Active medical implant market demand is in rise due to the increased use of such devices for broader therapeutic applications. One major concern of the use of active medical device is the possible electromagnetic interference effect that the implant pulse generator can be subjected to. In this regard, this chapter investigates the shielding effectiveness of conventional implant materials. The variations in the shielding characteristics due to material modification through alloying is comprehended and the caliber of material modification is recognized. Metamaterials have been identified as a plausible material modification for many applications as they exhibit capacity in manipulating and controlling electromagnetic fields approaching the material. On this point, a review on the different applications of metamaterials, metasurfaces, and the merit factors are discussed. Under the state-of-the-art scenario that metamaterials serve compatible applications in medical field like replacement materials for orthopedic or dental implant, energy harvesting materials for biosensor and wearable devices, and absorbers and cloaks for imaging applications, the potential use of metallic metamaterials for implant is reviewed. The plausible superiority of metasurfaces offers promising scope in active medical implants thereby setting the stage for further research.