Alexander Gregers Posell, MD

Primary specialty

Psychiatry PhysicianTaxonomy code 2084P0800X

License

319892 Issued in NY

Practice address

189 S 9TH St Apt 20
Brooklyn, NY 11211-6159

Phone

(213) 393-3711

NPI assigned

Apr 11, 2020

Last updated

Dec 11, 2025By the provider in NPPES

Sex

Male

Sole proprietor

No

Registry information is reported by the provider to CMS and is not verified. About this source

Specialties & licenses 2

Addresses

Other identifiers 1

Medicare fee-for-service enrollment

Enrolled in NY

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Psychiatry

Education

University of Southern California Keck School of Medicine, 2020

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Group practices

North Shore-Lij Medical PCGroup PAC ID 3375701568, 6,374 clinicians

Pesach Tikvah Hope Development IncGroup PAC ID 2163311564, 44 clinicians

Practice addresses (Care Compare)

Merit-based Incentive Payment System (MIPS)

Final score

93.07 of 100Reported as apm

Quality

79.77

Promoting interoperability

88.77

Improvement activities

40

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

Practice roles

Locations

Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships, National Provider Directory roles and organizations whose NPPES authorized official is this provider.

• North Shore-Lij Medical PC

  dba NHPP Cardiology at Great Neck

  • Urology Physician
  • Great Neck, NY
  • NPI 1053688572
  Medicare reassignment Care Compare group NPD
• Pesach Tikvah Hope Development Inc

  • Mental Health Counselor
  • Brooklyn, NY
  • NPI 1376598466
  Medicare reassignment Care Compare group NPD
• North Shore - Lij Medical PC

  dba NSLIJ Medical In Queens

  • Internal Medicine Physician
  • New Hyde Park, NY
  • NPI 1790043479
  NPD
• Pesach Tikvah Hope Development Inc

  dba Pesach Tikvah

  • Mental Health Clinic/Center (Including Community Mental Health Center)
  • Brooklyn, NY
  • NPI 1740834191
  NPD

The complete NPPES record for this NPI in the NPI Registry API format.

{
    "created_epoch": "1586563200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1765411200000",
    "number": "1598384315",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "189 S 9TH ST APT 20",
            "city": "BROOKLYN",
            "state": "NY",
            "postal_code": "112116159",
            "telephone_number": "646-397-3017",
            "fax_number": "646-585-4389"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "189 S 9TH ST APT 20",
            "city": "BROOKLYN",
            "state": "NY",
            "postal_code": "112116159",
            "telephone_number": "213-393-3711"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "303 5th Ave",
            "address_purpose": "LOCATION",
            "city": "New York",
            "state": "NY",
            "postal_code": "100166601",
            "country_code": "US",
            "telephone_number": "646-397-3017",
            "fax_number": "646-585-4389",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "POSELL",
        "first_name": "ALEXANDER",
        "middle_name": "GREGERS",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2020-04-11",
        "last_updated": "2025-12-11",
        "certification_date": "2025-12-11",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2084F0202X",
            "taxonomy_group": "",
            "desc": "Psychiatry & Neurology, Forensic Psychiatry",
            "state": "NY",
            "license": "319892",
            "primary": false
        },
        {
            "code": "2084P0800X",
            "taxonomy_group": "",
            "desc": "Psychiatry & Neurology, Psychiatry",
            "state": "NY",
            "license": "319892",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "07808491",
            "state": "NY"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Hadassa Portowicz
• Alina Portugal, M.S., CCC-SLP, TSSLD
• Mindy Portugal
• Thomas Porturas, MD, PHD
• Brandee Portwood
• Esther Posen
• Gittel Posen
• Shira Posen
• Lateesa Thamani Posey, APRN
• Olga Positko, RN

• Psychiatry Physician in Brooklyn, NY
• Providers in Brooklyn, NY by specialty
• Psychiatry Physician in New York

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Dec 11, 2025; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.