Charles Rosenbaum, M.D.
Medical Oncology Physician · Marlborough, MA
Charles Rosenbaum, M.D. is a medical oncology physician with a practice address in Marlborough, Massachusetts, and NPI 1922049147, issued on Jun 9, 2006. Check the license (Massachusetts 36848, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Charles Rosenbaum
- Credential
- M.D.
- Primary taxonomy
- Medical Oncology Physician 207RX0202X
- License number
- 36848 MA
Self-reported in NPPES; status is on the state search - Practice location
- 65 Fremont St, Marlborough, MA 01752
- Phone
- (508) 481-4213
- Enumerated
- Jun 9, 2006
- Record last updated
- Jul 9, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (508) 481-7841
- Medicaid ID
- 2074303 MA
- Entity
- Type 1 · individual
8 nearest medical oncology physician records → All 421 in Massachusetts → Look up another NPI →
Also registered at 65 Fremont St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Charles Rosenbaum in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 36848Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average medical oncology physician in 2024
69 Medicare Part D claims for 12 beneficiaries, against an average of 703 among the 4,230 providers of this specialty who prescribed in Part D.
Most prescribed
- Quetiapine Fumarate13 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.
Charles Rosenbaum among 421 medical oncology physician records in Massachusetts
Charles Rosenbaum, 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 fileNo · 69% of these records are
- Record last updated2007 · 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 Marlborough → Medical Oncology Physician nationwide →
The 8 medical oncology physician records with the nearest ZIP codes
- Daniel Fein, M.D.Milford, MA 017571053791707
- Alexei Shimanovsky, M.D.,Milford, MA 017571699054924
- Timothy Ernst, M.D.Natick, MA 017601972542975
- Kimberly Brennan, D.O.Concord, MA 017421487838744
- William Slichenmyer, M.D.Sherborn, MA 017701962773424
- John Krikorian, M.D.Framingham, MA 017021104851286
- Jack Leitner, MDFramingham, MA 017021205975067
- Vivek Samnotra, MDFramingham, MA 017021285665935
Common questions
What is Charles Rosenbaum, M.D.'s NPI number?
Charles Rosenbaum, M.D.'s National Provider Identifier (NPI) is 1922049147, issued on Jun 9, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Charles Rosenbaum, M.D. located?
The NPPES record lists a practice address at 65 Fremont St, Marlborough, MA, 01752. Phone: (508) 481-4213. Providers update this record themselves, so call before visiting.
How can I verify Charles Rosenbaum, M.D.'s license?
NPPES lists Massachusetts license number 36848, 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 Charles Rosenbaum, M.D. prescribe under Medicare Part D?
In 2024, Charles Rosenbaum, M.D. had 69 Medicare Part D claims for 12 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.