text: Health insurer grows as industry changes UnitedHealth Group, the largest US health insurance company, has said that it will spend \$300 million in cash to buy Definity Health, a smaller health technology company specializing in plans that allow consumers leeway in directing their medical spending 
inputs: Health insurer grows as industry changes UnitedHealth Group, the largest US health insurance company, has said that it will spend \$300 million in cash to buy Definity Health, a smaller health technology company specializing in plans that allow consumers leeway in directing their medical spending 