API:  http://id.who.int/icd/release/10/2019/B18.1
{
    "@context": "http://id.who.int/icd/contexts/contextForICD10Entity.json",
    "@id": "http://id.who.int/icd/release/10/2019/B18.1",
    "parent": [
        "http://id.who.int/icd/release/10/2019/B18"
    ],
    "child": [
        "http://id.who.int/icd/release/10/2019/B18.10",
        "http://id.who.int/icd/release/10/2019/B18.19"
    ],
    "browserUrl": "http://apps.who.int/classifications/icd10/browse/2019/en#/B18.1",
    "code": "B18.1",
    "title": {
        "@language": "en",
        "@value": "Chronic viral hepatitis B without delta-agent"
    },
    "inclusion": [
        {
            "label": {
                "@language": "en",
                "@value": "Hepatitis B (viral) NOS"
            }
        }
    ],
    "classKind": "category"
}
Title: Chronic viral hepatitis B without delta-agent
Code:  B18.1

Child

1.  http://id.who.int/icd/release/10/2019/B18.10
2.  http://id.who.int/icd/release/10/2019/B18.19