API:  http://id.who.int/icd/release/10/2008/R03
{
    "@context": "http://id.who.int/icd/contexts/contextForICD10Entity.json",
    "@id": "http://id.who.int/icd/release/10/2008/R03",
    "parent": [
        "http://id.who.int/icd/release/10/2008/R00-R09"
    ],
    "child": [
        "http://id.who.int/icd/release/10/2008/R03.0",
        "http://id.who.int/icd/release/10/2008/R03.1"
    ],
    "browserUrl": "http://apps.who.int/classifications/icd10/browse/2008/en#/R03",
    "code": "R03",
    "title": {
        "@language": "en",
        "@value": "Abnormal blood-pressure reading, without diagnosis"
    },
    "classKind": "category"
}
Title: Abnormal blood-pressure reading, without diagnosis
Code:  R03

Child

1.  http://id.who.int/icd/release/10/2008/R03.0
2.  http://id.who.int/icd/release/10/2008/R03.1