621320 — Offices of Optometrists
Description
This industry comprises establishments of health practitioners having the degree of O.D. (Doctor of Optometry) primarily engaged in the independent practice of optometry. These practitioners examine, diagnose, treat, and manage diseases and disorders of the visual system, the eye, and associated structures as well as diagnose related systemic conditions. Offices of optometrists prescribe and/or provide eyeglasses, contact lenses, low vision aids, and vision therapy. They 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, and may also provide the same services as opticians, such as selling and fitting prescription eyeglasses and contact lenses.
Exclusions & Cross-References
- Offices of opticians primarily engaged in selling and fitting prescription eyeglasses and contact lenses are
- classified in Industry 456130, Optical Goods Retailers; and
- Offices of physicians primarily engaged in the independent practice of ophthalmology are classified in U.S.
- Industry 621111, Offices of Physicians (except Mental Health Specialists).
Overview Facts
| NAICS Code | 621320 |
|---|---|
| Industry Title | Offices of Optometrists |
| SBA Size Standard | $9,000,000 |
| IRS PBA Code | 621320 (exact match) |
| Sectors Hierarchy | Sector 62 → 621 → 6213 |
| Source / Verified | US Census 2022 NAICS Manual / 2026-06-28 |
Legacy SIC Concordance
Trace the historical mapping chain from the 1987 Standard Industrial Classification (SIC) to the modern 2022 NAICS code format.
- SIC 8042 - Offices and Clinics of Optometrists (via SIC1987:8042→NAICS1997:62132→2002:621320→2007:621320→2012:621320→2017:621320→2022:621320)
Related Resources & Compliance Guides
Further regulatory reference links for NAICS code 621320:
- 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.
- 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.
Related Industries in 6213
Frequently Asked Questions (FAQ)
Is 621320 a valid 2022 NAICS code?
NAICS 621320 is 'Offices of Optometrists', a 2022 U.S. national industry under Sector 62 (Health Care and Social Assistance); the SBA small-business size standard is $9,000,000.
What is the SBA size standard for NAICS 621320?
The SBA small business size standard for NAICS 621320 is $9,000,000 (based on receipts).
What is the legacy SIC code mapping for 621320?
NAICS code 621320 maps to the legacy 1987 SIC codes: 8042 - Offices and Clinics of Optometrists.