Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.

Louis Ostrowsky

Individual provider Student in an Organized Health Care Education/Training Program · NPI 1306135082

Louis Ostrowsky practises Psychiatry in Cambridge, Massachusetts. Graduated from Northwestern University Feinberg Medical School in 2011, 15 years ago. Practices with Cambridge Public Health Commission, a 649-clinician group and accepts Medicare assignment. Licensed in Massachusetts.

Years since qualifying
15
Trained at
Northwestern University Feinberg Medical School
Licensed in
MA
In the registry since
2011
Specialties on file
2

Practice location Address checks out

Student / training record This NPI belongs to someone enrolled in a health care training programme. It carries no licence and no practice of its own, so no address or phone number is published for it.

Cambridge, MA

Specialties & licences

Psychiatry Physician (primary) Taxonomy 2084P0800X · Licence 257561 (MA)
Student in an Organized Health Care Education/Training Program Taxonomy 390200000X

Record details

NPI number1306135082
Entity typeIndividual (Type 1)
GenderMale
Sole proprietorNo
NPI enumeratedApril 1, 2011
Last updated in NPPESOctober 16, 2015

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyPSYCHIATRY
Medical schoolNORTHWESTERN UNIVERSITY FEINBERG MEDICAL SCHOOL
Graduated 2011 (15 years in practice)
Group practice Cambridge Public Health Commission — 649 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients14
Services billed 36 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Colleagues at Cambridge Public Health Commission

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 649 clinicians in the practice; 12 are shown here.

Other providers in Cambridge