People who do not have health insurance often seek health care services later and receive less care than people who do have coverage. Most federal and state initiatives aimed at improving access to care have focused on extending insurance coverage. These programs have been developed with the recognition that, although most adults between the ages of 18 and 64 are enrolled in private health insurance plans, coverage is less likely to be provided by certain types of firms and to low-wage workers. Moreover, not all states are equally ambitious in their attempts to fill gaps in private coverage. As a result, health insurance coverage of nonelderly adults varies widely across the nation.