Demographics (name, DOB) are visible by default. The MRN field lives on the Insurance tab, which isn't mounted until a user clicks it. Use ?tab=insurance to open it directly (clean case). A STATIC or XPath selector targeting the MRN field resolves to zero matches while the Insurance tab is closed — the data isn't missing, it just isn't on screen yet.
{
"action": "EXTRACT_DATAMODEL",
"parameters": {
"execution": "LLM_DOM",
"extract_data_model": {
"type": "object",
"properties": {
"name": { "type": "string" },
"dob": { "type": "string" },
"mrn": { "type": "string" }
}
}
}
}