Nearly a million Californians, perhaps hundreds of thousands more, cross the border to Mexico every year because they cannot afford the rising cost of health care in the United States, according to UCLA researchers.

The study by the school's Center for Health Policy Research, published Tuesday in the journal Medical Care, affirms what has long been suspected – that the untamable cost of medicine is forcing many, particularly Latino immigrants, to look outside California for medical and dental care. As casualties from the recession rise and as budget-strapped government programs eliminate health services, more people are expected to head south to fill prescriptions, get teeth fixed or undergo care for chronic illnesses.

According to the study, at least 952,000 California adults – 488,000 of them described by the study as Mexican immigrants and about a quarter as non-Latino whites – head south annually for their medical, dental and prescription services.

The number seeking care in Mexico may actually be much larger, because findings are based on 2001 data from the California Health Interview Survey and do not take into account today's higher rates of unemployment and the increasing rate of the medically uninsured.

"We suspect the number has grown by leaps and bounds," said Gil Ojeda, executive director of the California Program on Access to Care, which is housed at UC Berkeley's School of Public Health.

The recession has left many people out of work and without health insurance. About 6.6 million Californians were medically uninsured in 2007, and Latinos are twice as likely as whites to be without insurance, according to the California HealthCare Foundation.

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