(a) The employee is entitled to receive all medical services, appliances or supplies which a qualified physician prescribes or recommends and which OWCP considers necessary to treat the work-related injury. The employee need not be disabled to receive such treatment. If there is any doubt as to whether a specific service, appliance or supply is necessary to treat the work-related injury, the employee should consult OWCP prior to obtaining it.
(b) Any qualified physician or qualified hospital may provide such services, appliances and supplies. A qualified provider of medical support services may also furnish appropriate services, appliances, and supplies. OWCP may apply a test of cost-effectiveness to appliances and supplies. With respect to prescribed medications, OWCP