Stylianos Nicholas Theofanidis, MD

Primary specialty

Neonatal-Perinatal Medicine PhysicianTaxonomy code 2080N0001X

License

028038 Issued in CT

Practice address

5 Perryridge Road
Greenwich Hospital
Greenwich, CT 06830-4697

Phone

(203) 863-3515

Fax

(203) 863-3816

NPI assigned

Jul 19, 2006

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

Medicare fee-for-service enrollment

Not listed in the public Medicare enrollment file

Medicare enrollment (NPD)

Not enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

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.

• Greenwich Neonatology Associates, LLC

  • Neonatal-Perinatal Medicine Physician
  • Greenwich, CT
  • NPI 1972769032
  NPD (past) Authorized official

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

{
    "created_epoch": "1153267200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1757548800000",
    "number": "1912926908",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 673",
            "city": "OLD GREENWICH",
            "state": "CT",
            "postal_code": "068700673",
            "telephone_number": "203-863-3515",
            "fax_number": "203-863-3816"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "5 PERRYRIDGE ROAD",
            "address_2": "GREENWICH HOSPITAL",
            "city": "GREENWICH",
            "state": "CT",
            "postal_code": "068304697",
            "telephone_number": "203-863-3515",
            "fax_number": "203-863-3816"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "THEOFANIDIS",
        "first_name": "STYLIANOS",
        "middle_name": "NICHOLAS",
        "name_prefix": "Dr.",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2006-07-19",
        "last_updated": "2025-09-11",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "208000000X",
            "taxonomy_group": "",
            "desc": "Pediatrics",
            "state": "CT",
            "license": "028038",
            "primary": false
        },
        {
            "code": "2080N0001X",
            "taxonomy_group": "",
            "desc": "Pediatrics, Neonatal-Perinatal Medicine",
            "state": "CT",
            "license": "028038",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• The Greenwich Practice
• The Metabolic Dietitian PLLC
• The Plastic and Reconstructive Surgery Group, PC
• The Westchester Medical Group PC
• Ruth Sandra Theaman, LCSW-R
• Sara Thies Feldman, LCSW
• Shailin Andrew Thomas, MD (AS OF MAY 2022)
• Alison Thompson, M.D.
• Mark Thompson
• Lindsay Tiscia

• Neonatal-Perinatal Medicine Physician in Greenwich, CT
• Providers in Greenwich, CT by specialty
• Neonatal-Perinatal Medicine Physician in Connecticut

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 11, 2025; 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.