President Clinton signed legislation Wednesday that will guarantee health insurance to people who change jobs.

The Health Insurance Portability and Accountability Act extends new protections to an estimated 25 million Americans in so-called "job lock," a situation in which employees don’t switch jobs for fear of losing coverage due to pre-existing medical conditions.

The legislation includes a phased-in 80% tax deduction for health-insurance premiums for the self-employed by 2006, up from the current 30%. It also allows for the creation of 750,000 medical savings accounts that, much like individual retirement accounts or 401(k) savings plans, would enable individuals to set aside tax-free …