Commentary: Lessons from Medicaid--improving access to office-based physician care for the low-income population.

Medicaid offers important lessons about providing access to office-based physician services for the poor. First, differentials in physician fees between Medicaid and other payers compromise access to care and are difficult to reverse. Second, managed care alone is not enough to attain equity in access, especially if differentials in payment rates between Medicaid and private patients in managed care settings are allowed to grow. Finally, financing strategies alone are not sufficient to resolve the shortage of health care providers in medically underserved areas. In these areas, payment policy must be combined with resource development to ensure that vulnerable populations have access to care.