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]

10/20/2000

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.