Gregory Nielsen
General Practice Dentistry · North Billerica, MA
Gregory Nielsen is a general practice dentistry with a practice address in North Billerica, Massachusetts, and NPI 1629606181, issued on Mar 31, 2020. Check the license (Massachusetts DN1859444, as entered in NPPES) with the Massachusetts board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Gregory Nielsen
- Primary taxonomy
- General Practice Dentistry 1223G0001X
- License number
- DN1859444 MA
Self-reported in NPPES; status is on the state search - Practice location
- 315 Boston RD, North Billerica, MA 01862
- Phone
- (978) 391-6783
- Enumerated
- Mar 31, 2020
- Record last updated
- Oct 6, 2022
- Entity
- Type 1 · individual
8 nearest general practice dentistry records → All 3,489 in Massachusetts → Look up another NPI →
Also registered at 315 Boston RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Neeti Desai, DMDDentist1396132205
Verify Gregory Nielsen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Massachusetts board licenses this profession
Search for license DN1859444Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
86% fewer Medicare Part D claims than the average general practice dentistry in 2024
12 Medicare Part D claims, against an average of 83 among the 70,290 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Gregory Nielsen among 3,489 general practice dentistry records in Massachusetts
Gregory Nielsen is one of 3,489 general practice dentistry records with a practice address in Massachusetts. 58% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 85% of them.
- NPI issued2020 · 85% of these records are older, 13% newer
- In a Medicare fileYes · 58% of these records are
- In the CMS Doctors and Clinicians fileNo · under 1% of these records are
- Record last updated2022 · 77% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 1223G0001X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
3 general practice dentistry records list a practice address in North Billerica
They are 3 of the 76 NPPES records with a practice address in North Billerica, and 3,489 general practice dentistry records in Massachusetts.
All 3,489 in Massachusetts → Every provider in North Billerica → General Practice Dentistry nationwide →
The 8 general practice dentistry records with the nearest ZIP codes
- Wai Lee, D.M.D.North Billerica, MA 018621235296179
- Richard Pierce, D.M.D.North Billerica, MA 018621083924401
- John Crane, DMDNorth Chelmsford, MA 018631396847174
- Brian McPartland, D.M.D.North Chelmsford, MA 018631013269687
- Paul Murphy, DMDN Chelmsford, MA 018631619045507
- Marc Zauderer, DMDN Chelmsford, MA 018631598799579
- Melinda Armacost, D.D.S.North Reading, MA 018641730229519
- Amer Avdagic, DMDMerrimac, MA 018601285290643
Common questions
What is Gregory Nielsen's NPI number?
Gregory Nielsen's National Provider Identifier (NPI) is 1629606181, issued on Mar 31, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Nielsen located?
The NPPES record lists a practice address at 315 Boston RD, North Billerica, MA, 01862. Phone: (978) 391-6783. Providers update this record themselves, so call before visiting.
How can I verify Gregory Nielsen's license?
NPPES lists Massachusetts license number DN1859444, as entered by the provider. Search the Massachusetts board that licenses this profession; the NPPES record confirms identity only.
How much does Gregory Nielsen prescribe under Medicare Part D?
In 2024, Gregory Nielsen had 12 Medicare Part D claims; the average among general practice dentistry prescribers was 83. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.