API:  http://id.who.int/icd/release/10/2019/M54
{
    "@context": "http://id.who.int/icd/contexts/contextForICD10Entity.json",
    "@id": "http://id.who.int/icd/release/10/2019/M54",
    "parent": [
        "http://id.who.int/icd/release/10/2019/M50-M54"
    ],
    "child": [
        "http://id.who.int/icd/release/10/2019/M54.0",
        "http://id.who.int/icd/release/10/2019/M54.1",
        "http://id.who.int/icd/release/10/2019/M54.2",
        "http://id.who.int/icd/release/10/2019/M54.3",
        "http://id.who.int/icd/release/10/2019/M54.4",
        "http://id.who.int/icd/release/10/2019/M54.5",
        "http://id.who.int/icd/release/10/2019/M54.6",
        "http://id.who.int/icd/release/10/2019/M54.8",
        "http://id.who.int/icd/release/10/2019/M54.9"
    ],
    "browserUrl": "http://apps.who.int/classifications/icd10/browse/2019/en#/M54",
    "code": "M54",
    "title": {
        "@language": "en",
        "@value": "Dorsalgia"
    },
    "exclusion": [
        {
            "label": {
                "@language": "en",
                "@value": "psychogenic dorsalgia"
            }
        }
    ],
    "classKind": "category"
}