Steven Isakoff, MD PHD
Hematology & Oncology Physician · Boston, MA
Steven Isakoff, MD PHD is a hematology & oncology physician with a practice address in Boston, Massachusetts, and NPI 1447205042, issued on May 23, 2006. Check the license (Massachusetts 218952, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Steven Isakoff
- Credential
- MD PHD
- Primary taxonomy
- Hematology & Oncology Physician 207RH0003X
- License number
- 218952 MA
Self-reported in NPPES; status is on the state search - Practice location
- 55 Fruit St, Boston, MA 02114
- Phone
- (617) 726-6500
- Enumerated
- May 23, 2006
- Entity
- Type 1 · individual
Also registered at 55 Fruit St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Affan Aamir, MD, PHARMD, RPHStudent in an Organized Health Care Education/Training Program1821890377
- Matthew AbadirAnesthesiology Physician1699120550
- Taimur AbbasiStudent in an Organized Health Care Education/Training Program1841673522
- Megan Abbott, MDAnesthesiology Physician1730839333
- Moustafa AbdallaStudent in an Organized Health Care Education/Training Program1952046062
- Shadi Abdar Esfahani, MD, MPHDiagnostic Radiology Physician1497137590
Verify Steven Isakoff in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 218952Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS, AOA, NCCPA, AANPNot checked
71% fewer Medicare Part D claims than the average hematology & oncology physician in 2024
254 Medicare Part D claims for 81 beneficiaries, against an average of 885 among the 8,428 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims.
Most prescribed
- Letrozole82 claims
- Tamoxifen Citrate28 claims
- Anastrozole21 claims
- Orserdu16 claims
- Prochlorperazine Maleate12 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.
2 hospital and facility affiliations
- Massachusetts General Physicians Organization IncBoston, MA
- The General Hospital CorporationBoston, MA
Source: CMS Doctors and Clinicians affiliations; Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
Hematology & Oncology Physician providers in Massachusetts
There are 385 hematology & oncology physician records in Massachusetts.
Other hematology & oncology physician records in Massachusetts
- Gregory Abel, MDBoston, MA1285611954
- Rachel Abelman, MDBoston, MA1255821617
- Karim Abou-Nassar, MDBoston, MA1366770745
- Inas Abuali, M.D.Boston, MA1952659971
- Maureen Achebe, MD, MPHBoston, MA1407955172
- Archana Agarwal, MDSpringfield, MA1548592165
- Rasmia Ahmed, MDFramingham, MA1568409936
- Hanny Al-Samkari, MDBoston, MA1669765988
- Syed Ali, MDSpringfield, MA1174751267
- Tasneem Ali, M.D.Worcester, MA1629036553
Common questions
What is Steven Isakoff, MD PHD's NPI number?
Steven Isakoff, MD PHD's National Provider Identifier (NPI) is 1447205042, issued on May 23, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Steven Isakoff, MD PHD located?
The NPPES record lists a practice address at 55 Fruit St, Boston, MA, 02114. Phone: (617) 726-6500. Providers update this record themselves, so call before visiting.
How can I verify Steven Isakoff, MD PHD's license?
NPPES lists Massachusetts license number 218952, as entered by the provider. Search the Massachusetts Board of Registration in Medicine at https://www.mass.gov/orgs/board-of-registration-in-medicine. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Steven Isakoff, MD PHD prescribe under Medicare Part D?
In 2024, Steven Isakoff, MD PHD had 254 Medicare Part D claims for 81 beneficiaries; the average among hematology & oncology physician prescribers was 885. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), loaded Aug 27, 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.
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 27, 2026.