There is a big difference between UnitedHealthcare and UnitedHealth Group. UnitedHealthcare is the insurance arm of UnitedHealth Group. UnitedHealth Group is a for-profit company that also owns a number of other businesses, including a pharmacy benefits manager and an information technology company. UnitedHealthcare is the largest health insurer in the United States, and it provides health insurance plans to individuals, families, and businesses. UnitedHealth Group, on the other hand, is a much larger company that provides a wide range of health-related products and services, including insurance, pharmacy benefits management, and information technology.