| CodeSystem | SOP | https://nahdo.org/sopt | 9.2 |
| CodeSystem | CDCNHSN | https://www.cdc.gov/nhsn/cdaportal/terminology/codesystem/cdcnhsn.html | 2023-04 |
| CodeSystem | HSLOC | https://www.cdc.gov/nhsn/cdaportal/terminology/codesystem/hsloc.html | 2022 |
| CodeSystem | CDCREC | urn:oid:2.16.840.1.113883.6.238 | 1.2 |