John Niedzwicki, M.D.
Medical Oncology Physician · Dartmouth, MA
John Niedzwicki, M.D. is a medical oncology physician with a practice address in Dartmouth, Massachusetts, and NPI 1306812367, issued on Feb 28, 2006. Check the license (Massachusetts 74834, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- John Niedzwicki
- Credential
- M.D.
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License number
- 74834 MA
Self-reported in NPPES; status is on the state search - Practice location
- 535 Faunce Corner RD, Dartmouth, MA 02747
- Phone
- (508) 996-3991
- Enumerated
- Feb 28, 2006
- Record last updated
- Apr 24, 2023
- Medicaid ID
- 3091112 MA
- Medicare enrollment
- Enrolled (PECOS I20050502000006); may accept Medicare assignment
- Medical or professional school
- George Washington University School Of Medicine, 1986
- Entity
- Type 1 · individual
8 nearest medical oncology physician records → All 421 in Massachusetts → Look up another NPI →
Also registered at 535 Faunce Corner RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Erica Ahaesy, FNPFamily Nurse Practitioner1568891620
- Debby Almeida, MDFamily Medicine Physician1134289127
- Jean AmorePhysician Assistant1932082963
- Sharon Anderson, M.S., CCC-AAudiologist1083864110
- Luiza Arbain, PHARMD.Pharmacist1245232099
- Selina AvelinoAdult Health Nurse Practitioner1831839059
Verify John Niedzwicki in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 74834Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
8% fewer Medicare Part D claims than the average medical oncology physician in 2024
644 Medicare Part D claims for 132 beneficiaries, against an average of 703 among the 4,230 providers of this specialty who prescribed in Part D.
Most prescribed
- Hydroxyurea143 claims
- Tamoxifen Citrate60 claims
- Raloxifene Hcl55 claims
- Anastrozole51 claims
- Letrozole41 claims
- Imbruvica34 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: $41.81
2 payments; by number, the most common kind was food and beverage; the largest payer was GlaxoSmithKline, LLC. The 3,343 providers of this specialty with any payment received $11,773.47 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 one group practice
- Lifespan Physician Group OF Massachusetts IncDartmouth, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Niedzwicki among 421 medical oncology physician records in Massachusetts
John Niedzwicki, M.D. is one of 421 medical oncology physician records with a practice address in Massachusetts. 76% 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 10% of them.
- NPI issued2006 · 10% of these records are older, 60% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated1986 · median 2007 among the 291 with a school on file
- Record last updated2023 · 51% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RX0202X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Medical Oncology Physician providers in Massachusetts
There are 421 medical oncology physician records in Massachusetts.
All 421 in Massachusetts → Every provider in Dartmouth → Medical Oncology Physician nationwide →
The 8 medical oncology physician records with the nearest ZIP codes
- Diane PaggioliFall River, MA 027211487871927
- Robert McNamee, M.D.Taunton, MA 027801033190343
- Kenneth Bishop, MDAttleboro, MA 027031598925091
- Asma Latif, M.D.Attleboro, MA 027031013133560
- K. Robert McIntire, M.D.Mashpee, MA 026491417078569
- Qiang Nai, MDHarwich, MA 026451194105312
- Monica Smith, MDHarwich, MA 026451558309336
- Henry Casey, MDHyannis, MA 026011881662468
Common questions
What is John Niedzwicki, M.D.'s NPI number?
John Niedzwicki, M.D.'s National Provider Identifier (NPI) is 1306812367, issued on Feb 28, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Niedzwicki, M.D. located?
The NPPES record lists a practice address at 535 Faunce Corner RD, Dartmouth, MA, 02747. Phone: (508) 996-3991. Providers update this record themselves, so call before visiting.
How can I verify John Niedzwicki, M.D.'s license?
NPPES lists Massachusetts license number 74834, 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 John Niedzwicki, M.D. prescribe under Medicare Part D?
In 2024, John Niedzwicki, M.D. had 644 Medicare Part D claims for 132 beneficiaries; the average among medical oncology physician prescribers was 703. 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.