The Top 10 Biggest Health Insurance Companies in the U.S.

Health insurance companies in the United States come in all shapes and sizes, offering health care plans to many Americans. How do you know which one is right for you? You can find out by reading this guide to the top 10 biggest health insurance companies in the U.S., along with information on costs, coverage, and customer service ratings of each one, so that you can find the best health insurance plan suited to your needs and budget.



1) Aetna

The U.S.-based health care company Aetna is one of the biggest health insurance companies in America with approximately 38 million customers. Aetna offers products under four main categories: group and individual insurance, Medicare, employer-related and voluntary products. In 2018, UnitedHealth Group announced it had acquired a majority stake (54 percent) of Aetna for $6.8 billion.


2) UnitedHealth Group

UnitedHealth Group is one of America’s largest health insurance companies and was named #1 on FORTUNE Magazine’s list of 100 Best Companies to Work For, most recently in 2018. According to FORTUNE, UnitedHealth has roughly 225,000 employees working throughout all 50 states and more than 90 countries worldwide.


3) Anthem

Based in Indianapolis, Ind., Anthem has nearly 38 million customers and is one of the nation's largest health insurance companies. It offers plans on public exchanges under Blue Cross and Blue Shield brands across 14 states, serving as an Affordable Care Act insurer for more than 880,000 people nationwide. Aetna: The Hartford-based insurer provides care to about 22 million members through its own company or through Medicare Advantage or Medicaid plans that use its networks of physicians and hospitals.


4) Blue Cross Blue Shield Association

Blue Cross Blue Shield Association (BCBS) is a federation of 36 separate health insurance organizations, each of which operates independently. In total, BCBS has more than 100 million customers and an annual revenue exceeding $100 billion, according to National Public Radio (NPR). As a part of its mission to provide health care services to all people at all times, BCBS works with Medicare and Medicaid programs, as well as state and federal healthcare initiatives to expand access to health care coverage for all American citizens, according to its website.


5) Cigna Corporation

The Cigna Corporation is an American corporation that offers health insurance services and other insurance products and administers employee benefit plans, as well as provides investment management services to institutions and individuals. As of September 30, 2016, Cigna had over 35 million medical members in more than 30 countries.


6) Humana Inc.

Humana, Inc., headquartered in Louisville, KY, is a health insurance company with $55 billion in annual revenues and over 13 million customers nationwide. The company offers health insurance coverage for individuals and families as well as specialty care services, such as behavioral health care and long-term care treatment plans. The company also has numerous product offerings for employers who sponsor employee benefits plans.


7) Kaiser Foundation Group, Inc.

One of America’s biggest health insurance companies, Kaiser Permanente offers a variety of plans for businesses and individuals. The company has grown from its original roots as an HMO (Health Maintenance Organization) to now offer numerous health insurance plans including PPO’s (Preferred Provider Organizations) and Medicare Advantage Plans for seniors.


8) WellPoint, Incorporated

In 2012, WellPoint was acquired by Anthem for $54 billion and was officially renamed Anthem, Incorporated. The move created a new health insurance behemoth and shifted WellPoint from third to fourth place on our list of biggest health insurance companies in America. This also means that it’s now slightly larger than UnitedHealthcare Group, which fell back one rank as a result of its merger with Aetna.


9) Health Care Service Corporation (HCSC).

Despite having a more nondescript name than most health insurers, HCSC is one of America’s largest insurance providers, offering coverage to over 12 million people across a variety of plans. Headquartered in Chicago, Illinois, HCSC provides health and dental insurance to individuals and businesses through employer groups and privately-purchased plans. Its subsidiaries—Blue Cross Blue Shield affiliates—serve an additional 17 million members annually through their own network of independent agents and brokers nationwide.


10) Centene Corporation

Health insurance company Centene Corporation is one of the largest healthcare companies in America, providing medical coverage to more than 3 million people. Headquartered in St. Louis, Missouri, Centene specializes in health insurance plans for individuals and families, small groups and large groups, Medicaid coverage for qualified low-income patients and government-sponsored health exchanges under Affordable Care Act (ACA), Medicare Advantage plans for seniors, Medigap supplemental insurance policies for seniors as well as care management services.

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