{
  "package" : "us.nlm.vsac@0.21.0",
  "definition" : null,
  "system" : "https://www.cdc.gov/nhsn/cdaportal/terminology/codesystem/cdcnhsn.html",
  "property" : [ ],
  "codesystem" : "078444ba-7844-5424-a8ae-aaa5dd3908d0",
  "concept_id" : "25b1f6be-f3ba-59c5-a720-27db698fa080",
  "ancestors" : {
    "1877-0" : 0
  },
  "id" : "c7f2365c-60e5-4b5b-9f85-741085a6f666",
  "code" : "1877-0",
  "display" : "Number of prevalent cases previously known",
  "version" : "2023-04"
}