The top health insurance company in the United States is UnitedHealthcare. UnitedHealthcare is a leading provider of health insurance and offers a wide range of plans to individuals, families, and employers. They have a large network of healthcare providers and offer comprehensive coverage options. UnitedHealthcare is known for their excellent customer service and innovative healthcare solutions. Other top health insurance companies in the US include Anthem, Aetna, Cigna, and Humana. It's important to compare different insurance providers and their plans to find the one that best suits your needs and budget. Additionally, factors such as coverage options, network of providers, customer satisfaction, and affordability should be considered when choosing a health insurance company. It's always a good idea to research and read reviews before making a decision. Remember, the best health insurance company for you may depend on your specific healthcare needs and preferences.