Eric J. Nielsen, MD
Internal Medicine Physician · Shrewsbury, MA
Eric J. Nielsen, MD is an internal medicine physician with a practice address in Shrewsbury, Massachusetts, and NPI 1952750556, issued on Jun 6, 2016. Check the license (Massachusetts 1017771, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Eric J. Nielsen
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License numbers
- 1017771 MA
0101263082 VA
Self-reported in NPPES; status is on the state search - Practice location
- 378 Maple Ave, Shrewsbury, MA 01545
- Phone
- (508) 368-7820
- Enumerated
- Jun 6, 2016
- Record last updated
- Sep 6, 2024
- Medicare enrollment
- Enrolled (PECOS I20241004001621); accepts Medicare assignment
- Medical or professional school
- University Of Rochester School Of Medicine And Dentistry, 2016
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 6,825 in Massachusetts → Look up another NPI →
Also registered at 378 Maple Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Demetrios Carellas, PA-CPhysician Assistant1568133072
- Jessica Erickson, FNPFamily Nurse Practitioner1891211603
- Neha Esmaeili, MDPediatrics Physician1689203382
- Florence Gichuhi, NPPrimary Care Nurse Practitioner1548742364
- Sabitha Gopalswamy, MDInternal Medicine Physician1841253234
- Prashantha Holla, MDInternal Medicine Physician1174663207
Verify Eric J. Nielsen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 1017771Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
91% fewer Medicare Part D claims than the average internal medicine physician in 2024
290 Medicare Part D claims for 97 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Lisinopril21 claims
- Rosuvastatin Calcium19 claims
- Metoprolol Tartrate14 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.
Bills Medicare through one group practice
- Reliant Medical Group IncShrewsbury, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Eric J. Nielsen among 6,825 internal medicine physician records in Massachusetts
Eric J. Nielsen, MD is one of 6,825 internal medicine physician records with a practice address in Massachusetts. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2016, is newer than 77% of them.
- NPI issued2016 · 77% of these records are older, 21% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2016 · median 2004 among the 4,103 with a school on file
- Record last updated2024 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
28 internal medicine physician records list a practice address in Shrewsbury
They are 28 of the 550 NPPES records with a practice address in Shrewsbury, and 6,825 internal medicine physician records in Massachusetts.
All 6,825 in Massachusetts → Every provider in Shrewsbury → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Sarika Aggarwal, M.D.Shrewsbury, MA 015451265415236
- Durga Bathini, M.D.Shrewsbury, MA 015451093798076
- June Blanco, M.D.Shrewsbury, MA 015451548242787
- Heather Gallo, M.D.Shrewsbury, MA 015451326021189
- Deborah Hazen, M.D.Shrewsbury, MA 015451427038645
- Preeti Jain, MDShrewsbury, MA 015451801860192
- Mary O'Brien, M.D.Shrewsbury, MA 015451912980434
- Afroz Saquib, M.D.Shrewsbury, MA 015451558344457
Common questions
What is Eric J. Nielsen, MD's NPI number?
Eric J. Nielsen, MD's National Provider Identifier (NPI) is 1952750556, issued on Jun 6, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Eric J. Nielsen, MD located?
The NPPES record lists a practice address at 378 Maple Ave, Shrewsbury, MA, 01545. Phone: (508) 368-7820. Providers update this record themselves, so call before visiting.
How can I verify Eric J. Nielsen, MD's license?
NPPES lists Massachusetts license number 1017771, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Eric J. Nielsen, MD prescribe under Medicare Part D?
In 2024, Eric J. Nielsen, MD had 290 Medicare Part D claims for 97 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.