Louis Ostrowsky
Psychiatry Physician · Cambridge, MA
Louis Ostrowsky is a psychiatry physician with a practice address in Cambridge, Massachusetts, and NPI 1306135082, issued on Apr 1, 2011. Check the license (Massachusetts 257561, as entered in NPPES) on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Louis Ostrowsky
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- 257561 MA
Self-reported in NPPES; status is on the state search - Practice location
- 1493 Cambridge St, Cambridge, MA 02139
- Phone
- (617) 665-1187
- Enumerated
- Apr 1, 2011
- Record last updated
- Oct 16, 2015 (not updated in 11 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20151118002048); accepts Medicare assignment
- Medical or professional school
- Northwestern University Feinberg Medical School, 2011
- 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 Louis Ostrowsky in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in Medicine
Search for license 257561Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The practice group's MIPS final score for 2023 (Medicare payment program): 86.3 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Cambridge Public Health CommissionEverett, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Louis Ostrowsky among 2,736 psychiatry physician records in Massachusetts
Louis Ostrowsky 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 2011, is newer than 70% of them.
- NPI issued2011 · 70% of these records are older, 28% newer
- In a Medicare fileYes · 65% of these records are
- In the CMS Doctors and Clinicians fileYes · 45% of these records are
- Graduated2011 · median 2005 among the 1,219 with a school on file
- Record last updated2015 · 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 Louis Ostrowsky's NPI number?
Louis Ostrowsky's National Provider Identifier (NPI) is 1306135082, issued on Apr 1, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Louis Ostrowsky located?
The NPPES record lists a practice address at 1493 Cambridge St, Cambridge, MA, 02139. Phone: (617) 665-1187. Providers update this record themselves, so call before visiting.
How can I verify Louis Ostrowsky's license?
NPPES lists Massachusetts license number 257561, 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.
What is Louis Ostrowsky's MIPS final score?
The 2023 MIPS final score is 86.3 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.