The nucleus of Amazon's effort to upend the health-care market may very well be the Echo device in your living room. According to an internal document obtained by CNBC, Amazon has built a team within its Alexa voice-assistant division called "health & wellness," which includes over a dozen people and is being led by Rachel Jiang, who has spent the last five years at Amazon in various roles including advertising and video. The team's main job is to make Amazon's Alexa voice assistant more useful in the health-care field, an effort that requires working through regulations and data privacy requirements laid out by HIPAA (the Health Insurance Portability and Accountability Act), according to people familiar with the matter. The group is targeting areas like diabetes management, care for mothers and infants and aging, said the people, who asked not to be named because the work is confidential. Echo/Alexa opens up a new sales channel for Amazon.