1. An implantable microstimulator comprising an hermetically-sealed housing; at least two exposed electrodes extending from said housing; electronic circuitry within said housing coupled to said at least two exposed electrodes for generating electrical current and applying said electrical current to the two exposed electrodes; said microstimulator being of a size and shape capable of implantation by expulsion through a cannula or hollow needle; and a polymeric coating that covers a substantial portion of the surface area of said hermetically-sealed housing, wherein said polymeric coating further contacts and covers a portion of the exposed electrodes.