data loss across over 100 medical coding tables.
Migration Approach
Reviewing the Medical Stack
Assessed legacy database, viewers, and reference tools tied to healthcare coding workflows. A comprehensive audit identified all dependencies and integration points.
Automated Migration Design
Built AI-powered pipelines to transform structure, migrate data, and retain all business logic. Custom scripts ensured complete fidelity of medical coding relationships.
Maintaining Coding Tool Access
Focused on preserving access to online viewers, coding tables, and APIs. Healthcare professionals continued their work without interruption throughout the migration process.
Live System Delivery with No Downtime
Staged rollouts to mirror production closely, tested full functionality before switch-over. The entire switch was completed during low-traffic hours with less than one hour of downtime.
Visual and Functional QA
Used automated screenshot diffs, table audits, and manual review by actual healthcare staff to verify stability and usability. Every coding table was validated for complete accuracy.
Healthcare Compliance
All reference tools passed healthcare QA protocols. The upgraded platform includes current security patches and maintains full compliance with Dutch healthcare IT standards.
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 across over 100 medical coding tables, ensuring healthcare professionals can continue to rely on accurate reference data.
Migration by the Numbers
Data loss verified across 100+ coding tables
Downtime during switch-over
Lower maintenance costs post-upgrade
Healthcare QA compliance
Functionality loss across all systems
NHG Referentiemodel required an exceptionally careful approach due to its role in Dutch healthcare infrastructure. Medical coding accuracy is non-negotiable - every table, every relationship, every viewer had to work exactly as before. We implemented comprehensive data audits at every stage and worked closely with healthcare staff to validate the results. The fact that we achieved zero data loss across over 100 coding tables while maintaining near-zero downtime demonstrates our commitment to mission-critical migrations.
Niels de Feyter
Founder of CodeLift
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