A while ago I read a short story where, thanks to some sort of nano-technology, all disease has been cured. Most people have to go to a hospital to have their blood monitored, but the main character has a ring that constantly monitors and filters his blood. As one of the few remaining surgeons, he goes to the only place where surgery is still required (which is I think Papua New Guinea, but it could be New Zealand, I'm not sure) where a virus is causing rampant tumor growth in the islanders. The next part is a spoiler I guess:
He meets a woman connected to some sort of underground movement who tells him that the data that allows the nano-technology to work was collected illegally on the people of the island who have the tumor disease. He says he will do whatever he can to help and they stage a mugging where they remove his ring Gollum style so they can use it to help the islanders and he can get a new one through his insurance.
I also remember that it opened with people sunbathing in Australia with tattoo's that change color in the sun because no one is afraid of skin cancer anymore.
Anyway, I've googled the heck out of everything I can remember and I can't find this thing, does this sound familiar to anyone?