Shawn Hallett, DDS, PHD
Shawn Hallett, DDS, PHD is a provider specialising in Dentist in Somerville, MA, registered under NPI 1003706839.
Getting there
Here is what surrounds this office in Somerville, based on OpenStreetMap data collected Oct 2, 2026. Parking is available about 0.43 mi away. There is EV charging 434 ft from the office — useful if you are driving in from out of town. The nearest transit stop is 1,002 ft away, served by Cambridge St @ Sixth St. A pharmacy sits 0.31 mi from the entrance (Cambridge Medical Supply), which helps if you leave with a prescription. If you arrive early, there is a coffee shop 0.31 mi away.
Getting here and what is nearby
Restaurant Dunkin' 0.00 mi ~1 min
14 McGrath Highway, Somerville 02143
05:00-20:00
EV charging 434 ft ~2 min
Pharmacy CHA Pharmacy East Cambridge 500 ft ~2 min
163 Gore Street
Mo,Tu,Th,Fr 08:00-17:00; We 08:00-19:00; Sa 08:00-12:00
Grocery Star Market 537 ft ~3 min
14 McGrath Highway, Somerville 02143
Mo-Su 06:00-24:00
Restaurant McDonald's 806 ft ~4 min
Transit McGrath Hwy opp Twin City Plaza 909 ft ~4 min
Restaurant 9Zaab Thai Street Food 891 ft ~4 min
569 Cambridge Street, Cambridge 02141
Tu-Su 11:00-21:00
Transit Cambridge St @ Lambert St 963 ft ~4 min
Coffee Elmendorf Baking Supplies 962 ft ~4 min
594 Cambridge Street
Tu-Fr 08:00-16:00; Sa 09:00-17:00; Su 09:00-16:00
Transit Cambridge St @ Sixth St 1,002 ft ~4 min
Parking 1,013 ft ~4 min
Convenience Luigi's Variety 0.20 mi ~4 min
520 Cambridge Street
Coffee Call Me Honey 0.22 mi ~5 min
441 Cambridge Street, Cambridge 02141
Mo-Fr 07:00-14:00; Sa,Su 08:00-14:00
Hotel Holiday Inn Express Hotel & Suites 0.22 mi ~5 min
Gas station Shell 0.25 mi ~5 min
239 Monsignor O'Brien Highway, Cambridge 02141
Pharmacy CVS Pharmacy 0.29 mi ~6 min
Grocery Target 0.29 mi ~6 min
Mo-Su 07:00-22:00
Coffee Starbucks 0.31 mi ~7 min
180 Somerville Avenue, Somerville 02143
Mo-Su 08:00-20:00
Pharmacy Cambridge Medical Supply 0.31 mi ~7 min
Hotel Fairfield Inn and Suites 0.32 mi ~7 min
Hotel Hampton Inn Boston/Cambridge 0.39 mi ~8 min
Gas station Shell 0.41 mi ~9 min
1001 Cambridge Street, Cambridge 02141
Parking Lot 11 - Windsor St at Cambridge St 0.43 mi ~9 min
Parking 0.43 mi ~9 min
481 Columbia Street
Convenience Isai Market 0.47 mi ~10 min
161 Washington Street, Somerville 02143
Convenience Lucky Corner 0.47 mi ~10 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 |
|---|---|---|
| DN10001057 | MA | Dentist primary |
This provider holds licence DN10001057 issued in MA. 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 | 1003706839 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jul 3, 2025 |
| Last updated | May 15, 2026 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Credential | DDS, PHD |
| Practice address |
14 MCGRATH HWY Somerville, MA 02143 (617) 934-2164 |
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 | 7 | 0 | 6 | 8 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 5 | 0 | 3 | 8 | 6 |
Sum = 51 · next multiple of 10 = 60 · check digit = 9 · actual last digit = 9
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.