NPIMap

Individual provider Active NPI

David K. Hahn, MD

  • Neurology Physician
  • Greenwich, CT
National Provider Identifier
1053625459
Registry record updated Oct 28, 2025
On this page

Key facts

NPPES NPI Registry
Primary specialty
Neurology PhysicianTaxonomy code 2084N0400X
License
ME134710 Issued in FL
Practice address
115 Mason St Ste 1
Greenwich, CT 06830-6630
Phone
(203) 276-4464
Fax
(203) 276-4468
NPI assigned
Jul 28, 2010
Last updated
Oct 28, 2025By the provider in NPPES
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Oct 28, 2025

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

Specialties & licenses 4

Specialty (taxonomy)CodeLicenseStatePrimary
Neurology Physician 2084N0400X 54629 CT
Neurology Physician 2084N0400X 4301114366 MI
Neurology Physician 2084N0400X ME134710 FL Primary
Neurology Physician 2084N0400X 19408 NH

Addresses

Primary practice location

115 Mason St Ste 1
Greenwich, CT 06830-6630

Mailing address

115 Mason St Ste 1
Greenwich, CT 06830-6630
Phone (718) 514-0224

Other identifiers 1

IdentifierTypeStateIssuer
3118697MedicaidNH

Medicare participation

Medicare enrollment files
Medicare fee-for-service enrollment
Enrolled in CT, NY2 enrollments
Eligible to order & refer
  • Part B services
  • Medical equipment
  • Home health
  • Power mobility devices
  • Hospice
Green means eligible to order or refer.

Enrollment records 2

Enrollment IDStateProvider typePAC IDDetails
I20151106001648 CT Practitioner - Neurology 7911217724 Reassigns benefits to 7 organizations
I20170615000578 NY Practitioner - Neurology 7911217724 Reassigns benefits to 3 organizations

Care Compare profile

Medicare Care Compare
Specialty
Neurology
Education
Warren Alpert Medical School of Brown University, 2008
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
Nuvance Health Medical Practice CT IncGroup PAC ID 4789597691, 742 clinicians
East Post Road Medical Services PCGroup PAC ID 6406198506, 419 clinicians
Midstate Medical CenterGroup PAC ID 7416840699, 187 clinicians

Practice addresses (Care Compare)

100 Grand St
New Britain, CT 06052-2016
Phone (860) 224-5011

24 Stevens St
Norwalk, CT 06850-3852
Phone (203) 852-2000

41 E Post Rd
White Plains, NY 10601-4607
Phone (914) 681-0600

435 Lewis Ave
Meriden, CT 06451-2101
Phone (203) 238-7747

Hospital & facility affiliations

National Provider Directory

National Provider Directory
Medicare enrollment (NPD)
Enrolled
Credentials
Doctor of Medicine

State licenses

LicenseStateTypeSpecialty
54629CTMDNeurology Physician
19408NHMDNeurology Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Northeast Medical Group, Inc. CurrentSince Sep 1, 2020 Accepting new patients
The Hospital of Central Connecticut at New Britain General and Bradley CurrentSince Feb 1, 2024 Accepting new patients
Midstate Medical Center Current Accepting new patients
Mason Street Industries LLC Neurology CurrentSince Oct 1, 2025 Accepting new patients
Midstate Medical Center CurrentSince Feb 1, 2024 Accepting new patients
Midstate Medical Center CurrentSince Feb 1, 2024 Accepting new patients
Norwalk Hospital Association CurrentSince Oct 1, 2020 Accepting new patients
The Charlotte Hungerford Hospital Neurology CurrentSince Jul 1, 2023 Accepting new patients
The Charlotte Hungerford Hospital CurrentSince Jul 1, 2023 Accepting new patients
The Brookdale Hospital Medical Center CurrentSince Jan 27, 2021 Accepting new patients
Norwalk Hospital Association CurrentSince Oct 1, 2020 Accepting new patients
Wyckoff Professional Medical Services, PC CurrentSince May 6, 2017 Accepting new patients
Brookdale Hospital Medical Center CurrentSince Jan 27, 2021 Accepting new patients
East Post Road Medical Services PC Neurology CurrentSince Mar 2, 2026 Accepting new patients
The Hospital of Central Connecticut at New Britain General and Bradley CurrentSince Feb 1, 2024 Accepting new patients
Stamford Neurological Associates PC PastSince Nov 1, 2015 Accepting new patients
Lima Memorial Joint Operating Company Past Accepting new patients

Locations

267 Grant St
Bridgeport, CT 06610
Phone (203) 384-3170

24 Hospital Ave
Danbury, CT 06810
Phone (203) 739-7118

115 Mason St
Ste 1
Greenwich, CT 06830
Phone (203) 997-7558

435 Lewis Ave
Meriden, CT 06451
Phone (203) 284-1340

100 Grand St
New Britain, CT 06052
Phone (860) 224-5011

520 West Ave
Norwalk, CT 06850
Phone (203) 852-2417

95 Armory Rd
Stratford, CT 06614
Phone (203) 384-3388

540 Litchfield St
Torrington, CT 06790
Phone (860) 496-6361

1 Brookdale Plz
Brooklyn, NY 11212
Phone (718) 240-5212

1235 Linden Blvd
Fl 2
Brooklyn, NY 11212
Phone (718) 240-7143

374 Stockholm St
Brooklyn, NY 11237
Phone (718) 963-6485

41 E Post Rd
White Plains, NY 10601
Phone (914) 681-1201

Networks

  • Optimum HealthCare HMO Network
  • Freedom Health HMO Network

Interoperability endpoints

  • Direct secure messaging: ms_dhahn11@landmarkhealth-direct.org

Organizations & group practices 18

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.

View all 18

Hospital & facility affiliations 9

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

NPI Registry JSON

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

{
    "created_epoch": "1280275200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1761609600000",
    "number": "1053625459",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "115 MASON ST STE 1",
            "city": "GREENWICH",
            "state": "CT",
            "postal_code": "068306630",
            "telephone_number": "718-514-0224"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "115 MASON ST STE 1",
            "city": "GREENWICH",
            "state": "CT",
            "postal_code": "068306630",
            "telephone_number": "203-276-4464",
            "fax_number": "203-276-4468"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "HAHN",
        "first_name": "DAVID",
        "middle_name": "K.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2010-07-28",
        "last_updated": "2025-10-28",
        "certification_date": "2025-10-28",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "2084N0400X",
            "taxonomy_group": "",
            "desc": "Psychiatry & Neurology, Neurology",
            "state": "CT",
            "license": "54629",
            "primary": false
        },
        {
            "code": "2084N0400X",
            "taxonomy_group": "",
            "desc": "Psychiatry & Neurology, Neurology",
            "state": "MI",
            "license": "4301114366",
            "primary": false
        },
        {
            "code": "2084N0400X",
            "taxonomy_group": "",
            "desc": "Psychiatry & Neurology, Neurology",
            "state": "FL",
            "license": "ME134710",
            "primary": true
        },
        {
            "code": "2084N0400X",
            "taxonomy_group": "",
            "desc": "Psychiatry & Neurology, Neurology",
            "state": "NH",
            "license": "19408",
            "primary": false
        }
    ],
    "identifiers": [
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "3118697",
            "state": "NH"
        }
    ],
    "endpoints": [],
    "other_names": []
}

Other providers in Greenwich, CT

Sources for this page

Verify at the official NPI Registry.