Anti-man - Dean Kootz

Sam was an android.
His flesh was the ultimate miracle of science, artificially created and completely self-sustaining. And he had the unusual power to heal others. In fact, Sam was too good to live.
The world was overpopulated. Medicine had made the decision to stop trying to prolong life. Thus anyone who was not only immune to disease but who healed the dying was dangerous to the now precarious balance of nature.