President Obama’s landmark health-care initiative, long touted as a means to control costs, will actually add more than $340 billion to the nation’s budget woes over the next decade, according to a new study by a member of the board that oversees Medicare financing.

The study is set to be released Tuesday by Charles Blahous, a conservative policy analyst whom Obama appointed in 2010 as one of two public trustees for Medicare and Social Security. His analysis challenges the conventional wisdom that the health-care law, which calls for an expensive expansion of coverage for the uninsured beginning in 2014, will nonetheless reduce deficits by raising taxes and cutting payments to Medicare providers. …

“Does the health-care act worsen the deficit? The answer, I think, is clearly that it does,” Blahous, a senior research fellow at George Mason University’s Mercatus Center, said in an interview. “If one asserts that this law extends the solvency of Medicare, then one is affirming that this law adds to the deficit. Because the expansion of the Medicare trust fund and the creation of the new subsidies together create more spending than existed under prior law.”