Tierney Kristoff
Tierney Kristoff is a provider specialising in Dentist in Norwalk, CT, registered under NPI 1003506478. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
Here is what surrounds this office in Norwalk, based on OpenStreetMap data collected Oct 1, 2026. Parking is available about 547 ft away. The nearest transit stop is 0.40 mi away, served by Norwalk DMV. If you arrive early, there is a coffee shop 0.31 mi away.
Getting here and what is nearby
Restaurant Qdoba 0.00 mi ~1 min
652 Main Avenue, Norwalk 06851
Mo-Sa 10:30-22:00; Su 10:30-21:00
Restaurant Panera Bread 33 ft ~1 min
Parking 135 ft ~1 min
Parking 425 ft ~2 min
Gas station Shell 532 ft ~3 min
Parking 547 ft ~3 min
Restaurant Chez Jack 705 ft ~3 min
666 Main Avenue, Norwalk 06851
Tu-Fr 08:00-15:00; Sa-Su 09:00-14:00
Hotel Hilton Garden Inn Norwalk 0.27 mi ~6 min
Coffee Starbucks 0.31 mi ~7 min
Gas station Shell 0.33 mi ~7 min
Transit Norwalk DMV 0.37 mi ~8 min
Transit Norwalk DMV 0.40 mi ~8 min
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 13958 | CT | Dentist primary |
This provider holds licence 13958 issued in CT. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
This NPI does not appear in the PECOS Medicare enrolment file. Providers who do not bill Medicare — or who bill only through a group's enrolment — will not appear here. It is not a sign of any problem with the registration.
What Dentist covers
A dentist is a person qualified by a doctorate in dental surgery (D.D.S.) or dental medicine (D.M.D.), licensed by the state to practice dentistry, and practicing within the scope of that license. There is no difference between the two degrees: dentists who have a DMD or DDS have the same education. Universities have the prerogative to determine what degree is awarded. Both degrees use the same curriculum requirements set by the American Dental Association's Commission on Dental Accreditation. Generally, three or more years of undergraduate education plus four years of dental school is required to graduate and become a general dentist. State licensing boards accept either degree as equivalent, and both degrees allow licensed individuals to practice the same scope of general dentistry. Additional post-graduate training is required to become a dental specialist. NUCC Health Care Provider Taxonomy, code 122300000X
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1003506478 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | May 10, 2023 |
| Last updated | Aug 26, 2026 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Female |
| Practice address |
652 MAIN AVE Norwalk, CT 06851 (203) 854-5458 |
| Mailing address |
219 BENNETTS FARM RD Ridgefield, CT 06877 |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 0 | 0 | 3 | 5 | 0 | 6 | 4 | 7 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 1 | 0 | 3 | 4 | 5 |
Sum = 42 · next multiple of 10 = 50 · check digit = 8 · actual last digit = 8
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.