Editor's note: This story was updated on May 25, 2018.

Fortune on Monday released its 64th annual ranked list of the 500 companies that generated the most revenue in the previous fiscal year, and seven health care systems—as well as dozens of other companies in the health care industry—earned a spot.

About the list

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Fortune compiles the list based on the total revenues of for-profit companies for their 2017 fiscal years. To be eligible for the list, companies must file financial documents with a state or federal agency.

This year's Fortune 500 companies are responsible for about two-thirds of the U.S. gross domestic product. The companies have a total of $12.8 trillion in revenues, $1 trillion in profits, and $21.6 trillion in market value, and they employ about 28.2 million people worldwide, according to Fortune.

Many health systems are organized as not-for-profits, which are not eligible for inclusion on the Fortune 500.

Health care companies that made the list

The seven health care providers on this year's top 500 list are:

63. HCA Healthcare (Nashville, Tennessee);

147. Tenet Healthcare (Dallas);

160. Community Health Systems (Franklin, Tennessee);

179. DaVita (Denver);

268. Universal Health Services (King of Prussia, Pennsylvania);

390. LifePoint Health (Brentwood, Tennessee); and

416. Kindred Healthcare (Louisville, Kentucky).

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The top 500 list also features nine health insurance companies:

5. UnitedHealth Group (Minnetonka, Minnesota);

29. Anthem (Indianapolis);

49. Aetna (Hartford, Connecticut);

56. Humana (Louisville, Kentucky);

61. Centene (St. Louis, Missouri);

73. Cigna (Bloomfield, Connecticut);

152. Molina Healthcare (Long Beach, California);

170. WellCare Health Plans (Tampa, Florida); and

475. Magellan Health (Scottsdale, Arizona).

(The Daily Briefing is published by Advisory Board, a division of Optum, which is owned by UnitedHealth Group. UnitedHealth Group separately owns UnitedHealthcare.)

Eleven pharmaceutical companies also made the top 500 list:

37. Johnson & Johnson (New Brunswick; New Jersey);

57. Pfizer (New York City);

78. Merck (Kenilworth, New Jersey);

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110. AbbVie (North Chicago);

116. Gilead Sciences (Foster City, California);

129. Eli Lilly (Indianapolis)

130. Amgen (Thousand Oaks, California);

145. Bristol-Myers Squibb (New York City);

224. Celgene (Summit, New Jersey);

245. Biogen (Cambridge, Massachusetts); and

473. Regeneron Pharmaceuticals (Tarrytown, New York).

Walmart, which has been expanding into the health care field, once again topped the overall Fortune 500 list. In March, the Wall Street Journal reported that Walmart was in early talks to buy insurer Humana.

Other health care-related companies in the top 500 spots on the list include:

7. CVS Health (Woonsocket, Rhode Island);

14. Cardinal Health (Dublin, Ohio);

25. Express Scripts Holding (St. Louis, Missouri);

111. Abbott Laboratories (Abbott Park, Illinois);

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162. Danaher (Washington, D.C.);

198. Envision Healthcare (Nashville, Tennessee);

240. Stryker (Kalamazoo, Michigan);

251. Becton Dickinson (Franklin Lakes, New Jersey);

283. Baxter International (Deerfield, Illinois);

286. Laboratory Corp. of America (Burlington, North Carolina);

304. IQVIA Holdings (Durham, North Carolina);

328. Boston Scientific (Marlborough, Massachusetts);

361. Zimmer Biomet Holdings (Warsaw, Indiana); and

367. Quest Diagnostics (Secaucus, New Jersey) (Vartorella, Becker's Hospital Review, 5/21; Forbes Fortune 500 list; accessed 5/22).

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