Devoted Health, a buzzy Medicare Advantage startup that raised $300 million in a massive funding round ahead of its first year offering health plans, has ambitious plans to grow its business over the next five years. Medicare Advantage is the private version of the US government health program for the elderly. Startups and established health insurers are rapidly expanding in the program. Business Insider has learned that Devoted Health, which launched its first plans in Florida this year, plans to make almost $1.2 billion in revenue by 2023 by growing to more than 100,000 members.