The Impact of Access Regulation on Health Insurance Market Structure

TABLE 6
NUMBER OF INSURERS WRITING GROUP MAJOR MEDICAL INSURANCE AND PERCENT OF MARKET HELD BY TYPE OF INSURER: 1995-1997^a

Type of Insurer	1995	1996	1997	Percent Change, 1995-1997
Number of Insurers
BCBSb	136	130	143	5.1
Commercial Insurers	1744	1764	1721	-1.3
HMOs	482	577	588	22.0
Total	2362	2471	2452	3.4
Market Share
BCBSa	38.7	36.5	36.3	-2.4c
Commercial Insurers	19.3	18.1	18.9	-0.4c
HMOs	41.9	45.3	44.8	2.9c
Total	100.0	100.0	100.0	--

a - Data include the District of Columbia and all states except Hawaii. bIncludes BCBS HMOs. CPercentage points.