NPIMap

Individual provider Active NPI

Nicholas Dainiak, M.D.

  • Internal Medicine Physician
  • Bridgeport, CT
National Provider Identifier
1396713467
Registry record updated Jul 13, 2026
On this page

Key facts

NPPES NPI Registry
Primary specialty
Internal Medicine PhysicianTaxonomy code 207R00000X
License
017830 Issued in CT
Practice address
226 Mill Hill Ave
3Rd Floor
Bridgeport, CT 06610-2811
Phone
(203) 384-3873
Fax
(203) 384-3829
NPI assigned
Mar 14, 2006
Sex
Male
Sole proprietor
No

NPPES NPI Registry

Updated by the provider on Jul 13, 2026

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

Specialties & licenses 2

Specialty (taxonomy)CodeLicenseStatePrimary
Internal Medicine Physician 207R00000X 017830 CT Primary
Hematology (Internal Medicine) Physician 207RH0000X 017830 CT

Addresses

Primary practice location

226 Mill Hill Ave
3Rd Floor
Bridgeport, CT 06610-2811

Mailing address

PO Box 5246
Bridgeport, CT 06610-0246
Phone (203) 384-3873

Medicare participation

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

Enrollment records 1

Enrollment IDStateProvider typePAC IDDetails
I20100504000862 CT Practitioner - Hematology 7214065762 Reassigns benefits to 5 organizations

Care Compare profile

Medicare Care Compare
Specialty
Hematology
Education
Loyola University of Chicago, Stritch School of Medicine, 1973
Medicare assignment
Accepts the Medicare-approved amount as payment in full
Group practices
Hartford HospitalGroup PAC ID 2567366016, shared by 6 NPIs, 1,040 clinicians

Practice addresses (Care Compare)

80 Seymour St
Hartford, CT 06102-8000

Hospital & facility affiliations

  • Hartford Hospital Hospital, Hartford, CT, CCN 070025

Merit-based Incentive Payment System (MIPS)

Final score
92.63 of 100Reported as group
Quality
75.35
Promoting interoperability
100
Improvement activities
40
Cost
71.44

National Provider Directory

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

State licenses

LicenseStateTypeSpecialty
017830CTMDInternal Medicine Physician

Practice roles

OrganizationSpecialtyStatusNew patients
Hartford Pathology Associates, P.C. Current Accepting new patients
The Hospital of Central Connecticut at New Britain General and Bradley CurrentSince Feb 1, 2021 Accepting new patients
Hartford Hospital Internal Medicine CurrentSince Dec 15, 2019 Accepting new patients
Hartford Hospital CurrentSince Dec 15, 2019 Accepting new patients
Windham Community Memorial Hospital, Inc. CurrentSince Feb 1, 2021 Accepting new patients
The Hospital of Central Connecticut at New Britain General and Bradley Internal Medicine CurrentSince Feb 1, 2021 Accepting new patients
William W Backus Hospital CurrentSince Feb 1, 2021 Accepting new patients
The William W Backus Hospital CurrentSince Feb 1, 2021 Accepting new patients

Locations

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

326 Washington St
Norwich, CT 06360
Phone (860) 701-0140

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

196 Parkway S
Ste 202
Waterford, CT 06385
Phone (860) 439-0440

112 Mansfield Ave
Willimantic, CT 06226
Phone (830) 423-6410

Interoperability endpoints

  • Direct secure messaging: nicholas.dainiak@xdr.hhchealthdirect.org

Organizations & group practices 8

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

Hospital & facility affiliations 2

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": "1142294400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1396713467",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 5246",
            "city": "BRIDGEPORT",
            "state": "CT",
            "postal_code": "066100246",
            "telephone_number": "203-384-3873",
            "fax_number": "203-384-3829"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "226 MILL HILL AVE",
            "address_2": "3RD FLOOR",
            "city": "BRIDGEPORT",
            "state": "CT",
            "postal_code": "066102811",
            "telephone_number": "203-384-3873",
            "fax_number": "203-384-3829"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "DAINIAK",
        "first_name": "NICHOLAS",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-03-14",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207R00000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine",
            "state": "CT",
            "license": "017830",
            "primary": true
        },
        {
            "code": "207RH0000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Hematology",
            "state": "CT",
            "license": "017830",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

Other providers in Bridgeport, CT

Sources for this page

Verify at the official NPI Registry.