The IRS denied a commercial accountable care organization tax-exempt status earlier this year -- though ACOs participating in the Medicare Shared Savings Program are eligible for tax-exempt charitable status -- and some say the decision raises questions about how different types of ACOs are treated as far as their tax status. The global law firm Dentons penned a memo to the National Association of ACOs saying “[i]t is clear that the IRS will not grant tax exempt status to an...