Isabelle Zamfirescu, MD
Endocrinology, Diabetes & Metabolism Physician · South Weymouth, MA
Isabelle Zamfirescu, MD is an endocrinology, diabetes & metabolism physician with a practice address in South Weymouth, Massachusetts, and NPI 1881802031, issued on May 20, 2007. Check the license (Massachusetts 242591, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Isabelle Zamfirescu
- Credential
- MD
- Primary taxonomy
- Endocrinology, Diabetes & Metabolism Physician 207RE0101X
- License number
- 242591 MA
Self-reported in NPPES; status is on the state search - Practice location
- 541 Main St, South Weymouth, MA 02190
- Phone
- (781) 952-1280
- Enumerated
- May 20, 2007
- Record last updated
- Apr 20, 2010 (not updated in 16 years: call before relying on the address or phone)
- Fax
- (781) 952-1570
- Medicare enrollment
- Enrolled (PECOS I20100820000609); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest endocrinology, diabetes & metabolism physician records → All 522 in Massachusetts → Look up another NPI →
Also registered at 541 Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Dana AnstettMental Health Counselor1770857286
- Tara Armstrong, PA-CMedical Physician Assistant1811049414
- Richard Ashburn, MDPulmonary Disease Physician1861492746
- John Casey, D.C.Chiropractor1700805181
- Charles Chalko, D.O.Internal Medicine Physician1548218126
- Jeanne Colton, NPNurse Practitioner1992782072
Verify Isabelle Zamfirescu in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 242591Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
77% more Medicare Part D claims than the average endocrinology, diabetes & metabolism physician in 2024
4,642 Medicare Part D claims for 701 beneficiaries, against an average of 2,630 among the 8,223 providers of this specialty who prescribed in Part D. Brand-name drugs were 43% of claims. 13 claims were for opioids.
Most prescribed
- Levothyroxine Sodium430 claims
- Ozempic314 claims
- Metformin Hcl Er261 claims
- Glipizide Er218 claims
- Nano 2nd Gen Pen Needle186 claims
- Atorvastatin Calcium178 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.
Industry payments in 2024: $109.98
1 payment: long term medical supply or device loan; the largest payer was Abbott Laboratories. The 5,661 providers of this specialty with any payment received $5,742.15 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- Harbor Medical Associates IncSouth Weymouth, MA
- Mass General Brigham Medical Group Suburban Massachusetts IncNewton, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Isabelle Zamfirescu among 522 endocrinology, diabetes & metabolism physician records in Massachusetts
Isabelle Zamfirescu, MD is one of 522 endocrinology, diabetes & metabolism physician records with a practice address in Massachusetts. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2007, is newer than 48% of them.
- NPI issued2007 · 48% of these records are older, 40% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 72% of these records are
- Graduated2005 · median 2002 among the 378 with a school on file
- Record last updated2010 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RE0101X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
5 endocrinology, diabetes & metabolism physician records list a practice address in South Weymouth
They are 5 of the 445 NPPES records with a practice address in South Weymouth, and 522 endocrinology, diabetes & metabolism physician records in Massachusetts.
All 522 in Massachusetts → Every provider in South Weymouth → Endocrinology, Diabetes & Metabolism Physician nationwide →
The 8 endocrinology, diabetes & metabolism physician records with the nearest ZIP codes
- Mary Delaney, MDSouth Weymouth, MA 021901336149228
- Kristin Helm, MDSouth Weymouth, MA 021901336357763
- Abby Landzberg, MDSouth Weymouth, MA 021901629055728
- Richard Mirel, M.D.Weymouth, MA 021901437150174
- Laura Selkirk, M.D.South Weymouth, MA 021901548478548
- Monika Konopka, MDMilton, MA 021861184691628
- Peter Roos, MDMilton, MA 021861619962255
- Rodrigo Valderrabano, M.D.Braintree, MA 021841184805186
Common questions
What is Isabelle Zamfirescu, MD's NPI number?
Isabelle Zamfirescu, MD's National Provider Identifier (NPI) is 1881802031, issued on May 20, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Isabelle Zamfirescu, MD located?
The NPPES record lists a practice address at 541 Main St, South Weymouth, MA, 02190. Phone: (781) 952-1280. Providers update this record themselves, so call before visiting.
How can I verify Isabelle Zamfirescu, MD's license?
NPPES lists Massachusetts license number 242591, 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 Isabelle Zamfirescu, MD prescribe under Medicare Part D?
In 2024, Isabelle Zamfirescu, MD had 4,642 Medicare Part D claims for 701 beneficiaries; the average among endocrinology, diabetes & metabolism physician prescribers was 2,630. 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.