Health insurers in California refuse to sell individual coverage to people simply because of their occupations or use of certain medicines, according to documents obtained by The Times.

Entire categories of workers , including roofers, pro athletes, dockworkers, migrant workers and firefighters , are turned down for insurance even if they are in good health and can afford coverage, according to the confidential underwriting guidelines of four health plans.

Although Blue Cross of California, the state’s top seller of individual policies, does not exclude applicants based on occupation, three others do: Blue Shield of California, PacifiCare Health Systems Inc. and Health Net Inc. Actuarially speaking, they say, certain workers pose too big a risk.

All four health plans look at prescription drug use to decide to whom they will sell individual policies. Dozens of widely prescribed medications , including Allegra, Celebrex and Prevacid , may lead to rejection, according to the underwriting guidelines that the health plans provide to insurance brokers but not to the public.

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