Small group reform in a competitive managed care market: the case of California, 1993 to 1995.

State-level insurance reforms designed to make health insurance more accessible for small businesses and their employees have become common in the 1990s. This study examines the effects of small group reform legislation enacted in California in 1993. Using survey data on health benefits in small firms, we look at changes in health insurance coverage that occurred between spring 1993 (just before reform) and spring 1995. Our results indicate that insurance became slightly more affordable and, among businesses with three to nine employees, employer provision increased more than 10 percentage points. Provision was unchanged among larger-sized businesses, however. Managed care penetration increased considerably. We argue that California's competitive health insurance market, which already was dominated by managed care, represented a favorable environment for small group reform. In this context, the modest growth in insurance provision highlights the limited potential of incremental reforms for expanding insurance coverage.