Gretchen Ann Gignac, MD
Medical Oncology Physician · Boston, MA
Gretchen Ann Gignac, MD is a medical oncology physician with a practice address in Boston, Massachusetts, and NPI 1821288960, issued on Jul 25, 2007. Check the license (Massachusetts 232079, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Gretchen Ann Gignac
- Credential
- MD
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License number
- 232079 MA
Self-reported in NPPES; status is on the state search - Practice location
- 830 Harrison Avenue, Boston, MA 02118
- Phone
- (617) 638-6428
- Enumerated
- Jul 25, 2007
- Record last updated
- Jun 5, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (617) 638-5756
- Medicaid ID
- 110077244A MA
- Medicare enrollment
- Enrolled (PECOS I20070919000312); accepts Medicare assignment
- Medical or professional school
- Perelman School Of Med At The University Of Pennsylvania, 2001
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest medical oncology physician records → All 421 in Massachusetts → Look up another NPI →
Also registered at 830 Harrison Avenue
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Nana Addo-Tabiri, MDMedical Oncology Physician1942557079
- Charles Bliss, MDGastroenterology Physician1740266477
- Margaret Brown, AUDAudiologist1043104953
- Kelsey Burke, PA-CPhysician Assistant1629569702
- Lizabeth Cline, N.P.Adult Health Nurse Practitioner1710092929
- Arthur Cohn, MDOtolaryngology Physician1467438861
Verify Gretchen Ann Gignac in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 232079Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
7% more Medicare Part D claims than the average medical oncology physician in 2024
753 Medicare Part D claims for 117 beneficiaries, against an average of 703 among the 4,230 providers of this specialty who prescribed in Part D. Brand-name drugs were 63% of claims. 21 claims were for opioids.
Most prescribed
- Orgovyx294 claims
- Nubeqa94 claims
- Prednisone60 claims
- Abiraterone Acetate57 claims
- Bicalutamide53 claims
- Xtandi32 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
- Evans Medical Foundation IncBoston, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gretchen Ann Gignac among 421 medical oncology physician records in Massachusetts
Gretchen Ann Gignac, MD 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 2007, is newer than 40% of them.
- NPI issued2007 · 40% of these records are older, 49% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2001 · median 2007 among the 291 with a school on file
- Record last updated2014 · 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 Boston → Medical Oncology Physician nationwide →
The 8 medical oncology physician records with the nearest ZIP codes
- Adeboye Adewoye, M.D.Boston, MA 021181316920838
- Karen Antman, M.D.Boston, MA 021181528195401
- Marjory Charlot, M.D.Boston, MA 021181871609644
- Peter Everett, M.D.Boston, MA 021181144495375
- Amy Fallon, MDBoston, MA 021181346223450
- Kevan Hartshorn, M.D.Boston, MA 021181700862745
- Naomi Ko, M.D.Boston, MA 021181043360928
- Adam Lerner, M.D.Boston, MA 021181063460087
Common questions
What is Gretchen Ann Gignac, MD's NPI number?
Gretchen Ann Gignac, MD's National Provider Identifier (NPI) is 1821288960, issued on Jul 25, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Gretchen Ann Gignac, MD located?
The NPPES record lists a practice address at 830 Harrison Avenue, Boston, MA, 02118. Phone: (617) 638-6428. Providers update this record themselves, so call before visiting.
How can I verify Gretchen Ann Gignac, MD's license?
NPPES lists Massachusetts license number 232079, 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 Gretchen Ann Gignac, MD prescribe under Medicare Part D?
In 2024, Gretchen Ann Gignac, MD had 753 Medicare Part D claims for 117 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.