Instead of another master’s, why not look for a certificate in finance? A whole master’s in finance may repeat a lot of the business coursework you’ve already taken, and it sounds like your interests still intersect pretty heavily with healthcare. Not only can you probably do a certificate (online or in person) while you work full time, it’ll cheaper and take less time, and you might even get your employer to pay for it.
UC Berkeley has an online certificate in finance (http://extension.berkeley.edu/cert/finance.html) as does Harvard’s Extension school (https://www.extension.harvard.edu/academics/professional-graduate-certificates/corporate-finance-certificate), UW Seattle (https://www.pce.uw.edu/certificates/computational-finance), Cornell (http://www.ecornell.com/certificates/financial-management/financial-management/), UCLA (http://business.uclaextension.edu/finance/finance-certficate/), and Boston University (http://www.bu.edu/met/programs/graduate/financial-markets-institutions-certificate/).
There are also U.S. schools that have one-year MSFs, like UT-Austin, Notre Dame, MIT, Vanderbilt, Princeton, George Washington, Wash U in St. Louis, Indiana.