Karen Esther Victor, M.D.
Internal Medicine Physician · Cambridge, MA
Karen Esther Victor, M.D. is an internal medicine physician with a practice address in Cambridge, Massachusetts, and NPI 1669505269, issued on Mar 13, 2007. Check the license (Massachusetts 56133, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Karen Esther Victor
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 56133 MA
Self-reported in NPPES; status is on the state search - Practice location
- 725 Concord Ave Ste 2000, Cambridge, MA 02138
- Phone
- (617) 661-4600
- Enumerated
- Mar 13, 2007
- Record last updated
- Mar 7, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (617) 547-9170
- Medicaid ID
- 3125823 MA
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 6,825 in Massachusetts → Look up another NPI →
Also registered at 725 Concord Ave Ste 2000
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jacquelyn Perna, DOFamily Medicine Physician1013011980
Verify Karen Esther Victor in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 56133Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
45% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,737 Medicare Part D claims for 217 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 16 claims were for opioids.
Most prescribed
- Atorvastatin Calcium247 claims
- Lisinopril98 claims
- Metoprolol Succinate83 claims
- Levothyroxine Sodium72 claims
- Amlodipine Besylate63 claims
- Losartan Potassium62 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.
Karen Esther Victor among 6,825 internal medicine physician records in Massachusetts
Karen Esther Victor, M.D. is one of 6,825 internal medicine physician records with a practice address in Massachusetts. 75% 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 46% of them.
- NPI issued2007 · 46% of these records are older, 45% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileNo · 60% of these records are
- Record last updated2019 · 64% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
300 internal medicine physician records list a practice address in Cambridge
They are 300 of the 5,145 NPPES records with a practice address in Cambridge, and 6,825 internal medicine physician records in Massachusetts.
All 6,825 in Massachusetts → Every provider in Cambridge → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Susan Abookire, MDCambridge, MA 021381407859762
- Matthew Carmody, MDCambridge, MA 021381184624488
- Mark Friedman, MDCambridge, MA 021381760482921
- Eva Gassiraro, MDCambridge, MA 021381598762833
- Beth Goldman, MDCambridge, MA 021381457358798
- Charles Hatem, MDCambridge, MA 021381528065877
- David Hudacek, MDCambridge, MA 021381992707269
- Janine McCauley, MDCambridge, MA 021381487656617
Common questions
What is Karen Esther Victor, M.D.'s NPI number?
Karen Esther Victor, M.D.'s National Provider Identifier (NPI) is 1669505269, issued on Mar 13, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Karen Esther Victor, M.D. located?
The NPPES record lists a practice address at 725 Concord Ave Ste 2000, Cambridge, MA, 02138. Phone: (617) 661-4600. Providers update this record themselves, so call before visiting.
How can I verify Karen Esther Victor, M.D.'s license?
NPPES lists Massachusetts license number 56133, 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 Karen Esther Victor, M.D. prescribe under Medicare Part D?
In 2024, Karen Esther Victor, M.D. had 1,737 Medicare Part D claims for 217 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.