API:  http://id.who.int/icd/release/10/2010/I26-I28
{
    "@context": "http://id.who.int/icd/contexts/contextForICD10Entity.json",
    "@id": "http://id.who.int/icd/release/10/2010/I26-I28",
    "parent": [
        "http://id.who.int/icd/release/10/2010/IX"
    ],
    "child": [
        "http://id.who.int/icd/release/10/2010/I26",
        "http://id.who.int/icd/release/10/2010/I27",
        "http://id.who.int/icd/release/10/2010/I28"
    ],
    "browserUrl": "http://apps.who.int/classifications/icd10/browse/2010/en#/I26-I28",
    "code": "I26-I28",
    "title": {
        "@language": "en",
        "@value": "Pulmonary heart disease and diseases of pulmonary circulation"
    },
    "classKind": "block"
}
Title: Pulmonary heart disease and diseases of pulmonary circulation
Code:  I26-I28

Child

1.  http://id.who.int/icd/release/10/2010/I26
2.  http://id.who.int/icd/release/10/2010/I27
3.  http://id.who.int/icd/release/10/2010/I28