NAICS Subsector 621: Ambulatory Health Care Services
Subsector
Definition
Industries in the Ambulatory Health Care Services subsector provide health care services directly or indirectly to ambulatory patients and do not usually provide inpatient services. Health practitioners in this subsector provide outpatient services, with the facilities and equipment not usually being the most significant part of the production process.
Government contracts for this service: PSC Q403 Medical Evaluation and Screening Services
Code facts
- Part of
-
- 62
- Codes under it
- 7
- Contract awards
- 5,579 In the last 12 months
- Contract obligations
- $12,339,568,150 In FY2025
NAICS codes and definitions come from the U.S. Census Bureau and contract spending from SAM.gov/FPDS.
Contract obligations by fiscal year
| Fiscal year | Obligated |
|---|---|
| FY2027 To date | $579,646,043 |
| FY2026 | $11,231,425,094 |
| FY2025 | $12,339,568,150 |
| FY2024 | $7,873,720,951 |
| FY2023 | $6,542,603,787 |
Top contractors by obligations
| Rank | Contractor | Obligated, FY2026–FY2027 | Share |
|---|---|---|---|
| 1 | QTC Medical Services Inc. | $2,664,910,599 | |
| 2 | Optumserve Health Services, Inc. | $2,002,673,048 | |
| 3 | Loyal Source Government Services LLC | $1,840,555,617 | |
| 4 | Veterans Evaluation Services, Inc. | $1,788,406,223 | |
| 5 | Fresenius Medical Care Holdings Inc. | $268,719,798 | |
| 6 | Davita Inc. | $179,620,008 | |
| 7 | Valor Healthcare Inc. | $149,346,486 | |
| 8 | KBR Wyle Services, LLC | $119,787,311 | |
| 9 | Laboratory Corporation Of America | $106,003,313 | |
| 10 | Quest Diagnostics Incorporated | $98,454,014 |
See the full FY2025 ranking of NAICS 621 contractors, by parent company.
Top funding agencies by obligations
| Rank | Agency | Obligated, FY2026–FY2027 | Share |
|---|---|---|---|
| 1 | Department of Veterans Affairs | $9,843,898,122 | |
| 2 | Defense Health Agency | $688,712,358 | |
| 3 | Department of Health and Human Services | $361,541,116 | |
| 4 | Department of Homeland Security | $248,975,378 | |
| 5 | Department of the Army | $162,093,551 | |
| 6 | Air Force | $160,813,532 | |
| 7 | Department of Justice | $82,584,459 | |
| 8 | Department of Agriculture | $69,943,400 | |
| 9 | Social Security Administration | $56,546,164 | |
| 10 | Department of the Navy | $25,046,750 |
Top PSC codes by obligations
| Rank | PSC code | Obligated, FY2026–FY2027 | Share |
|---|---|---|---|
| 1 | Q403 Medical Evaluation and Screening Services | $8,201,421,709 | |
| 2 | Q999 Other Medical Services | $1,032,400,354 | |
| 3 | Q201 Medical – Managed Healthcare | $953,901,604 | |
| 4 | V225 Ambulance Service | $259,450,867 | |
| 5 | Q301 Reference Laboratory Testing | $239,416,618 | |
| 6 | Q522 Radiology Services | $176,053,530 | |
| 7 | Q401 Nursing | $133,699,429 | |
| 8 | Q802 Clerical Medical Support | $53,738,451 | |
| 9 | Q601 Medical Coding and Auditing | $51,577,724 | |
| 10 |
F003 Forest/ |
$48,334,863 |
Contract obligations by state
| Rank | Place of performance | Obligated, last 12 months | Share |
|---|---|---|---|
| 1 | Texas | $4,067,049,143 | |
| 2 | Florida | $2,071,111,686 | |
| 3 | Wisconsin | $1,845,347,584 | |
| 4 | Virginia | $339,575,685 | |
| 5 | Massachusetts | $308,250,383 | |
| 6 | Colorado | $242,124,218 | |
| 7 | Maryland | $219,985,539 | |
| 8 | New York | $160,124,970 | |
| 9 | Arizona | $104,003,110 | |
| 10 | New Mexico | $86,106,651 | |
| 11 | Pennsylvania | $78,935,623 | |
| 12 | Tennessee | $71,012,167 | |
| 13 | Georgia | $70,328,294 | |
| 14 | South Dakota | $63,809,546 | |
| 15 | Louisiana | $62,448,790 | |
| 16 | Illinois | $49,768,528 | |
| 17 | Oklahoma | $46,105,224 | |
| 18 | Oregon | $42,645,552 | |
| 19 | Washington | $41,966,943 | |
| 20 | Hawaii | $39,338,412 | |
| 21 | Mississippi | $36,496,833 | |
| 22 | District of Columbia | $31,417,801 | |
| 23 | Minnesota | $29,763,676 | |
| 24 | South Carolina | $24,358,650 | |
| 25 | California | $20,752,526 | |
| 26 | Nevada | $19,630,668 | |
| 27 | Utah | $18,197,057 | |
| 28 | Missouri | $17,104,590 | |
| 29 | Ohio | $16,949,951 | |
| 30 | Indiana | $16,686,327 | |
| 31 | North Carolina | $16,680,263 | |
| 32 | Alabama | $15,516,111 | |
| 33 | New Jersey | $15,169,871 | |
| 34 | Montana | $14,077,449 | |
| 35 | Arkansas | $13,988,757 | |
| 36 | Alaska | $12,616,673 | |
| 37 | West Virginia | $12,444,786 | |
| 38 | North Dakota | $12,233,158 | |
| 39 | Nebraska | $11,076,353 | |
| 40 | Michigan | $8,667,551 | |
| 41 | Kansas | $8,276,513 | |
| 42 | Idaho | $8,196,601 | |
| 43 | Kentucky | $6,959,276 | |
| 44 | Guam | $4,790,515 | |
| 45 | Connecticut | $4,409,609 | |
| 46 | Iowa | $4,134,814 | |
| 47 | Puerto Rico | $2,235,625 | |
| 48 | Wyoming | $1,746,835 | |
| 49 | New Hampshire | $1,681,313 | |
| 50 | Maine | $1,670,269 | |
| 51 | Vermont | $1,365,304 | |
| 52 | Rhode Island | $682,805 | |
| 53 | Delaware | $226,732 | |
| 54 | U.S. Virgin Islands | $60,130 |
Show all 54
Shares are of everything obligated under NAICS 621 in the last 12 months before deobligations, including work performed abroad or with no place of performance on record.
Contract opportunities
Show 37 more
Latest 47 of 36,301 listed here. See the rest on GovTribe.
Codes under 621
Quick answers
What is NAICS 621?
NAICS 621 is Ambulatory Health Care Services, a subsector in NAICS 62, Health Care and Social Assistance.
What codes are under NAICS 621?
NAICS 621 has 7 codes under it with their own GovTribe pages, including 6211 Offices of Physicians, 6212 Offices of Dentists and 6213 Offices of Other Health Practitioners.
How much do federal agencies spend under NAICS 621?
Federal contracts under NAICS 621 obligated $12,339,568,150 in fiscal year 2025 and $38,566,964,024 in fiscal years 2023 through 2027.
Who are the largest contractors under NAICS 621?
The contractors with the most obligated under NAICS 621 in fiscal years 2026 and 2027 are QTC Medical Services Inc. ($2,664,910,599); Optumserve Health Services, Inc. ($2,002,673,048); and Loyal Source Government Services LLC ($1,840,555,617).
Which agencies buy the most under NAICS 621?
The agencies that obligated the most under NAICS 621 in fiscal years 2026 and 2027 are Department of Veterans Affairs ($9,843,898,122), Defense Health Agency ($688,712,358) and Department of Health and Human Services ($361,541,116).
Which PSC codes are used with NAICS 621?
The PSC codes with the most obligated under NAICS 621 in fiscal years 2026 and 2027 are Q403 Medical Evaluation and Screening Services, Q999 Other Medical Services and Q201 Medical – Managed Healthcare.
Where is the work under NAICS 621 performed?
By place of performance, the states with the most contract obligations under NAICS 621 over the last 12 months are Texas ($4,067,049,143), Florida ($2,071,111,686) and Wisconsin ($1,845,347,584).
What is the latest contract opportunity under NAICS 621?
The latest contract opportunity under NAICS 621 is Q201-- FY26 SS ELA CBOC Contract, limited / sole source justification from Veterans Integrated Service Network 22 (VHA), posted November 12, 2026.
On GovTribe
See everything under NAICS 621
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