Karen S. Greenberg, M.D.
Psychiatry Physician · Brookline, MA
Karen S. Greenberg, M.D. is a psychiatry physician with a practice address in Brookline, Massachusetts, and NPI 1942315098, issued on Aug 20, 2006. Check the license (Massachusetts 155739, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Karen S. Greenberg
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- 155739 MA
Self-reported in NPPES; status is on the state search - Practice location
- 23 Sumner RD Apt 1, Brookline, MA 02445
- Phone
- (617) 733-4755
- Enumerated
- Aug 20, 2006
- Record last updated
- Mar 19, 2024
- Fax
- (617) 566-4633
- Medicare enrollment
- Enrolled (PECOS I20090204000540); accepts Medicare assignment
- Medical or professional school
- Boston University School Of Medicine, 1995
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 2,736 in Massachusetts → Look up another NPI →
Verify Karen S. Greenberg in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 155739Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
80% fewer Medicare Part D claims than the average psychiatry physician in 2024
202 Medicare Part D claims for 11 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims.
Most prescribed
- Bupropion Xl17 claims
- Escitalopram Oxalate13 claims
- Trintellix13 claims
- Alprazolam12 claims
- Invega Sustenna12 claims
- Modafinil11 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 S. Greenberg among 2,736 psychiatry physician records in Massachusetts
Karen S. Greenberg, M.D. is one of 2,736 psychiatry physician records with a practice address in Massachusetts. 65% 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, 51% newer
- In a Medicare fileYes · 65% of these records are
- In the CMS Doctors and Clinicians fileYes · 45% of these records are
- Graduated1995 · median 2005 among the 1,219 with a school on file
- Record last updated2024 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
117 psychiatry physician records list a practice address in Brookline
They are 117 of the 2,357 NPPES records with a practice address in Brookline, and 2,736 psychiatry physician records in Massachusetts.
All 2,736 in Massachusetts → Every provider in Brookline → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Michele Baker, M.D.Brookline, MA 024451871544379
- Ellen Blumenthal, MDBrookline, MA 024451770552861
- Ethel Bullitt, M.D.Brookline, MA 024451700833183
- Eugene Cacciola, M.D.Brookline, MA 024451881682466
- Eugene Fierman, M.D.Brookline, MA 024451366429839
- Linda Gross, M.D.Brookline, MA 024451588603674
- Hilary Hoge, M.D.Brookline, MA 024451023000841
- Jonathan Kolb, MDBrookline, MA 024451821088394
Common questions
What is Karen S. Greenberg, M.D.'s NPI number?
Karen S. Greenberg, M.D.'s National Provider Identifier (NPI) is 1942315098, issued on Aug 20, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Karen S. Greenberg, M.D. located?
The NPPES record lists a practice address at 23 Sumner RD Apt 1, Brookline, MA, 02445. Phone: (617) 733-4755. Providers update this record themselves, so call before visiting.
How can I verify Karen S. Greenberg, M.D.'s license?
NPPES lists Massachusetts license number 155739, 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 S. Greenberg, M.D. prescribe under Medicare Part D?
In 2024, Karen S. Greenberg, M.D. had 202 Medicare Part D claims for 11 beneficiaries; the average among psychiatry physician prescribers was 1,000. 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.