(January 12, 2016, 11:21 AM EST) -- ATLANTA — An out-of-network provider lacks standing under the Employee Retirement Income Security Act to bring claims for underpayment of benefits because the plans’ anti-assignment provisions are unambiguous, the 11th Circuit U.S. Court of Appeals ruled Dec. 29 and Dec. 30 in four unpublished opinions (W. A. Griffin, MD v. Focus Brands Inc., No. 15-12137, 11th Cir.; 2015 U.S. App. LEXIS 22794; W.A. Griffin, MD v. Southern Company Services, Inc., No. 15-12135, 11th Cir.; 2015 U.S. App. LEXIS 22797; W.A. Griffin, MD v. General Mills, Inc., No. 15-12157, 11th Cir.; 2015 U.S. App. LEXIS 22774; W. A. Griffin, MD v. Health Systems Management, Inc., No. 15-12138, 11th Cir.; 2015 U.S. App. LEXIS 22780)....