What I make of it
Not a model itself — the crosswalk between ~200 of them. Structurally interesting for this catalog.
UMLS Metathesaurus (Unified Medical Language System)
Code System
Healthcare
openly published
The UMLS integrates and distributes key terminology, classification and coding standards, and associated resources to promote creation of more effective and interoperable biomedical information systems and services, including electronic health records....
Other healthcare data models
HL7 CDA / C-CDA
Exchange Schema
CPT and HCPCS (Current Procedural Terminology)
Code System
Da Vinci Project Implementation Guides
Exchange Schema
DICOM
Information Model
DOID (Human Disease Ontology)
Ontology / Vocabulary
HL7 FHIR
Exchange Schema
HL7 RIM (Reference Information Model)
Information Model
HL7 Version 2
Exchange Schema
i2b2 star schema
Information Model
ICD-11 (International Classification of Diseases)
Code System
ICF (International Classification of Functioning)
Code System
IHE Technical Frameworks and Profiles
Exchange Schema