Justin Nathaniel Dorfman, D.O.
Internal Medicine Physician · Southborough, MA
Justin Nathaniel Dorfman, D.O. is an internal medicine physician with a practice address in Southborough, Massachusetts, and NPI 1053339432, issued on Jul 17, 2006. Check the license (Massachusetts 226691, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Justin Nathaniel Dorfman
- Credential
- D.O.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 226691 MA
Self-reported in NPPES; status is on the state search - Practice location
- 24 Newton St, Southborough, MA 01772
- Phone
- (508) 460-3250
- Enumerated
- Jul 17, 2006
- Record last updated
- Jun 2, 2011 (not updated in 15 years: call before relying on the address or phone)
- Medicaid ID
- 2115441 MA
- Medicare enrollment
- Enrolled (PECOS I20060809000085); accepts Medicare assignment
- Medical or professional school
- Lake Erie College Of Osteopathic Medicine, Erie, 2002
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 6,825 in Massachusetts → Look up another NPI →
Also registered at 24 Newton St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Christine Abraham, NPFamily Nurse Practitioner1215774658
- Namra ArifPsychologist1750865077
- Elizabeth Askew, O.D.Optometrist1427078120
- Iphigenia Balodimos, M.D.Obstetrics & Gynecology Physician1619900685
- Matthew Bean, M.D.Internal Medicine Physician1730107244
- Sarah Bechta, M.D.Pediatrics Physician1932124427
Verify Justin Nathaniel Dorfman in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 226691Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
5% fewer Medicare Part D claims than the average internal medicine physician in 2024
3,015 Medicare Part D claims for 414 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 137 claims were for opioids.
Most prescribed
- Atorvastatin Calcium248 claims
- Lisinopril194 claims
- Simvastatin182 claims
- Amlodipine Besylate116 claims
- Gabapentin98 claims
- Levothyroxine Sodium94 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 IncSouthborough, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Justin Nathaniel Dorfman among 6,825 internal medicine physician records in Massachusetts
Justin Nathaniel Dorfman, D.O. 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 2006, is newer than 12% of them.
- NPI issued2006 · 12% of these records are older, 54% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 60% of these records are
- Graduated2002 · median 2004 among the 4,103 with a school on file
- Record last updated2011 · 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).
12 internal medicine physician records list a practice address in Southborough
They are 12 of the 481 NPPES records with a practice address in Southborough, and 6,825 internal medicine physician records in Massachusetts.
All 6,825 in Massachusetts → Every provider in Southborough → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Hassna Atlassi, MDSouthborough, MA 017721326107541
- Matthew Bean, M.D.Southborough, MA 017721730107244
- Frank Chau, M.D.Southborough, MA 017721003840315
- Mario Flores, MDSouthborough, MA 017721437103439
- Deidre Hein, DOSouthborough, MA 017721184023103
- James Howe, M.D.Southboro, MA 017721467499129
- Robert Jandl, M.D.Southborough, MA 017721770572315
- Javeria Kouser, M.DSouthborough, MA 017721801062104
Common questions
What is Justin Nathaniel Dorfman, D.O.'s NPI number?
Justin Nathaniel Dorfman, D.O.'s National Provider Identifier (NPI) is 1053339432, issued on Jul 17, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Justin Nathaniel Dorfman, D.O. located?
The NPPES record lists a practice address at 24 Newton St, Southborough, MA, 01772. Phone: (508) 460-3250. Providers update this record themselves, so call before visiting.
How can I verify Justin Nathaniel Dorfman, D.O.'s license?
NPPES lists Massachusetts license number 226691, 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 Justin Nathaniel Dorfman, D.O. prescribe under Medicare Part D?
In 2024, Justin Nathaniel Dorfman, D.O. had 3,015 Medicare Part D claims for 414 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.