Conversion of Data to the OMOP CDM
The OMOP-CDM structures and harmonizes patient-level data, including
details of visits with health care services, diagnoses, medical
procedures, drugs, and laboratory test results, and de-identifies
clinical content. A diagnosis record consists of a patient identifier,
the date of diagnosis, a code for the diagnosis, and the mapping and
coding system (International Classification of Diseases, Tenth Revision
[ICD-10]) to the OMOP-CDM Standardized
Vocabularies.20 In this mapping process, the
Systematic Nomenclature of Medicine (SNOMED) is used as the target
vocabulary for diagnostic codes, RxNorm for drugs, and Logical
Observation Identifiers Names and Codes for other observations, such as
laboratory results and measurements of vital signs.19