The Berenson-Eggers Type of Service (BETOS) system is a way to group healthcare services into categories like tests, procedures, and visits. The BETOS meaning is to help Medicare, researchers, and policymakers track medical spending and compare how resources are used. In medicine, it is often used to study trends in costs and the types of care patients receive.
Source
Berenson-Eggers Type of Service (BETOS) Codes. Centers for Medicare and Medicaid Service. https://www.cms.gov/Research-Statistics-Data-and-Systems/Statistics-Trends-and-Reports/MedicareFeeforSvcPartsAB/downloads/BETOSDescCodes.pdf