API:  http://id.who.int/icd/release/10/2016/U00-U49
{
    "@context": "http://id.who.int/icd/contexts/contextForICD10Entity.json",
    "@id": "http://id.who.int/icd/release/10/2016/U00-U49",
    "parent": [
        "http://id.who.int/icd/release/10/2016/XXII"
    ],
    "child": [
        "http://id.who.int/icd/release/10/2016/U04",
        "http://id.who.int/icd/release/10/2016/U06",
        "http://id.who.int/icd/release/10/2016/U07"
    ],
    "browserUrl": "http://apps.who.int/classifications/icd10/browse/2016/en#/U00-U49",
    "code": "U00-U49",
    "title": {
        "@language": "en",
        "@value": "Provisional assignment of new diseases of uncertain etiology or emergency use"
    },
    "classKind": "block"
}
Title: Provisional assignment of new diseases of uncertain etiology or emergency use
Code:  U00-U49

Child

1.  http://id.who.int/icd/release/10/2016/U04
2.  http://id.who.int/icd/release/10/2016/U06
3.  http://id.who.int/icd/release/10/2016/U07