For Member Services, call 1-888-274-2207; TTY: 1-800-349-3538.  Member Services hours:  From March 2 through November 14, we are open Monday - Friday from 8 am to 8 pm.  Calls on Saturday, Sunday and holidays will be received by our automated phone system (where you can leave a detailed message and a representative will return your call as soon as possible).  From  November 15 through March 1, we are open seven days a week from 8 am to 8 pm. 

Sierra Optima is not affiliated with Optima Health in Virginia. Sierra Optima Medicare Advantage Private Fee-for-Service plans are offered by Sierra Health and Life Insurance Company, Inc., a UnitedHealthcare Company.  Sierra Health and Life Insurance Company, Inc. is a health plan with a Medicare contract.  Anyone with Medicare Parts A & B may apply.  You must continue to pay your Medicare Part B premium. Prescription coverage subject to limitations. A Medicare Advantage Private Fee-for-Service plan works differently than a Medicare supplement plan.  Your doctor or hospital can continue to treat you if it agrees to accept our terms and conditions of payment, and thus may choose not to treat you, with the exception of emergencies.  If your doctor or hospital does not agree to accept our payment terms and conditions, they may choose not to provide health care services to you, except in emergencies.  Providers can find the plan's terms and conditions on this website.