If you own or operate a medical office and need your NAICS code, here is your answer right away.
The primary NAICS code for a general medical office is 621111, classified under Offices of Physicians (Except Mental Health) in the Health Care and Social Assistance sector. However, “medical office” is a broad term. The right code for your practice depends entirely on the type of medical professional providing care and how your clinic is structured. This page covers the relevant codes so you can identify the one that fits.
| Field | Details |
|---|---|
| NAICS Code | 621111 |
| Industry Title | Offices of Physicians (Except Mental Health) |
| Sector | 62 (Health Care and Social Assistance) |
| Industry Group | 621 |
| Last Updated | 2022 NAICS Edition (Next NAICS Edition will come in 2027) |
What Does NAICS Code 621111 Cover?
According to the official 2022 NAICS data, code 621111 covers establishments primarily engaged in providing medical care by licensed physicians (Doctors of Medicine or Osteopathy).
In simple terms, this is the code for traditional doctor’s offices and specialist clinics where a physician is actively diagnosing illnesses, prescribing medications, and overseeing patient care. For medical offices, this includes:
- Family medicine, internal medicine, and pediatric practices
- Specialist physician offices (e.g., cardiology, dermatology, orthopedics, obstetrics)
- Walk-in clinics and urgent care centers where patients are seen by a physician
- Group medical practices employing multiple physicians
- Outpatient care facilities where a physician is the primary provider of care
The important distinction here is physician-led care. This code covers clinics where a medical doctor (MD or DO) is diagnosing and treating patients, rather than other types of healthcare providers offering allied health services.
Does My Medical Office Qualify for Code 621111?
Your medical office qualifies for NAICS code 621111 if:
- You operate a practice where a licensed physician (MD or DO) is actively seeing patients
- Your main source of revenue comes from physician-led consultations, diagnoses, and treatments
- Your practice bills insurance under the physician’s NPI number
Your business may not qualify if:
- You operate a psychiatrist or psychoanalyst office, which falls under 621112 (Offices of Physicians, Mental Health Specialists) instead
- You operate a dental or orthodontic practice, which falls under 621210 (Offices of Dentists) instead
- You operate a chiropractic office, which falls under 621310 (Offices of Chiropractors) instead
- You operate an independent clinic staffed entirely by Nurse Practitioners (NPs) or Physician Assistants (PAs) without a supervising physician on staff, which falls under 621399 (All Other Miscellaneous Health Practitioners) instead
- You provide physical therapy or occupational therapy, which falls under 621340 (Offices of Physical, Occupational and Speech Therapists, and Audiologists) instead
When your medical office sits between two codes, always classify based on the primary licensing and billing structure of the providers.
Where Will You Need This Code?
Your NAICS code appears in more places than most healthcare administrators expect. Here is where code 621111 will be required:
- Medical Malpractice Insurance. This is highly critical. Insurance carriers use this code to calculate your premiums for Medical Professional Liability (Malpractice) insurance. Even though a cardiologist and a family doctor share the 621111 code, underwriters use it as the baseline to evaluate your clinic’s overall risk profile before adjusting for the specific specialty.
- Insurance Credentialing and Payer Enrollment. When you apply to be an in-network provider for commercial insurance panels or enroll in Medicare/Medicaid through CMS, you must provide this NAICS code to classify your practice type accurately.
- Tax Filings and QBI Deductions. Federal and state tax agencies use NAICS codes to categorize your business. This is incredibly important for tax planning, as code 621111 is one of the specific “specified service trades or businesses” (SSTBs) that determines your eligibility for the IRS Section 199A Qualified Business Income (QBI) deduction.
- EHR/EMR Software Applications. Electronic Health Record vendors (like Epic, Athenahealth, or DrChrono) require your NAICS code during the software purchasing and implementation process to tailor their platform to your clinic type.
- Business Registration. Most state medical boards and business registration portals ask for your NAICS code when you set up a professional LLC or PLLC for your practice.
621111 in the NAICS Hierarchy
Every NAICS code sits inside a structured hierarchy. Here is exactly where 621111 fits:
| Level | Code | Title |
|---|---|---|
| Sector | 62 | Health Care and Social Assistance |
| Subsector | 621 | Ambulatory Health Care Services |
| Industry Group | 6211 | Offices of Physicians |
| NAICS Industry | 62111 | Offices of Physicians (Except Mental Health) |
| National Industry | 621111 | Offices of Physicians (Except Mental Health) |
Frequently Asked Questions
What is the NAICS code for an urgent care clinic?
If your urgent care clinic is staffed by licensed physicians (MDs or DOs) who diagnose and treat patients, you use 621111. The speed of the care doesn’t change the classification, as long as a physician is providing the treatment.
What if my clinic is staffed entirely by Nurse Practitioners (NPs) or Physician Assistants (PAs)?
If NPs or PAs own and operate a clinic independently without a physician on staff, the federal government classifies this under 621399 (All Other Miscellaneous Health Practitioners). You cannot use 621111 unless a physician is actively practicing at the clinic. Note: If the NP/PA bills “incident to” a physician’s oversight at a larger facility, the overarching practice usually uses 621111, but an independent NP clinic uses 621399.
Does code 621111 cover a psychiatry practice?
No. The federal government separates mental health physicians from general medical physicians. A private practice owned by a psychiatrist or psychoanalyst must use 621112 (Offices of Physicians, Mental Health Specialists).
What is the NAICS code for an optometrist’s office?
No. Eye doctors providing vision care, prescribing glasses, and diagnosing eye diseases are classified under their own specific code: 621320 (Offices of Optometrists).