eHealth Infrastructure (v2019.6.1) 

{
  "resourceType" : "CodeSystem",
  "id" : "ehealth-recommendation-levels",
  "text" : {
    "status" : "generated",
    "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\"><h2>RecommendationLevels</h2><div><p>Recommendation levels (originally for standards)</p>\n</div><p>This code system http://ehealth.sundhed.dk/cs/recommendation-levels defines the following codes:</p><table class=\"codes\"><tr><td style=\"white-space:nowrap\"><b>Code</b></td><td><b>Display</b></td><td><b>Definition</b></td></tr><tr><td style=\"white-space:nowrap\">TBD<a name=\"ehealth-recommendation-levels-TBD\"> </a></td><td>Example value - Under construction</td><td>Example value - Under construction</td></tr></table></div>"
  },
  "url" : "http://ehealth.sundhed.dk/cs/recommendation-levels",
  "version" : "2019.6.1",
  "name" : "RecommendationLevels",
  "status" : "active",
  "experimental" : false,
  "date" : "2019-01-29T00:00:00+00:00",
  "publisher" : "ehealth.sundhed.dk",
  "contact" : [
    {
      "telecom" : [
        {
          "system" : "url",
          "value" : "http://ehealth.sundhed.dk/terminology"
        }
      ]
    }
  ],
  "description" : "Recommendation levels (originally for standards)",
  "caseSensitive" : true,
  "content" : "complete",
  "concept" : [
    {
      "code" : "TBD",
      "display" : "Example value - Under construction",
      "definition" : "Example value - Under construction"
    }
  ]
}