Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Dr. Alexander Gregers Posell, MD

Individual provider Psychiatry Physician · NPI 1598384315

Dr. Alexander Gregers Posell, MD is a Psychiatry in Brooklyn, New York. Graduated from University of Southern California Keck School of Medicine in 2020, 6 years ago. Practices with North Shore-Lij Medical PC, a 6,350-clinician group, works from 2 locations and accepts Medicare assignment. Licensed in New York.

Years since qualifying
6
Trained at
University of Southern California Keck School of Medicine
Licensed in
NY
In the registry since
2020
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

189 S 9th St Apt 20
Brooklyn, NY 11211-6159
Phone: (213) 393-3711
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 303 5th Ave, New York, NY 10016-6601 — (646) 397-3017

Specialties & licences

Psychiatry Physician (primary) Taxonomy 2084P0800X · Licence 319892 (NY)
Forensic Psychiatry Physician Taxonomy 2084F0202X · Licence 319892 (NY)

Record details

NPI number1598384315
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedApril 11, 2020
Last updated in NPPESDecember 11, 2025
Certification dateDecember 11, 2025

Medicare enrollment

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

Medicare specialtyPSYCHIATRY
Medical schoolUNIVERSITY OF SOUTHERN CALIFORNIA KECK SCHOOL OF MEDICINE
Graduated 2020 (6 years in practice)
Group practice North Shore-Lij Medical Pc — 6350 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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