Top 100 Contractors in NAICS 621: Ambulatory Health Care Services, FY2023

Name: Top 100 Contractors in NAICS 621: Ambulatory Health Care Services, FY2023
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2022 – Sep 30, 2023 Code page on GovTribe

The top 10 won 51% of FY2023 NAICS 621 contract dollars

Contract obligations: $6,542,603,787 Net of deobligations, by contracts coded NAICS 621 or a code under it
Contractors: 2,509 Parent companies with an obligation
Largest contractor: Leidos Holdings, Inc. $1.23 billion, 15.8% of obligations
Data as of: Oct 14, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Leidos Holdings, Inc. Through QTC Medical Services Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) DHS (Department of Homeland Security)	$1,228,707,589	15.8%	Rank history: #3 in FY2021, #2 in FY2022, #1 in FY2024 and #1 in FY2025; up 1 since FY2022.
2	UnitedHealth Group Incorporated Through Optumserve Health Services, Inc. Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) HHS (Department of Health and Human Services)	$746,005,576	9.6%	Rank history: #4 in FY2021, #3 in FY2022, #2 in FY2024 and #2 in FY2025; up 1 since FY2022.
3	Maximus Inc. Through Veterans Evaluation Services, Inc. Top agencies VA (Department of Veterans Affairs)	$692,925,364	8.9%	Rank history: #11 in FY2021, #4 in FY2022, #4 in FY2024 and not on the FY2025 list; up 1 since FY2022.
4	Fresenius Medical Care AG & Co. Kgaa Through Fresenius Medical Care Holdings Inc. Top agencies VA (Department of Veterans Affairs)	$350,470,816	4.5%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
5	Davita Inc. 6 awardees, including Renal Treatment Centers-West, Inc., Total Renal Care, Inc. and Renal Treatment Centers-California, Inc. Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force)	$252,529,947	3.2%	Rank history: #9 in FY2021, #7 in FY2022, not on the FY2024 list and #6 in FY2025; up 2 since FY2022.
6	STG International, Inc. Top agencies DHS (Department of Homeland Security) VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$184,407,669	2.4%	Rank history: #14 in FY2021, #9 in FY2022, #6 in FY2024 and #11 in FY2025; up 3 since FY2022.
7	Quest Diagnostics Incorporated 11 awardees, including Ameripath Inc., Quest Diagnostics Clinical Laboratories, Inc. and Athena Diagnostics, Inc. Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) DOJ (Department of Justice)	$140,332,677	1.8%	Rank history: #13 in FY2021, #8 in FY2022, #10 in FY2024 and #12 in FY2025; up 1 since FY2022.
8	Laboratory Corporation of America 4 awardees, including Labcorp Oklahoma Inc. and Monogram Biosciences, Inc. Top agencies DHA (Defense Health Agency) VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$137,168,370	1.8%	Rank history: #46 in FY2021, #31 in FY2022, #9 in FY2024 and #8 in FY2025; up 23 since FY2022.
9	CVS Health Corporation 3 awardees, including CVS Pharmacy, Inc. and Minuteclinic, L.L.C. Top agencies HHS (Department of Health and Human Services) EOP (Executive Office of the President)	$123,819,396	1.6%	Rank history: #18 in FY2021, #5 in FY2022, #30 in FY2024 and not on the FY2025 list; down 4 since FY2022.
10	Tcfii Valor Buyer LLC Through Valor Healthcare Inc. Top agencies VA (Department of Veterans Affairs)	$114,553,752	1.5%	Rank history: #21 in FY2021, #21 in FY2022, #8 in FY2024 and not on the FY2025 list; up 11 since FY2022.
11	Kbr, Inc. 2 awardees, including KBR Wyle Services, LLC Top agencies USSOCOM (United States Special Operations Command) USAF (Department of the Air Force)	$111,597,353	1.4%	Rank history: #16 in FY2021, #16 in FY2022, #28 in FY2024 and not on the FY2025 list; up 5 since FY2022.
12	Loyal Source Government Services LLC Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force) DHS (Department of Homeland Security)	$102,994,864	1.3%	Rank history: #53 in FY2021, #24 in FY2022, #5 in FY2024 and #4 in FY2025; up 12 since FY2022.
13	International Sos Government Medical Services, Inc. Top agencies Army (Department of the Army)	$65,695,828	0.8%	Rank history: not on the FY2021 list, #25 in FY2022, #16 in FY2024 and not on the FY2025 list; up 12 since FY2022.
14	Sterling Medical Corporation 2 awardees, including Sterling Medical Associates, Inc. Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force) DHA (Defense Health Agency)	$58,572,439	0.8%	Rank history: #17 in FY2021, #23 in FY2022, #13 in FY2024 and not on the FY2025 list; up 9 since FY2022.
15	Team Health Inc. 2 awardees, including Spectrum Healthcare Resources, Inc. and Spectrum Federal Solutions LLC Top agencies DHA (Defense Health Agency) Navy (Department of the Navy) VA (Department of Veterans Affairs)	$56,047,441	0.7%	Rank history: #19 in FY2021, #17 in FY2022, #45 in FY2024 and not on the FY2025 list; up 2 since FY2022.
16	Ami Expeditionary Healthcare (USA) LLC Top agencies DHS (Department of Homeland Security)	$55,237,016	0.7%	Rank history: not on the FY2021 list, #19 in FY2022 and not on the FY2024–FY2025 lists; up 3 since FY2022.
17	Helix Opco LLC Top agencies HHS (Department of Health and Human Services)	$45,475,768	0.6%	Rank history: #51 in FY2021, #18 in FY2022 and not on the FY2024–FY2025 lists; up 1 since FY2022.
18	Pact, Inc. Top agencies USAID (US Agency for International Development)	$43,882,030	0.6%	Rank history: not on the FY2021–FY2022 lists, #18 in FY2024 and #84 in FY2025; new.
19	The Chenega Corporation 4 awardees, including Chenega Tri-Services, LLC, Chenega Healthcare Services LLC and Chenega Reliable Services LLC Top agencies Army (Department of the Army) DOE (Department of Energy) Commerce (Department of Commerce)	$38,908,977	0.5%	Rank history: #26 in FY2021, #28 in FY2022, #32 in FY2024 and not on the FY2025 list; up 9 since FY2022.
20	Icahn School of Medicine at Mount Sinai 2 awardees, including Mount Sinai Hospital Top agencies HHS (Department of Health and Human Services)	$36,686,561	0.5%	Rank history: #30 in FY2021, #40 in FY2022, #14 in FY2024 and not on the FY2025 list; up 20 since FY2022.
21	Complete Mobile Dentistry, Inc. Top agencies DHA (Defense Health Agency) HHS (Department of Health and Human Services)	$35,497,152	0.5%	Rank history: #45 in FY2021, #22 in FY2022 and not on the FY2024–FY2025 lists; up 1 since FY2022.
22	Valor Healthcare Inc. 2 awardees, including Crassociates, Inc. Top agencies VA (Department of Veterans Affairs)	$35,149,373	0.5%	Rank history: #33 in FY2021, #13 in FY2022, #44 in FY2024 and #7 in FY2025; down 9 since FY2022.
23	Triwest Healthcare Alliance Corp Top agencies VA (Department of Veterans Affairs)	$33,584,105	0.4%	Rank history: #1 in FY2021, #15 in FY2022 and not on the FY2024–FY2025 lists; down 8 since FY2022.
24	Dialysis Clinic, Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice)	$32,513,159	0.4%	Rank history: #27 in FY2021, #30 in FY2022 and not on the FY2024–FY2025 lists; up 6 since FY2022.
25	Primary Care Solutions Inc. Top agencies VA (Department of Veterans Affairs)	$32,166,738	0.4%	Rank history: #41 in FY2021, #29 in FY2022, #26 in FY2024 and #25 in FY2025; up 4 since FY2022.
26	Laboratory Corporation of America Holdings 7 awardees, including Center for Disease Detection, LLC and Laboratory Corporation of America Top agencies HHS (Department of Health and Human Services) Navy (Department of the Navy) Army (Department of the Army)	$31,129,195	0.4%	Rank history: #12 in FY2021, #10 in FY2022 and not on the FY2024–FY2025 lists; down 16 since FY2022.
27	Anthony & Associates Inc. Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$28,119,378	0.4%	Rank history: not on the FY2021–FY2022 lists, #90 in FY2024 and not on the FY2025 list; up 376 since FY2022.
28	New York City Health and Hospitals Corporation 2 awardees, including New York Health and Hospitals Corporation Top agencies HHS (Department of Health and Human Services)	$27,916,609	0.4%	Rank history: #50 in FY2021, #56 in FY2022, #19 in FY2024 and #22 in FY2025; up 28 since FY2022.
29	The American National Red Cross 2 awardees Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services) DHA (Defense Health Agency)	$27,500,958	0.4%	Rank history: #35 in FY2021, #32 in FY2022, #27 in FY2024 and #39 in FY2025; up 3 since FY2022.
30	US Renal Care Inc. 2 awardees, including Dialysis Newco, LLC Top agencies VA (Department of Veterans Affairs)	$25,985,393	0.3%	Rank history: #37 in FY2021, #35 in FY2022, not on the FY2024 list and #14 in FY2025; up 5 since FY2022.
31	Giacare & Medtrust JV LLC Top agencies Army (Department of the Army)	$24,993,960	0.3%	Rank history: #43 in FY2021, #20 in FY2022, #22 in FY2024 and #27 in FY2025; down 11 since FY2022.
32	Servefed Inc. Top agencies HHS (Department of Health and Human Services) NASA (National Aeronautics and Space Administration) USAF (Department of the Air Force)	$23,828,446	0.3%	Rank history: #89 in FY2021, #34 in FY2022, #23 in FY2024 and #26 in FY2025; up 2 since FY2022.
33	American Renal Associates LLC 2 awardees, including University Kidney Center, LLC Top agencies VA (Department of Veterans Affairs)	$23,217,674	0.3%	Rank history: not on the FY2021 list, #38 in FY2022 and not on the FY2024–FY2025 lists; up 5 since FY2022.
34	Roche Diabetes Care Inc Through Foundation Medicine, Inc. Top agencies VA (Department of Veterans Affairs)	$19,078,100	0.2%	Rank history: not on the FY2021–FY2022 lists, #25 in FY2024 and not on the FY2025 list; new.
35	CHS Middle East LLC Through Acuity-Chs, LLC Top agencies DHS (Department of Homeland Security) DOI (Department of the Interior) WHS (DOD Washington Headquarters Service)	$18,813,002	0.2%	Rank history: #29 in FY2021, #41 in FY2022 and not on the FY2024–FY2025 lists; up 6 since FY2022.
36	Ansible Government Solutions LLC Top agencies VA (Department of Veterans Affairs)	$18,803,121	0.2%	Rank history: not on the FY2021–FY2022 lists, #46 in FY2024 and not on the FY2025 list; up 72 since FY2022.
37	Excelsior Ambulance Service Inc. Top agencies VA (Department of Veterans Affairs)	$18,442,451	0.2%	Rank history: #99 in FY2021, #50 in FY2022, #35 in FY2024 and #33 in FY2025; up 13 since FY2022.
38	Avosys Technology, Inc. Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$17,858,334	0.2%	Rank history: #55 in FY2021, #62 in FY2022, #72 in FY2024 and #64 in FY2025; up 24 since FY2022.
39	Do Know Harm LLC Top agencies DOS (Department of State)	$17,270,540	0.2%	Rank history: not on the FY2021 list, #36 in FY2022 and not on the FY2024–FY2025 lists; down 3 since FY2022.
40	The Research Foundation for the State University of New York Top agencies HHS (Department of Health and Human Services)	$16,190,124	0.2%	Rank history: #56 in FY2021, #78 in FY2022 and not on the FY2024–FY2025 lists; up 38 since FY2022.
41	Reliance Medical Transport, LLC Top agencies VA (Department of Veterans Affairs)	$15,984,112	0.2%	Rank history: not on the FY2021 list, #83 in FY2022, #52 in FY2024 and #44 in FY2025; up 42 since FY2022.
42	STS Solutions and Training, LLC Top agencies DHA (Defense Health Agency)	$15,805,601	0.2%	Rank history: #42 in FY2021, #53 in FY2022, #82 in FY2024 and not on the FY2025 list; up 11 since FY2022.
43	SNA International LLC Top agencies WHS (DOD Washington Headquarters Service)	$15,305,513	0.2%	Rank history: not on the FY2021 list, #55 in FY2022, #36 in FY2024 and #41 in FY2025; up 12 since FY2022.
44	Dilligas Corp Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force) HHS (Department of Health and Human Services)	$15,187,744	0.2%	Rank history: not on the FY2021–FY2022 lists, #80 in FY2024 and #48 in FY2025; up 407 since FY2022.
45	Tribal TECH LLC Top agencies DOI (Department of the Interior)	$15,152,603	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 320 since FY2022.
46	Destiny Management Services, LLC Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$15,127,531	0.2%	Rank history: #93 in FY2021, #96 in FY2022, #41 in FY2024 and #58 in FY2025; up 50 since FY2022.
47	Valor Network, Inc. Top agencies DHA (Defense Health Agency) DHS (Department of Homeland Security) USAF (Department of the Air Force)	$14,632,863	0.2%	Rank history: #74 in FY2021, #52 in FY2022, #38 in FY2024 and #37 in FY2025; up 5 since FY2022.
48	Cognito Systems LLC Top agencies Army (Department of the Army)	$14,390,271	0.2%	Rank history: #72 in FY2021, #58 in FY2022, #37 in FY2024 and #35 in FY2025; up 10 since FY2022.
49	Dawson Cms, LLC Top agencies DHA (Defense Health Agency) Army (Department of the Army)	$13,570,065	0.2%	Rank history: not on the FY2021 list, #68 in FY2022, #29 in FY2024 and #19 in FY2025; up 19 since FY2022.
50	MCI Diagnostic Center LLC Top agencies DOL (Department of Labor) Army (Department of the Army) VA (Department of Veterans Affairs)	$13,538,969	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
51	New York City of Through City of New York Fire Department Top agencies HHS (Department of Health and Human Services)	$13,485,529	0.2%	Rank history: #63 in FY2021, #75 in FY2022 and not on the FY2024–FY2025 lists; up 24 since FY2022.
52	Delta Dental Plan of Oklahoma Top agencies HHS (Department of Health and Human Services)	$13,216,815	0.2%	Rank history: not on the FY2021–FY2022 lists, #69 in FY2024 and not on the FY2025 list; up 83 since FY2022.
53	Vesa Health & Technology Inc. Top agencies DHS (Department of Homeland Security)	$12,594,251	0.2%	Rank history: #36 in FY2021, #46 in FY2022, #74 in FY2024 and not on the FY2025 list; down 7 since FY2022.
54	Oregon Health & Science University Top agencies VA (Department of Veterans Affairs)	$12,042,649	0.2%	Rank history: #76 in FY2021, not on the FY2022 list, #76 in FY2024 and not on the FY2025 list; up 77 since FY2022.
55	Rotech Healthcare Inc. Top agencies VA (Department of Veterans Affairs)	$11,895,024	0.2%	Rank history: #49 in FY2021, not on the FY2022 list, #71 in FY2024 and #100 in FY2025; up 55 since FY2022.
56	Health Partner's Management Group, Incorporated Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$11,680,012	0.1%	Rank history: not on the FY2021 list, #88 in FY2022, #51 in FY2024 and #49 in FY2025; up 32 since FY2022.
57	United Medevac Solutions, Inc. Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force) Army (Department of the Army)	$11,575,512	0.1%	Rank history: #62 in FY2021, #61 in FY2022, #66 in FY2024 and #98 in FY2025; up 4 since FY2022.
58	Prairie Quest, Inc. Top agencies DHA (Defense Health Agency)	$11,450,494	0.1%	Rank history: #71 in FY2021, #72 in FY2022, #50 in FY2024 and #54 in FY2025; up 14 since FY2022.
59	The Henry M. Jackson Foundation for the Advancement of Military Medicine, Inc. Top agencies DHA (Defense Health Agency)	$11,068,141	0.1%	Rank history: not on the FY2021 list, #77 in FY2022, not on the FY2024 list and #55 in FY2025; up 18 since FY2022.
60	Mid-Cities Home Medical Delivery Service, L.L.C. Top agencies VA (Department of Veterans Affairs)	$10,623,956	0.1%	Rank history: #81 in FY2021, #81 in FY2022, #49 in FY2024 and not on the FY2025 list; up 21 since FY2022.
61	University of Texas System 4 awardees, including The Univeristy of Texas M.d. Anderson Cancer Center, The University of Texas Southwestern Medical Center and University of Texas Health Science Center At Houston Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$10,402,345	0.1%	Rank history: not on the FY2021 list, #63 in FY2022 and not on the FY2024–FY2025 lists; up 2 since FY2022.
62	University of Utah 2 awardees, including Arup Laboratories Inc. Top agencies VA (Department of Veterans Affairs)	$10,386,264	0.1%	Rank history: #82 in FY2021, #76 in FY2022 and not on the FY2024–FY2025 lists; up 14 since FY2022.
63	Medicus Healthcare Solutions, LLC Top agencies VA (Department of Veterans Affairs) HHS (Department of Health and Human Services)	$9,628,856	0.1%	Rank history: not on the FY2021–FY2022 lists, #86 in FY2024 and #88 in FY2025; up 40 since FY2022.
64	Four Winds Staffing LLC Top agencies HHS (Department of Health and Human Services)	$9,267,208	0.1%	Rank history: not on the FY2021–FY2022 lists, #55 in FY2024 and #66 in FY2025; up 49 since FY2022.
65	Mayo Clinic 3 awardees, including Mayo Collaborative Services, Inc., Mayo Clinic Ambulance and Mayo Clinic Arizona Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$9,159,022	0.1%	Rank history: #64 in FY2021, #82 in FY2022 and not on the FY2024–FY2025 lists; up 17 since FY2022.
66	Sequoyah Staffing Agency, LLC Top agencies HHS (Department of Health and Human Services)	$9,020,919	0.1%	Rank history: not on the FY2021–FY2022 lists, #59 in FY2024 and not on the FY2025 list; up 133 since FY2022.
67	CS Holding Inc. Through CG Services LLC Top agencies DHA (Defense Health Agency)	$8,998,009	0.1%	Rank history: #94 in FY2021, not on the FY2022 list, #58 in FY2024 and not on the FY2025 list; up 49 since FY2022.
68	Home Care Equipment, Inc. Top agencies VA (Department of Veterans Affairs)	$8,974,344	0.1%	Rank history: #79 in FY2021, #45 in FY2022 and not on the FY2024–FY2025 lists; down 23 since FY2022.
69	Medshore Ambulance Service Inc. Top agencies VA (Department of Veterans Affairs)	$8,749,333	0.1%	Rank history: #73 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; returned.
70	Gerald L Ignace Indian Health Center Inc. Top agencies HHS (Department of Health and Human Services)	$8,492,698	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 56 since FY2022.
71	Abbott Laboratories 4 awardees, including Pembrooke Occupational Health, Inc., Alere Toxicology Services, Inc. and Abbott Rapid Diagnostics Informatics, Inc. Top agencies OSD (Office of the Secretary of Defense) DOI (Department of the Interior) DOT (Department of Transportation)	$8,476,111	0.1%	Rank history: not on the FY2021 list, #86 in FY2022 and not on the FY2024–FY2025 lists; up 15 since FY2022.
72	Reef Systems Corp Top agencies USAF (Department of the Air Force)	$8,359,362	0.1%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #79 in FY2025; new.
73	Maat Enterprises Inc. Top agencies HHS (Department of Health and Human Services)	$8,280,685	0.1%	Rank history: not on the FY2021–FY2022 lists, #73 in FY2024 and not on the FY2025 list; up 117 since FY2022.
74	Western-Star Hospital Authority Inc. Top agencies VA (Department of Veterans Affairs) Army (Department of the Army)	$8,221,871	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 97 since FY2022.
75	Acadian Ambulance Service Inc. 3 awardees, including Acadian Ambulance Service of Texas, LLC and Acadian Ambulance Service of Tennessee, LLC Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice)	$8,199,312	0.1%	Rank history: #59 in FY2021, #59 in FY2022, #68 in FY2024 and not on the FY2025 list; down 16 since FY2022.
76	Wisestaff, LLC Top agencies Army (Department of the Army)	$8,154,306	0.1%	Rank history: #61 in FY2021, #42 in FY2022, #54 in FY2024 and #53 in FY2025; down 34 since FY2022.
77	Medex Medical Transport Service Inc. Top agencies DHA (Defense Health Agency) VA (Department of Veterans Affairs)	$8,002,902	0.1%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #62 in FY2025; up 50 since FY2022.
78	Koniag, Inc. 2 awardees, including Kadiak LLC Top agencies DHS (Department of Homeland Security)	$7,984,203	0.1%	Rank history: not on the FY2021 list, #67 in FY2022, not on the FY2024 list and #77 in FY2025; down 11 since FY2022.
79	Ghost RX Inc. Top agencies VA (Department of Veterans Affairs)	$7,688,690	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
80	T3I, Inc. Top agencies USAF (Department of the Air Force)	$7,684,548	0.1%	Rank history: #96 in FY2021, not on the FY2022 list, #70 in FY2024 and #69 in FY2025; up 40 since FY2022.
81	LMR Technical Group LLC Top agencies USAF (Department of the Air Force)	$7,276,165	0.1%	Rank history: #91 in FY2021, #70 in FY2022, #77 in FY2024 and #36 in FY2025; down 11 since FY2022.
82	Bay Area Anesthesia LLC Top agencies HHS (Department of Health and Human Services)	$7,099,873	0.1%	Rank history: not on the FY2021–FY2022 lists, #48 in FY2024 and #86 in FY2025; up 131 since FY2022.
83	Gift of Hope Organ & Tissue Donor Network Top agencies VA (Department of Veterans Affairs)	$7,091,530	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 171 since FY2022.
84	Jan-Care Ambulance of North Central W.va., Inc. Top agencies VA (Department of Veterans Affairs)	$6,916,657	0.1%	Rank history: not on the FY2021 list, #80 in FY2022, #81 in FY2024 and #61 in FY2025; down 4 since FY2022.
85	Medforce Government Solutions, Inc. Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$6,810,008	0.1%	Rank history: not on the FY2021 list, #69 in FY2022 and not on the FY2024–FY2025 lists; down 16 since FY2022.
86	Central Oklahoma American Indian Health Council, Inc. Top agencies HHS (Department of Health and Human Services)	$6,744,735	0.1%	Rank history: #83 in FY2021, #39 in FY2022 and not on the FY2024–FY2025 lists; down 47 since FY2022.
87	Prairie Band Health Services Inc. Top agencies HHS (Department of Health and Human Services)	$6,736,210	0.1%	Rank history: not on the FY2021 list, #87 in FY2022, #42 in FY2024 and #38 in FY2025; unchanged since FY2022.
88	Jade Wolf Operations, LLC Top agencies VA (Department of Veterans Affairs)	$6,656,841	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 228 since FY2022.
89	Duke University Top agencies HHS (Department of Health and Human Services)	$6,602,326	0.1%	Rank history: not on the FY2021 list, #73 in FY2022 and not on the FY2024–FY2025 lists; down 16 since FY2022.
90	Eagle Health, LLC Top agencies HHS (Department of Health and Human Services) DHA (Defense Health Agency) NRC (Nuclear Regulatory Commission)	$6,330,656	0.1%	Rank history: not on the FY2021 list, #74 in FY2022 and not on the FY2024–FY2025 lists; down 16 since FY2022.
91	Indian Health Care Resource Center of Tulsa, Inc. Top agencies HHS (Department of Health and Human Services)	$6,245,899	0.1%	Rank history: #48 in FY2021, #66 in FY2022 and not on the FY2024–FY2025 lists; down 25 since FY2022.
92	Texas Native Health Top agencies HHS (Department of Health and Human Services)	$6,137,687	0.1%	Rank history: #47 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 31 since FY2022.
93	Empowered Management Solutions LLC Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$6,056,605	0.1%	Rank history: #80 in FY2021, #71 in FY2022, #94 in FY2024 and not on the FY2025 list; down 22 since FY2022.
94	Quacito LLC Top agencies Army (Department of the Army)	$5,964,613	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
95	Intertrade International Services SA Top agencies Army (Department of the Army)	$5,903,542	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
96	Stratus Federal Solutions LLC Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$5,726,615	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 341 since FY2022.
97	Caban Resources LLC Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$5,693,689	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 75 since FY2022.
98	Nativearc, LLC Top agencies HHS (Department of Health and Human Services)	$5,620,955	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 50 since FY2022.
99	Seattle Indian Health Board Top agencies HHS (Department of Health and Human Services)	$5,545,443	0.1%	Rank history: not on the FY2021–FY2022 lists, #97 in FY2024 and not on the FY2025 list; up 23 since FY2022.
100	AB Staffing Solutions LLC Top agencies HHS (Department of Health and Human Services) DOI (Department of the Interior)	$5,513,229	0.1%	Rank history: #77 in FY2021, #48 in FY2022 and not on the FY2024–FY2025 lists; down 52 since FY2022.

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100 of 2,509 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 621

Code	Net obligations	Largest contractor
6211 Offices of Physicians	$3,191,355,744	Leidos Holdings, Inc.
6214 Outpatient Care Centers	$1,330,317,936	Fresenius Medical Care AG & Co. Kgaa
6219 Other Ambulatory Health Care Services	$1,030,443,301	STG International, Inc.
6215 Medical and Diagnostic Laboratories	$496,461,978	Quest Diagnostics Incorporated
6213 Offices of Other Health Practitioners	$375,259,238	Kbr, Inc.
6212 Offices of Dentists	$63,773,538	Complete Mobile Dentistry, Inc.
6216 Home Health Care Services	$54,992,051	Rotech Healthcare Inc.

How this ranking works

Source: every contract action FPDS records (as published on SAM.gov) in the period, as GovTribe received it.
Amounts are net obligations: what was obligated, less what was deobligated. Shares are of $7.8 billion obligated before deobligations, so they never pass 100%.
Parent companies: each action counts under the ultimate parent its award record names, or under the awardee when it names none, so no dollar counts twice. Parents of the same name (Inc., LLC and the like aside) count as one company, since FPDS records a company's parent under more than one UEI over time. GovTribe corrects a few parents and names by hand; see the corrections.
Fiscal year 2023 ran Oct 1, 2022 – Sep 30, 2023. The Department of Defense reports its contract actions to FPDS about 90 days late, so a fiscal year is ranked once they're in, in February, and the list doesn't change after.
Rank changes compare with FY2022. "New" marks a company outside that period's top 500, and "Returned" one of those that was on an earlier fiscal year's list.
Rank lines show each company's rank on every fiscal year's list since FY2021, #1 at the top, on a scale that gives the top of the list more room. A dashed stretch spans years it wasn't on the list. The step from FY2022 takes the color of the rank change beside it.
Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

Quick answers

Who were the top 10 NAICS 621 contractors in FY2023?

1. Leidos Holdings, Inc. ($1.23B), 2. UnitedHealth Group Incorporated ($746M), 3. Maximus Inc. ($693M), 4. Fresenius Medical Care AG & Co. Kgaa ($350M), 5. Davita Inc. ($253M), 6. STG International, Inc. ($184M), 7. Quest Diagnostics Incorporated ($140M), 8. Laboratory Corporation of America ($137M), 9. CVS Health Corporation ($124M), 10. Tcfii Valor Buyer LLC ($115M).

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