Medicare Part D Payments for Indian Health Service (IHS) & Tribal Facilities By Debra A. McCurdy on 27 October 2008 Print:Email this postLike this postShare this post on LinkedIn On November 5, 2008, CMS will host a Special Open Door Forum on “Medicare Part D Payments to Indian Health Service (IHS) & Tribal Facilities,” including an overview of Medicare Part D changes for 2009.