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Outcomes from Converting HL7 v2.x Tables to Codesystems and Value Sets (Represented in FHIR)
1IT Consulting in Healthcare, Mülheim, Germany.
Studies in Health Technology and Informatics
|May 23, 2026
Summary
This study addresses inconsistencies in healthcare data by migrating HL7 version 2.x tables to FHIR value sets. Findings reveal foundational errors in legacy data maintenance, necessitating normative updates for improved interoperability.
Area of Science:
- Health Informatics
- Computer Science
Background:
- Legacy healthcare data standards, such as HL7 version 2.x, use simple tables for vocabulary, leading to inconsistencies when converted to modern standards like FHIR (Fast Healthcare Interoperability Resources).
- The HL7 v2 tables project (2010-2017) aimed to address these issues, focusing on migrating tables to FHIR CodeSystem and ValueSet, while considering semantic versioning.
Purpose of the Study:
- To summarize findings from the HL7 v2 tables project.
- To identify and rectify foundational errors in HL7 v2 vocabulary maintenance.
- To facilitate the migration of HL7 v2 tables to FHIR CodeSystem and ValueSet.
Main Methods:
- Utilized a database containing HL7 v2 vocabulary content.
- Employed SQL and PHP scripting for content investigation and analysis.
- Examined the HL7 v2 tables project findings from 2010-2017.
Main Results:
- Identified numerous foundational errors in the maintenance of HL7 v2 vocabulary tables.
- Revealed inconsistencies arising from the conversion of HL7 v2 tables to FHIR codesystems and value sets.
- Documented issues to prevent future mismanagement of healthcare data vocabulary.
Conclusions:
- The identified vocabulary problems require normative updates to be effectively resolved.
- Standardizing HL7 v2 tables into FHIR value sets is crucial for semantic consistency.
- Addressing these errors will improve healthcare data interoperability and accuracy.
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