PSC Q505

Overview

The Product Service Code (PSC) system is the federal government’s standardized taxonomy for classifying purchased products and services. PSCs are recorded in FPDS as the “Product or Service Code” data element and are maintained in the PSC Manual on Acquisition.gov. These codes enable spend visibility, category management, and consistent reporting across agencies. ¹

PSC Q505 — Medical- Gastroenterology covers physician-level gastroenterology care (adult and pediatric) and physician assistants providing GI services under physician oversight. The PSC Manual lists includes and excludes used to determine when Q505 is the appropriate code for FPDS reporting. ¹

See also on G2X:

• PSC Q505
• PSC Q401
• PSC Q523
• PSC Q509

What this PSC covers

• Gastroenterology physicians (MD and DO) providing clinical GI services. ¹
• Physician assistants delivering gastroenterology care under physician oversight. ¹
• Adult gastroenterology services. ¹
• Pediatric gastroenterology services. ¹
• Professional GI diagnostic and consultative services when GI is the predominant service. ¹

Related NAICS and PSC codes

Type | Code | Descriptor

• | - | - PSC | Q401 | Nursing services (excluded from Q505; PSC Manual cross-references Q401 as the nursing category).
  PSC | Q509 | Family and internal medicine services (distinct from Q505 gastroenterology).
  PSC | Q523 | Surgery services (colorectal, general, or trauma surgeons are excluded from Q505).

(All related-code descriptors derive from the PSC Manual’s includes/excludes and category text.) ¹

Contracting notes

• FPDS reporting: the PSC is entered in FPDS data element 8A and should reflect the predominant good or service purchased; if gastroenterology is the primary labor/service, Q505 is the appropriate PSC. ¹
• Scope and exclusions: Q505 excludes colorectal/general/trauma surgeons and many nursing categories; contracting officers should align labor categories and deliverables to the PSC Manual includes/excludes when coding actions. ¹
• NAICS pairing: the PSC Manual does not prescribe an official NAICS code mapping for Q505; NAICS selection is agency-driven. Not specified by official sources ¹.

Frequently asked questions

• Q: What personnel are explicitly included under PSC Q505?
  A: The PSC Manual identifies physicians (MD and DO) and physician assistants practicing adult and pediatric gastroenterology as included under Q505. Use that guidance when assigning the PSC in FPDS. ¹

• Q: Which services should not be coded to Q505?
  A: Services performed by colorectal, general, or trauma surgeons; family/internal medicine physicians; and nursing staff are excluded and should be coded to their respective PSCs (for example, Q523, Q509, Q401). ¹

• Q: Is there a required NAICS for Q505 solicitations?
  A: The PSC Manual does not assign or require a specific NAICS for Q505; procuring agencies select NAICS based on the predominant industry classification for the acquisition. Not specified by official sources. ¹

• Q: How should multi-discipline contracts involving GI services be coded?
  A: For multi-discipline actions, FPDS should use the PSC that represents the predominant service being procured; the PSC Manual emphasizes selecting the code for the primary product or service. For FPDS coding guidance, consult FPDS resources. ²

Useful resources

• PSC [Q505] on G2X: https://app.g2xchange.com/psc/Q505
• Product and Service Code Manual (PSC Manual), Acquisition.gov. ¹
• FPDS reference — PSC, NAICS and related data elements. ²

References

1. Product and Service Code Manual (PSC Manual), April 2025, Acquisition.gov — PSC Manual PDF. https://www.acquisition.gov/sites/default/files/manual/PSC%20Manual%20April%202025.pdf

2. FPDS — PSC, NAICS and more. https://www.fpds.gov/wiki/index.php/PSC%2C_NAICS_and_more