Updated

Citing an effort to hold down costs, health insurance giant Blue Cross wants doctors in California to report conditions it could use to cancel new patients' medical coverage, it was reported Tuesday.

The state's largest for-profit health insurer is sending physicians copies of health insurance applications filled out by new patients, along with a letter advising them that the company has a right to drop members who fail to disclose "material medical history," the Los Angeles Times reported on its Web site.

"Any condition not listed on the application that is discovered to be pre-existing should be reported to Blue Cross immediately," according to the letter obtained by the newspaper.

One of the conditions noted in the letter that could force a new patient to be dropped by Blue Cross — pre-existing pregnancies.

WellPoint Inc., the Indianapolis-based company that operates Blue Cross of California, said it was sending out the letters in an effort to keep costs at a minimum.

"Enrolling an applicant who did not disclose their true condition (and the condition is chronic or acute), will quickly drive increased utilization of services, which drives up costs for all members," WellPoint spokeswoman Shannon Troughton said in an e-mail to the newspaper.

"Blue Cross feels it is our responsibility to assure all records are accurate and up to date for HMO providers," she said. "We send these letters to identify members early on in the process who may not have been honest in their application."

Troughton added doctors are not required, but rather can volunteer, patients' information to Blue Cross.

Doctors were unhappy about the letter, warning that some patients might hide any medical history that could affect their prospects of receiving health insurance.

"We're outraged that they are asking doctors to violate the sacred trust of patients to rat them out for medical information that patients would expect their doctors to handle with the utmost secrecy and confidentiality," said Dr. Richard Frankenstein, president of the California Medical Association.