Alexander Gregers Posell, MD
Psychiatry Physician · Brooklyn, NY
Alexander Gregers Posell, MD is a psychiatry physician with a practice address in Brooklyn, New York, and NPI 1598384315, issued on Apr 11, 2020. Check the license (New York 319892, as entered in NPPES) on the NYS Education Department, Office of the Professions; the Medicare figures below come from public CMS files.
- Name
- Alexander Gregers Posell
- Credential
- MD
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- 319892 NY
Self-reported in NPPES; status is on the state search - Practice location
- 189 S 9TH St Apt 20, Brooklyn, NY 11211
- Phone
- (213) 393-3711
- Enumerated
- Apr 11, 2020
- Record last updated
- Dec 11, 2025
- Medicaid ID
- 07808491 NY
- Medicare enrollment
- Enrolled (PECOS I20231004001276); accepts Medicare assignment
- Medical or professional school
- University Of Southern California Keck School Of Medicine, 2020
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 6,589 in New York → Look up another NPI →
Verify Alexander Gregers Posell in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNYS Education Department, Office of the Professions
Search for license 319892Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
72% fewer Medicare Part D claims than the average psychiatry physician in 2024
276 Medicare Part D claims for 14 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D.
Most prescribed
- Benztropine Mesylate26 claims
- Divalproex Sodium Er26 claims
- Clozapine22 claims
- Sertraline Hcl18 claims
- Hydroxyzine Hcl15 claims
- Risperidone15 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.
Bills Medicare through 2 group practices
- North Shore-Lij Medical PCNew York, NY
- Pesach Tikvah Hope Development IncBrooklyn, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Alexander Gregers Posell among 6,589 psychiatry physician records in New York
Alexander Gregers Posell, MD is one of 6,589 psychiatry physician records with a practice address in New York. 72% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 91% of them.
- NPI issued2020 · 91% of these records are older, 6% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileYes · 39% of these records are
- Graduated2020 · median 2002 among the 2,559 with a school on file
- Record last updated2025 · 65% 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 New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
559 psychiatry physician records list a practice address in Brooklyn
They are 559 of the 64,057 NPPES records with a practice address in Brooklyn, and 6,589 psychiatry physician records in New York.
All 6,589 in New York → Every provider in Brooklyn → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Jeffrey Bouchard-Burns, MDBrooklyn, NY 112111326068537
- Nahil Chohan, M.D.Brooklyn, NY 112111205179074
- Chi Ping Chu, M.D.Brooklyn, NY 112111346265634
- Nicole Hays, DOBrooklyn, NY 112111164982021
- Rodolfo Sandin, MDBrooklyn, NY 112111891865184
- Kelly Taylor, M.D.Brooklyn, NY 112111275952723
- Eric Yarbrough, M.D.Brooklyn, NY 112111881860930
- Miriam Zincke, MPH MDBrooklyn, NY 112111841468337
Common questions
What is Alexander Gregers Posell, MD's NPI number?
Alexander Gregers Posell, MD's National Provider Identifier (NPI) is 1598384315, issued on Apr 11, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Alexander Gregers Posell, MD located?
The NPPES record lists a practice address at 189 S 9TH St Apt 20, Brooklyn, NY, 11211. Phone: (213) 393-3711. Providers update this record themselves, so call before visiting.
How can I verify Alexander Gregers Posell, MD's license?
NPPES lists New York license number 319892, as entered by the provider. Search the NYS Education Department, Office of the Professions at https://www.op.nysed.gov/services/verifications/online-verification-searches. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Alexander Gregers Posell, MD prescribe under Medicare Part D?
In 2024, Alexander Gregers Posell, MD had 276 Medicare Part D claims for 14 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.