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17. Health Care Service
Health Care Service
2007 revenue: $14.3 billion
Fiscal year end: Dec. 31
2007 Employees: 16,500
Industry: Health care: Insurance
CEO: Raymond F. McCaskey
Location: Chicago, Ill.

The customer-owned health benefits provider operates through its Blue Cross and Blue Shield divisions in Illinois, New Mexico, Oklahoma, and Texas,

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Last updated May 28 2008: 12:40 PM ET