Harvard Vanguard’s credit status improves

Harvard Vanguard Medical Associates, the largest physicians practice in Massachusetts not affiliated with a hospital, says it has been able to free up about $15 million that was set aside as collateral for a line of credit with Bank of America Corp. The group said it no longer has to keep the cash on hand to secure a $32 million line of credit with the bank, giving it greater flexibility as it looks to invest $30 million annually in facilities and equipment over the next five years.