Before you trust someone with your teeth, it is reasonable to confirm that they are who they say they are and that they are licensed to practice. In the United States, two free public tools cover most of this: the federal NPI Registry and your state’s dental board. This guide explains what each one tells you, what it does not, and how to use them together.
What an NPI number is
A National Provider Identifier (NPI) is a unique 10-digit number that identifies a health care provider in a standard way. According to the CMS NPPES NPI Registry, individuals and organizations apply for NPIs through the National Plan and Provider Enumeration System (NPPES), and CMS publishes the parts of each record with public relevance, including the provider’s name, specialty (taxonomy) and practice address.
There are two kinds of NPI records you will see:
- Individual records, for a person such as a dentist or hygienist.
- Organization records, for an entity such as a dental practice or group.
A dentist who works at a group practice may have their own individual NPI while the practice has a separate organizational NPI.
What an NPI does not tell you
This is the most important point. The NPI Registry states plainly that issuance of an NPI does not ensure or validate that the provider is licensed or credentialed. An NPI is an identifier, not a license. To confirm a license, you need the state dental board.
Registry information is also largely self-reported by providers and may lag behind real changes, such as a move to a new office.
How to look up a dentist in the NPI Registry
- Go to the NPI Registry search.
- Enter the dentist’s last name and first name, and narrow by state or city if the name is common. You can also search by NPI number if you already have it.
- Open the matching record and review:
- Name and credential as listed by the provider.
- Primary taxonomy, which shows the type of provider and specialty the dentist selected, such as general practice or a specialty like orthodontics.
- Practice location address.
- Enumeration date and last update, which show when the record was created and last changed.
- Any license number and state listed with the taxonomy.
How to read the taxonomy
The taxonomy is a standardized description of provider type. For dentists, it may show general dentistry or a specialty. Keep in mind that the taxonomy is what the provider selected; for specialty claims, it helps to know which specialties are formally recognized. The ADA National Commission on Recognition of Dental Specialties and Certifying Boards lists the 12 recognized dental specialties and the recognized certifying boards. Our guide to dental specialists explains what each does.
How to verify a dentist’s license
Dental licenses are issued by each state. To check one:
- Find your state’s dental board. The American Association of Dental Boards maintains a list linking to each state dental board’s website, including the District of Columbia.
- On the board’s website, look for a “license lookup” or “verify a license” tool. Some states run lookups through a central professional licensing agency.
- Search by name or license number.
- Check that the license is active, the name matches, and note the expiration date.
- Look for public disciplinary actions or license restrictions. Many boards publish these, though the format varies.
If a dentist practices in more than one state, they need a license in each one. A lookup in one state says nothing about another.
Putting it together
A sensible check looks like this:
- The state board confirms the license is active and shows any public discipline.
- The NPI Registry confirms the provider identity, listed specialty and practice address.
- The practice website and phone call confirm current location, hours and insurance.
If the details do not line up (for example, a different name, an inactive license, or a specialty claim that does not match the record), ask the office about it, or contact the state board.
How our directory uses NPI data
Listings in our dentist directory are built from public NPI Registry data, organized by state and city. That means each listing reflects what the provider registered with NPPES, not an endorsement and not a license check. We encourage readers to verify licenses with the state board as described above. If you are a dentist and your details are out of date, you can update your NPPES record and claim or list your practice free on our site.
Other useful checks
- Ask whether a specialist is board-certified, and by which board.
- For sedation, ask about the dentist’s sedation permit; many states issue separate permits.
- Read our guides on how to choose a dentist and what to look for in a dental practice.
Frequently asked questions
Does an NPI number mean a dentist is licensed?
No. The NPI Registry states that having an NPI does not ensure or validate that a provider is licensed or credentialed. Check the state dental board for license status.
How many digits is an NPI?
An NPI is a unique 10-digit number.
Where can I find my state's dental board?
The American Association of Dental Boards maintains a State Board Contact list linking to each state board’s website.
Why does my dentist's NPI show an old address?
NPI records are maintained by providers, and updates can lag. Confirm the current address with the office.
Photo: Ling App / Pexels
Sources
- CMS NPPES NPI Registry
- American Association of Dental Boards – State Board Contact list
- ADA National Commission on Recognition of Dental Specialties and Certifying Boards – Recognized Dental Specialties
By the Dentists Reviews Editorial Team.
This is general information, not medical advice. Talk to a licensed dentist about your own situation. See our disclaimer.
