What Is NAICS 621111?

NAICS code 621111 is a six-digit industry classification code used by the federal government to categorize businesses engaged in offices of physicians (except mental health specialists). When a federal agency issues a solicitation, the contracting officer assigns a NAICS code that best describes the principal purpose of the acquisition. This code determines the applicable small business size standard and influences which set-aside programs may apply to the procurement.

Contractors should include NAICS 621111 in their SAM.gov profile if their business performs work in this industry. Having the correct NAICS codes in your registration is critical — it affects your visibility in agency market research, your eligibility for size-based set-asides, and your ability to self-certify as a small business for specific procurements.

Top Contractors in NAICS 621111

The following table lists the largest federal contractors classified under NAICS 621111, ranked by total obligated dollars. These represent the incumbent competitors in this market space. Understanding who the top players are, where they're located, and how much they receive helps new entrants assess the competitive landscape and identify potential teaming or subcontracting partners.

How to Compete for NAICS 621111 Contracts

Pursuing federal contracts under NAICS 621111 requires a combination of proper registration, market intelligence, and proposal capability. The following steps outline the typical approach for contractors entering or expanding in this market:

• Verify your SAM.gov registration includes NAICS 621111 — this ensures your business appears when agencies conduct market research in this industry.
• Assess your size status against the applicable size standard. If you qualify as small, you may be eligible for set-aside contracts reserved for small businesses, 8(a) firms, HUBZone businesses, or other socioeconomic categories.
• Search active solicitations on SAM.gov filtered by NAICS 621111 to find current opportunities.
• Analyze the competitive landscape using the contractor list above. Identify potential teaming partners among incumbent contractors, especially if you lack past performance in this market.
• Build relevant past performance through subcontracting, commercial contracts, or smaller government awards. See our past performance guide.

• What is NAICS code 621111?

  NAICS code 621111 classifies businesses engaged in offices of physicians (except mental health specialists). It is part of the Health Care and Social Assistance sector (62). Federal agencies assign this code to contract solicitations when the primary purpose of the acquisition involves offices of physicians (except mental health specialists). The code determines which SBA size standard applies for small business eligibility.

• What is the small business size standard for NAICS 621111?

  The SBA small business size standard for NAICS 621111 is determined by the SBA. A business at or below this threshold qualifies as small for federal set-aside contracts using this NAICS code. Size is typically measured as a three-year average of annual receipts or as current number of employees, depending on the industry.

• Who are the top federal contractors in NAICS 621111?

  The top federal contractors in NAICS 621111 include QTC Medical Services Inc, Optumserve Health Services, Inc., KBR WYLE Services, LLC, and others. See the full ranked list above for all top contractors, their locations, and total obligation amounts.

• How do I find the right NAICS code for my business?

  Select the NAICS code that best describes your primary business activity. You can register for multiple codes on SAM.gov. Look at what codes your competitors use, what codes appear on contracts you want to compete for, and review the official code descriptions from the Census Bureau. For detailed guidance, see our NAICS code selection guide.

• How much federal spending goes to NAICS 621111?

  Federal agencies have obligated $8,485,768,944 under NAICS 621111.