Physicians participating in Medicare managed care plans are increasingly sharing in the financial risks of providing care to enrollees. Although capitation payments are calculated to reflect the average costs for an entire patient panel, there is typically great variation among patients, from healthy individuals to patients requiring high volume and high-cost care. To be successful, physicians must identify high-risk seniors, develop care plans to maintain health and functioning, and monitor health status and ongoing care and treatment. Techniques for performing a comprehensive geriatric assessment include written questionnaires and interviews during office appointments. The goal is to evaluate each patient's health status, medical risk factors, psychosocial profile, cognitive capacities, and functional capabilities and limitations. After frail and at-risk seniors are identified, the physician must collaborate with the case manager, geriatric nurse practitioner, other caregivers, and the patient and family members to initiate and maintain effective care management.