PSC B599: Special Studies/Analysis – Other
B599 is the product and service code (PSC) federal agencies use for special studies/analysis – other, in the special studies – not r and d group. Here are the contracts open under it now, the NAICS codes it pairs with, and who buys and wins this work.
- Open contracts now
- 1
- Spending, FY2026
- $372.5 million
- Share to small businesses
- 15%
Open contracts with PSC B599, due soonest
- Forensic Polygraph services
✦ The U.S. Probation and Pretrial Services Office for the District of Alaska wants a vendor to give court-ordered polygraph (lie detector) exams to people under federal…
Due in 26 daysNov 6, 2026
Where B599 sits in the PSC Manual
- Category: Service
- Group B: Special Studies/Analysis, Not R&D
- Group B5: Special Studies – Not R and D
- Code B599: Special Studies/Analysis – Other
NAICS codes used with PSC B599
The NAICS code on a contract sets the size standard for who counts as small. These are the codes agencies pair with B599 most often:
| NAICS | Industry | Spent, last 3 years |
|---|---|---|
| 541990 | All Other Professional, Scientific, and Technical Services | $261.8 million |
| 541330 | Engineering Services | $217.2 million |
| 541720 | Research and Development in the Social Sciences and Humanities | $174.8 million |
| 541380 | Testing Laboratories and Services | $135.8 million |
| 541611 | Administrative Management and General Management Consulting Services | $118.1 million |
| 541690 | Other Scientific and Technical Consulting Services | $58.6 million |
| 561611 | Investigation and Personal Background Check Services | On 1 open |
Who buys under PSC B599
Agencies with the most contract dollars under B599 over the last three fiscal years, per USAspending.gov:
| Agency | Obligated |
|---|---|
| Department of the Air Force | $202.6 million |
| National Aeronautics and Space Administration | $183.9 million |
| Substance Abuse and Mental Health Services Administration | $183.6 million |
| National Institutes of Health | $132.4 million |
| Department of the Army | $89.1 million |
| Federal Acquisition Service | $61.8 million |
| Department of the Navy | $48.9 million |
| Department of State | $46 million |
Federal spending under PSC B599 by year
| Fiscal year | Contract obligations |
|---|---|
| FY2024 | $478.3 million |
| FY2025 | $306.5 million |
| FY2026 | $372.5 million |
| FY2027 (so far) | $-151,871 |
Who wins PSC B599 contracts
| Company | Obligated, last 3 years |
|---|---|
| Research Triangle Institute | $192 million |
| Booz Allen Hamilton Inc | $168 million |
| The Rand Corporation | $107.3 million |
| Fors Marsh Group LLC | $60.6 million |
| Mathematica Inc. | $47.3 million |
| American Institute in Taiwan | $43.4 million |
| Janus Research Group, LLC | $37.9 million |
| Emory University | $36.9 million |
| The Broad Institute, Inc | $34.3 million |
| Baylor College of Medicine | $27.7 million |
Related PSC codes
- B502 Special Studies/Analysis – Air Quality
- B503 Special Studies/Analysis – Archeological/Paleontological
- B504 Special Studies/Analysis – Chemical/Biological
- B505 Special Studies/Analysis – Cost Benefit
- B506 Special Studies/Analysis – Data (Other Than Scientific)
- B507 Special Studies/Analysis – Economic
- B509 Special Studies/Analysis – Endangered Species: Plant/Animal
- B510 Special Studies/Analysis – Environmental Assessments
- B513 Special Studies/Analysis – Feasibility (Non – Construction)
- B516 Special Studies/Analysis – Animal/Fisheries
Frequently asked questions
What is PSC B599?
B599 is the service code in the federal Product and Service Code (PSC) Manual for special studies/analysis – other, under B (Special Studies/Analysis, Not R&D) and B5 (Special Studies – Not R and D). Agencies put a PSC on every contract to record what they bought.
What is the difference between a PSC and a NAICS code?
A PSC describes what the government is buying. A NAICS code describes the industry of the business doing the work, and it sets the SBA size standard for small business set-asides. Every contract notice has both.
Which NAICS code goes with PSC B599?
Most federal contract dollars under PSC B599 go with NAICS 541990 (All Other Professional, Scientific, and Technical Services), according to USAspending.gov. The contracting officer picks the NAICS code for each solicitation, so check the notice.
How do I find contracts that use PSC B599?
Contract opportunities are posted on SAM.gov with their PSC and NAICS codes. 1 open notices use PSC B599 right now. FedReady can match new ones to your business and email you, free.