A company that operates its home office in the state where it is organized is known in that state as a domestic company.  In any other states where they do business the company is considered a foreign company.  If the home office of a company is located outside the United States, it is considered an alien company.  No matter whether it is domestic, foreign or alien a company must be registered in every state in which they operate.

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Blue Cross/Blue Shield 

These service organizations represent producers cooperatives.   Hospitals and physicians who sponsor Blue Cross/Blue Shield plans are providing the insurance, therefore they are considered to be the producers of the cooperative.

Originally Blue Cross and Blue shield were separate voluntary and tax-exempt associations.  Blue Cross provided payments to hospitals and Blue Shield covered physicians, medical and surgical fees.  People originally covered under these plans were traditionally known as subscribers since Blue Cross and Blue shield differ from traditional insurance companies.