Latinos' use of health services studied - Research shows those in the U.S. illegally are 50% less likely to visit emergency rooms.

The cost of providing healthcare and other government services to illegal immigrants looms large in the national debate over immigration.

In Los Angeles County, much of the focus of that debate has been on hospital emergency rooms. Ten have closed in the last five years, citing losses from treating the uninsured, and those that remain open are notorious for backlogs.

By federal law, hospitals must treat every emergency, regardless of a person's insurance -- or immigration -- status. Illegal immigrants, who often work at jobs that don't offer health insurance, are commonly seen as driving both the closures and the crowding.

But the study found that while illegal immigrants are indeed less likely to be insured, they are also less likely to visit a doctor, clinic or emergency room.

"The current policy discourse that undocumented immigrants are a burden on the public because they overuse public resources is not borne out with data, for either primary care or emergency department care," said Alexander N. Ortega, an associate professor at UCLA's School of Public Health and the study's lead author. "In fact, they seem to be underutilizing the system, given their health needs."

Ira Mehlman, media director for the Federation for American Immigration Reform, a group that lobbies for tougher immigration controls, said that usage rates are just one measure of illegal immigrants' effect on healthcare. The other factor, he said, is the cost to taxpayers, which Ortega's study did not examine.

Cost estimates vary widely. A Rand Corp. study published last year in the journal Health Affairs put the cost of healthcare for illegal immigrants nationwide at $1.1 billion a year, excluding care for those younger than 18 and older than 64.

FAIR called the Rand number a "low-ball" estimate. Its own study of healthcare costs of illegal immigrants and their dependents, including U.S.-born children, estimated California's portion alone to be about $1.5 billion a year.

Mehlman said $1.5 billion "is still a significant amount of money, unless you're Bill Gates."