API:  http://id.who.int/icd/release/10/2019/K20-K31
{
    "@context": "http://id.who.int/icd/contexts/contextForICD10Entity.json",
    "@id": "http://id.who.int/icd/release/10/2019/K20-K31",
    "parent": [
        "http://id.who.int/icd/release/10/2019/XI"
    ],
    "child": [
        "http://id.who.int/icd/release/10/2019/K20",
        "http://id.who.int/icd/release/10/2019/K21",
        "http://id.who.int/icd/release/10/2019/K22",
        "http://id.who.int/icd/release/10/2019/K23",
        "http://id.who.int/icd/release/10/2019/K25",
        "http://id.who.int/icd/release/10/2019/K26",
        "http://id.who.int/icd/release/10/2019/K27",
        "http://id.who.int/icd/release/10/2019/K28",
        "http://id.who.int/icd/release/10/2019/K29",
        "http://id.who.int/icd/release/10/2019/K30",
        "http://id.who.int/icd/release/10/2019/K31"
    ],
    "browserUrl": "http://apps.who.int/classifications/icd10/browse/2019/en#/K20-K31",
    "code": "K20-K31",
    "title": {
        "@language": "en",
        "@value": "Diseases of oesophagus, stomach and duodenum"
    },
    "exclusion": [
        {
            "label": {
                "@language": "en",
                "@value": "hiatus hernia"
            }
        }
    ],
    "classKind": "block"
}