We have a set of open source tools to transform common code systems to FHIR e.g. OWL and CLAML
A stand-alone command-line tool transfers various clinical terminology and code set resources into FHIR codes systems and concept maps.
This Spring Boot CLI application transforms a ClaML classification into a FHIR Code System.
This Spring Boot CLI application transforms a collection of HGNC source files into FHIR code systems.
This Spring Boot CLI application transforms an OWL ontology into FHIR terminology resources.