Yours may not. But the 3 largest MA insurance plans cover upgrades (I assume the others do, too, but haven't checked). Ours just upgraded both a couple of months ago, no cost, no special rider, just a written application to have them upgraded plus letter from doctor explaining the benefits.
[Maybe you think I'm saying that the implant company provides free upgrades? I'm not, I'm referring to healthcare insurance covering the cost of processor upgrades, and then the company warranty begins anew.]
