Top Health Insurance Companies in USA 2024

The U.S. has more than 900 health insurance companies that provide medical coverage, but the industry is dominated by five companies that own 44 percent of the market.

Here are the top five largest health insurance companies by membership:

  • UnitedHealthcare: 70 million members
  • Anthem: 39.9 million members
  • Aetna: 22.1 million members
  • Cigna: 20.4 million members
  • Humana: 16.6 million members
  • Related: Outsource Provider Credentialing Services

United Healthcare:

United Healthcare part of UnitedHealth Group, is the largest health insurance company that provides a broad variety of health benefits, making it possible for people to get coverage at an affordable price, streamlining the medical process, and providing access to high-quality treatment. UnitedHealthcare Employer & Individual serves 26.7 million Americans by offering a comprehensive array of consumer-oriented health benefit plans and services nationwide for large national employers, public sector employers, mid-sized employers, small businesses, and individuals.

UnitedHealthcare Medicare & Retirement is dedicated to serving the health and well-being of 13.2 million older adults and other individuals eligible for Medicare. UnitedHealthcare Global delivers medical and dental benefits to 7.5 million people living, working, and traveling in more than 150 countries worldwide.

UnitedHealth Group employs approximately 168,000 individuals in 21 countries, including Australia, Canada, China, India, the Philippines, Ireland, Italy, and the United Kingdom. UnitedHealthcare covers approximately 45 million individuals worldwide. UnitedHealth Group’s services serve more than 6,100 healthcare facilities and 855,000 physicians and caregivers. UnitedHealthcare is headquartered in Minnetonka, Minn.


Anthem, Inc. is the second largest managed health care company within the Blue Cross Blue Shield Association of 36 different companies. In 2014, the company assumed the corporate name Anthem, Inc. Anthem serves 40 million health plan members and fourteen U.S. states served by Anthem include: California, Colorado, Connecticut, Georgia, Indiana, Kentucky, Maine, Missouri, Nevada, New Hampshire, New York, Ohio, Virginia, and Wisconsin.

The Blue Cross Blue Shield Association, which in total offers coverage in all 50 states, incorporates Anthem. Certain policyholders may profit from this relationship by getting countrywide access to medical care through the Blue Card program. Over 90% of physicians and hospitals are part of the largest provider network in the nation, Blue Cross Blue Shield.


Aetna was acquired by CVS Health Corp. in 2018, and currently offers affordable insurance plans for a range of coverage options, such as Medicaid, Medicare Advantage, Medicare Part D, individual health insurance, dental plans, and Medicare Advantage and Part D. The company’s network includes 22.1 million medical members, 12.7 million dental members, 13.1 million pharmacy benefit management services members, 1.2 million healthcare professionals, over 690,000 primary care doctors and specialists, and over 5,700 hospitals.
Aetna’s health insurance products include medical, pharmacy, dental, and behavioral health. They also offer services for health care management, workers’ compensation administration, and health information technology. Aetna, which was established in 1853, is the third-largest supplier of health insurance and services by the number of members it serves. A substantial portion of their membership comes from group health insurance policies that employers provide to their employees.

The United States’ fourth-largest significant medical insurance provider is Cigna, a global provider of health services and insurance with headquarters in Bloomfield, Connecticut. Cigna provides dental, behavioural health, vision, supplementary health, and Medicare/Medicaid services in addition to managing corporate health insurance policies and programmes.

Currently, 16 states—Arizona, Colorado, Florida, Georgia, Illinois, Indiana, Kansas, Mississippi, Missouri, North Carolina, Pennsylvania, South Carolina, Tennessee, Texas, Utah, and Virginia—offer individual health insurance through Cigna. Additionally, following recent growth, Cigna now provides Medicare Advantage plans in more than half of the nation.

Health care provider Humana, Inc. provides a variety of insurance products as well as health and wellness services that take an integrated approach to promoting lifelong healthy. The company was founded by David A. Jones, Sr. and Wendell Cherry as a nursing home company in 1961. Then known as Extendicare, the company became the largest nursing home company in the United States.

The following business segments make up how the company conducts its operations: Employer group, retail, and health and wellness services. The Medicare and commercial fully-insured medical and speciality health insurance benefits, such as dental, vision, and other add-on health and financial security products, are included in the retail segment and are marketed directly to individuals.

Enrollment in health insurance policy can be done in range of policies:

Medicare and retirement plans
Medicaid services
Individual health insurance
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