PSC H399

Overview

The Product Service Code (PSC) system is the U.S. federal procurement taxonomy used to classify goods and services in award records (FPDS, SAM, and related systems). PSCs enable obligation tracking, spend analysis, and portfolio reporting; the Product and Service Code Manual on Acquisition.gov is the governing reference for PSC definitions, assignment rules, and maintenance processes. ¹

PSC H399 — Inspection‑ Miscellaneous — is the PSC label applied to inspection, verification, and related quality‑control services that do not fit a more specific H‑series inspection code. Agencies and contracting officers commonly use H399 for discrete, non‑routine inspection tasks and short‑term assessment services; award summaries and FPDS records typically display H399 as "INSPECTION‑ MISCELLANEOUS." ²

• See also on G2X:
  • PSC H399
  • PSC H999
  • PSC H925

What this PSC covers

• Miscellaneous inspection services and on‑site assessments.
• Quality‑assurance sampling, verification, and acceptance tasks.
• Field inspection of equipment or facilities not covered by a specialized PSC.
• Third‑party verification and compliance audits for non‑regulated items.
• Visual, operational, or functional inspections delivered as discrete deliverables.
• Inspection reporting, documentation, and short‑term task‑order inspection support.

Related NAICS and PSC codes

Not specified by official sources whether there is a formal PSC-to‑NAICS crosswalk for H399; agencies select the NAICS that best describes the primary industry or technical deliverable when awarding H399‑coded requirements. ¹

Common NAICS observed reported with this PSC in award records include NAICS 541990 and NAICS 541350, but NAICS selection varies by solicitation and agency‑specific needs. ²

Observed contracting contexts

• H399 is frequently paired with professional and technical services procurements where inspection is a discrete deliverable, such as engineering‑support site checks, non‑routine equipment acceptance inspections, or contracted verification tasks. FPDS award records commonly show H399 used alongside NAICS entries such as 541990 and 541350. ²

Frequently asked questions

• What does PSC H399 precisely mean on an award?

  • PSC H399 is the label "INSPECTION‑ MISCELLANEOUS" in award records indicating inspection‑type services that lack a more specific H‑series designation. The PSC signals inspection character; the solicitation provides the precise scope and deliverables. ²

• How are NAICS codes chosen when H399 is used?

  • Agencies assign the NAICS code that best describes the primary industry or service procured; PSC H399 indicates inspection activity but does not prescribe a single NAICS mapping. Not specified by official sources. ¹

• Where to find authoritative PSC definitions and updates?

  • The Product and Service Code Manual on Acquisition.gov provides authoritative PSC definitions, assignment guidance, and change history; consult it for official PSC listings and maintenance actions. ¹

• Is H399 limited to physical inspections only?

  • No. Observed awards show PSC H399 applied to a range of inspection, verification, and assessment activities, including documentation reviews, operational verifications, and field assessments that may be non‑physical. ²

• How to search federal awards that used H399?

  • Use FPDS search tools (FPDS‑NG/ezSearch) or USAspending to query PSC H399 and review recent awards, NAICS pairings, and solicitation documents; always read the award/solicitation for exact requirements. ²

Useful resources

• PSC H399 overview (G2X): https://app.g2xchange.com/psc/H399
• Product and Service Code Manual (Acquisition.gov). ¹
• FPDS award search examples showing PSC H399 recorded on awards (FPDS.gov). ²

References

1. Acquisition.GOV — Product and Service Code Manual. https://www.acquisition.gov/psc-manual
2. FPDS — award search / example results (FPDS‑NG / ezSearch). https://www.fpds.gov/ezsearch/search.do