API:  http://id.who.int/icd/release/10/2016/N21
{
    "@context": "http://id.who.int/icd/contexts/contextForICD10Entity.json",
    "@id": "http://id.who.int/icd/release/10/2016/N21",
    "parent": [
        "http://id.who.int/icd/release/10/2016/N20-N23"
    ],
    "child": [
        "http://id.who.int/icd/release/10/2016/N21.0",
        "http://id.who.int/icd/release/10/2016/N21.1",
        "http://id.who.int/icd/release/10/2016/N21.8",
        "http://id.who.int/icd/release/10/2016/N21.9"
    ],
    "browserUrl": "http://apps.who.int/classifications/icd10/browse/2016/en#/N21",
    "code": "N21",
    "title": {
        "@language": "en",
        "@value": "Calculus of lower urinary tract"
    },
    "inclusion": [
        {
            "label": {
                "@language": "en",
                "@value": "with cystitis and urethritis"
            }
        }
    ],
    "classKind": "category"
}