@Html.HiddenFor(model => model.PolicyHolderId,
    new Dictionary<string, object>{{ "id", "policyHolderIdHidden"}})

$(document).ready(function () {
    alert($("#policyHolderIdHidden").val());
});

@Html.HiddenFor(model => model.PolicyHolderId,
new Dictionary<string, object>{{ "id", "policyHolderIdHidden"}})

@Html.Hidden("policyHolderIdHidden",
Model.PolicyHolderId, new Dictionary<string, object>{{ "id", "policyHolderIdHidden"}})