Expanded health insurance benefits for the treatment of mental illness have obliged psychiatrists to devote more time to justifying psychiatric treatment to claims reviewers. The author, drawing from experience in utilization review and peer review, summarizes factors contributing to the denial of payment for psychiatric services by health insurers, and gives practical advice on protecting against claims denials and on the process of appealing denials. Psychiatrists should make greater use of peer review committees to justify legitimate treatment services in the face of claims denials. Greater coverage for psychiatric treatment under national health insurance will increase the psychiatrist's responsibility for public accountability. This accountability will require better communication between psychiatrists and claims reviewers.