Marshall Forstein, MD
Psychiatry Physician · Cambridge, MA
Marshall Forstein, MD is a psychiatry physician with a practice address in Cambridge, Massachusetts, and NPI 1063555423, issued on Feb 15, 2007. Check the license (Massachusetts 49162, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Marshall Forstein
- Credential
- MD
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- 49162 MA
Self-reported in NPPES; status is on the state search - Practice location
- 1493 Cambridge St, Cambridge, MA 02139
- Phone
- (617) 665-1189
- Enumerated
- Feb 15, 2007
- Record last updated
- Feb 14, 2012 (not updated in 14 years: call before relying on the address or phone)
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 2,736 in Massachusetts → Look up another NPI →
Also registered at 1493 Cambridge St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Marshall Forstein in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 49162Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average psychiatry physician in 2024
33 Medicare Part D claims, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.
Most prescribed
- Clonazepam12 claims
- Methylphenidate Er12 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.
Marshall Forstein among 2,736 psychiatry physician records in Massachusetts
Marshall Forstein, MD 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 2007, is newer than 49% of them.
- NPI issued2007 · 49% of these records are older, 37% newer
- In a Medicare fileYes · 65% of these records are
- In the CMS Doctors and Clinicians fileNo · 45% of these records are
- Record last updated2012 · 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).
213 psychiatry physician records list a practice address in Cambridge
They are 213 of the 5,145 NPPES records with a practice address in Cambridge, and 2,736 psychiatry physician records in Massachusetts.
All 2,736 in Massachusetts → Every provider in Cambridge → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Sanda Aung, MDCambridge, MA 021391679564108
- Sherry Bauman, MDCambridge, MA 021391023082708
- Wayne Brunell, MDCambridge, MA 021391740282094
- Astrid Desrosiers, MD MPHCambridge, MA 021391033109582
- Lili Gottfried, MDCambridge, MA 021391215902390
- Sanjay Gulati, MDCambridge, MA 021391316910094
- Joseph Jackson, D.O.Cambridge, MA 021391609847631
- Michael Leslie, M.D.Cambridge, MA 021391851367395
Common questions
What is Marshall Forstein, MD's NPI number?
Marshall Forstein, MD's National Provider Identifier (NPI) is 1063555423, issued on Feb 15, 2007. An NPI identifies a provider in billing; it is not a license.
Where is Marshall Forstein, MD located?
The NPPES record lists a practice address at 1493 Cambridge St, Cambridge, MA, 02139. Phone: (617) 665-1189. Providers update this record themselves, so call before visiting.
How can I verify Marshall Forstein, MD's license?
NPPES lists Massachusetts license number 49162, 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 Marshall Forstein, MD prescribe under Medicare Part D?
In 2024, Marshall Forstein, MD had 33 Medicare Part D claims; 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.