How much detail can an expert be compelled to disclose in a medical malpractice case?

Thus in Allen, the court took some care in limiting the level of detail an expert may be compelled to disclose: "To show bias or prejudice, real party need not learn the details of his billing and accounting or the specifics of his prior testimony and depositions. As petitioner points out, publications which index the testimony of medical units are available to real party. Exact information as to number of cases and amounts of compensation paid to medical experts is unnecessary for the purpose of showing a bias." (Allen v. Superior Court, supra, 151 Cal.App.3d at p. 453.)