This is the CodeSystem that contains all the codes in NHSN Healthcare Facility Patient Care Location (https://www.cdc.gov/nhsn/cdaportal/terminology/codesystem/hsloc.html) and NHSN Healthcare Facility Patient Care Location (https://www.cdc.gov/nhsn/cdaportal/terminology/codesystem/hsloc.html). E.g. what you have to deal with if you get resources containing codes in either of them