Greg Gulbransen, DO

Primary specialty

Pediatrics PhysicianTaxonomy code 208000000X

License

205715-1 Issued in NY

Practice address

229 South St
Oyster Bay, NY 11771-2910

Phone

(516) 922-3131

Fax

(516) 922-5218

NPI assigned

Jul 8, 2005

Last updated

Jul 13, 2026By 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 1

Addresses

Other identifiers 10

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Not enrolled

Credentials

Doctor of Osteopathy

State licenses

Practice roles

Networks

• Healthfirst Medicare Network H5989
• Healthfirst Medicare Network H1722
• Healthfirst Medicare Network H9678
• Healthfirst Medicare Network H3359

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.

• Oyster Bay Pediatrics & Adolescent Medicine

  • Pediatric Adolescent Medicine Physician
  • Oyster Bay, NY
  • NPI 1740319334
  NPD (past) Authorized official

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

{
    "created_epoch": "1120780800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1073511622",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "229 SOUTH ST",
            "city": "OYSTER BAY",
            "state": "NY",
            "postal_code": "117712910",
            "telephone_number": "516-922-3131",
            "fax_number": "516-922-5218"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "229 SOUTH ST",
            "city": "OYSTER BAY",
            "state": "NY",
            "postal_code": "117712910",
            "telephone_number": "516-922-3131",
            "fax_number": "516-922-5218"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "GULBRANSEN",
        "first_name": "GREG",
        "name_prefix": "Dr.",
        "credential": "DO",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2005-07-08",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "208000000X",
            "taxonomy_group": "",
            "desc": "Pediatrics",
            "state": "NY",
            "license": "205715-1",
            "primary": true
        }
    ],
    "identifiers": [
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "AETNA",
            "identifier": "7734061",
            "state": "NY"
        },
        {
            "code": "05",
            "desc": "MEDICAID",
            "issuer": null,
            "identifier": "02232162",
            "state": "NY"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "PHCS",
            "identifier": "2C7659",
            "state": "NY"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "BLUE CROSS",
            "identifier": "OB203",
            "state": "NY"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "OXFORD",
            "identifier": "P2160711",
            "state": "NY"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "GHI",
            "identifier": "2698521",
            "state": "NY"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "SELECT PRO",
            "identifier": "NS0002187",
            "state": "NY"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "CIGNA",
            "identifier": "0099840-002",
            "state": "NY"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "VYTRA",
            "identifier": "108783",
            "state": "NY"
        },
        {
            "code": "01",
            "desc": "Other (non-Medicare)",
            "issuer": "UNITED HEALTH",
            "identifier": "1938888002",
            "state": "NY"
        }
    ],
    "endpoints": [],
    "other_names": []
}

• Theresa Greenfield, D.P.T.
• Dina Grgas, MS, RD, CDN
• Christopher Edward Grieco, PSY.D.
• Alyson Grossman
• Lawrence Guerra, PH.D.
• Kendra Guzman Lucero, M.A., CF-SLP, TSSLD
• Diana Guzman
• Melanie H Harmatz, M.A., CCC-SLP
• Harmony Heights
• Joy Harrison, M.D.

• Pediatrics Physician in Oyster Bay, NY
• Providers in Oyster Bay, NY by specialty
• Pediatrics Physician in New York

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jul 13, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.