ERISA Preemption. State-Law Negligence/Medical Malpractice Claims Based On Denial of Treatment Coverage. The Employee Retirement Income Security Act of 1974 ("ERISA"), 29 U.S.C. § 1001 <I>et seq</I>., which regulates employee benefit plans, including HMO and managed care plans, completely preempts certain state-law claims. The Supreme Court granted certiorari in and consolidated two cases, <I>Aetna Health Inc. </I>v. <I>Davila</I>, No. 02-1845, and <I>Cigna HealthCare of Texas, Inc. </I>v. <I>Ca