"With respect to weight-management counseling, plan sponsors may want to develop custom programs with discounted provider network services, clear clinical management rules, and protocols and reporting tools to make sure care is appropriate and help manage costs. In addition to implementing the preventive services benefits operationally, it is important to have documentation of the benefit, both so that plan participants can understand their coverage and that the plan sponsor can demonstrate the benefit if audited by the [DOL] or [CMS]."