621111 — Offices of Physicians (except Mental Health Specialists)
Description
This U.S. industry comprises establishments of health practitioners having the degree of M.D. (Doctor of Medicine) or D.O. (Doctor of Osteopathic Medicine) primarily engaged in the independent practice of general or specialized medicine (except psychiatry or psychoanalysis) or surgery. These practitioners operate private or group practices in their own offices (e.g., centers, clinics) or in the facilities of others, such as hospitals or HMO medical centers.
Overview Facts
| NAICS Code | 621111 |
|---|---|
| Industry Title | Offices of Physicians (except Mental Health Specialists) |
| SBA Size Standard | $16,000,000 |
| U.S. Establishments | 204,617 (Census CBP, 2023) |
| IRS PBA Code | 621111 (exact match) |
| Sectors Hierarchy | Sector 62 → 621 → 6211 |
| JSON Endpoint | View as JSON · API → |
| Source / Verified | US Census 2022 NAICS Manual, Census CBP / 2026-06-28 |
💡 Expert Guidance & SBA Tips
SBA Audit Tip: Since NAICS 621111 utilizes a receipts-based size standard ($16,000,000), the SBA calculates your size using your average annual gross receipts over the last five fiscal years (13 CFR § 121.104). Be sure to include cost of goods sold (COGS) in your gross receipts calculation, as the SBA does not allow COGS deductions.
Legacy SIC Concordance
Trace the historical mapping chain from the 1987 Standard Industrial Classification (SIC) to the modern 2022 NAICS code format.
- SIC 8011 - Offices and Clinics of Doctors of Medicine (via SIC1987:8011→NAICS1997:621111→2002:621111→2007:621111→2012:621111→2017:621111→2022:621111)
- SIC 8031 - Offices and Clinics of Doctors of Osteopathy (via SIC1987:8031→NAICS1997:621111→2002:621111→2007:621111→2012:621111→2017:621111→2022:621111)
Suggested Product Service Codes (Advisory)
The following Product Service Codes (PSCs) are advisory suggestions aligned with this NAICS code. Note: NAICS and PSC codes map to different dimensions of procurement (industry vs. product/service). There is no official binding 1:1 crosswalk.
- PSC Q999 — Other Medical Services
Source: DoD DPCAP PSC Selection Tool (Ingested: 2026-06-29)
Frequently Asked Questions (FAQ)
Is NAICS code 621111 an active industry classification in 2022? ▾
Yes, NAICS code 621111 is a fully active classification for 'Offices of Physicians (except Mental Health Specialists)' in the U.S. Census Bureau's 2022 vintage. It groups businesses by production process under Sector 62 (Health Care and Social Assistance), Subsector 621, and Group 6211.
What is the SBA small business size standard for NAICS code 621111? ▾
The SBA size standard limit for NAICS code 621111 is $16,000,000. Firms whose receipts (averaged over five years) or employee headcounts (averaged over 24 months) are below this threshold qualify for federal contracting set-asides.
What are the legacy SIC code equivalents mapped to NAICS 621111? ▾
Legacy 1987 SIC codes mapped to NAICS 621111 include: SIC 8011 (Offices and Clinics of Doctors of Medicine), SIC 8031 (Offices and Clinics of Doctors of Osteopathy). Mappings are resolved transitively across successive Census concordances to preserve historical risk profiles in B2B databases.
What IRS Principal Business Activity (PBA) code matches NAICS 621111? ▾
The IRS PBA tax code matching NAICS 621111 is 621111 (derived via a exact mapping method). Business tax filers must declare this principal business activity code on IRS Schedule C, Form 1120, or Form 1065.
What business activities are classified under NAICS 621111? ▾
Activities classified under NAICS 621111 ('Offices of Physicians (except Mental Health Specialists)') include: various industrial activities in this sector. Companies primarily engaged in these production processes must select this code for compliance records.
What activities are excluded from NAICS code 621111? ▾
Exclusions defined by the Census Bureau for NAICS 621111 include: no direct exclusions. Establishments performing these alternative processes are redirected to use their respective industry codes.
How many active establishments operate under NAICS 621111 in the U.S.? ▾
According to the County Business Patterns (CBP) 2023 dataset, there are 204,617 active establishments with registered payrolls operating under NAICS code 621111 in the United States.
Which Product Service Codes (PSCs) are suggested for NAICS 621111? ▾
Suggested advisory Product Service Codes (PSCs) for NAICS 621111 are: PSC Q999 (Other Medical Services). PSCs classify the specific deliverables procured by the government, complementing the industry-level NAICS classification.
Is NAICS code 621111 standard uniform across all U.S. states? ▾
Yes. The North American Industry Classification System (NAICS) code 621111 is a federal statistical standard overseen by the Census Bureau. It applies uniformly to state LLC filings, banking KYC processes, and federal audits.
Related Pages & Tools
Further regulatory reference links for NAICS code 621111:
- Sector 62 Directory Hub — List of related industries in the Health Care and Social Assistance sector.
- SIC ↔ NAICS Crosswalk Tool — Look up mappings between legacy SIC codes and modern classifications.
- NAICS 621111 to SIC Crosswalk — Bidirectional mapping to legacy SIC codes (Offices of Physicians (except Mental Health Specialists)).
- IRS PBA Code for Dermatologist — Principal Business Activity tax reporting details.
- IRS PBA Code for Healthcare — Principal Business Activity tax reporting details.
- IRS PBA Code for Medical Spa — Principal Business Activity tax reporting details.
- IRS PBA Code for Pediatrician — Principal Business Activity tax reporting details.
- IRS PBA Code for Physician — Principal Business Activity tax reporting details.
- Compare NAICS 621111 vs 621112 — Industrial classification comparison rules (Offices of Physicians (except Mental Health Specialists) vs Offices of Physicians, Mental Health Specialists).
- SBA Size Standards Guide — Complete rules and averaging periods for small business classifications.
- Calculating Annual Receipts Guide — Detailed worked example of revenue calculation rules.
- IRS Principal Business Activity Guide — How NAICS codes map to corporate and entity tax filings.
Sources & References
- U.S. Census Bureau: North American Industry Classification System (NAICS) Manual
- U.S. Small Business Administration (SBA): Table of Small Business Size Standards
- Electronic Code of Federal Regulations (eCFR): 13 CFR Part 121 - Small Business Size Regulations
- Acquisition.gov: Federal Acquisition Regulation (FAR) Part 19 - Small Business Programs
- Internal Revenue Service (IRS): Instructions for Schedule C (Form 1040) Principal Business Activity (PBA) Codes
- U.S. General Services Administration (GSA): System for Award Management (SAM.gov) Unique Entity ID Guide
- Defense Logistics Agency: Defense Logistics Agency (DLA) CAGE Search and Registration
- United Nations Statistics Division: International Standard Industrial Classification of All Economic Activities (ISIC)
- U.S. Occupational Safety and Health Administration (OSHA): Standard Industrial Classification (SIC) Manual
- U.S. Securities and Exchange Commission (SEC): SEC EDGAR Filer Standard Industrial Classification Codes