Heidi S Flagg, MD

Primary specialty

Obstetrics & Gynecology PhysicianTaxonomy code 207V00000X

License

213720 Issued in NY

Practice address

135 Spring St
2ND FL
New York, NY 10012-3858

Phone

(212) 219-1187

Fax

(212) 219-1538

NPI assigned

Oct 9, 2005

Sex

Female

Sole proprietor

No

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

Specialties & licenses 1

Addresses

Other names 1

• Heidi Snyder Former name

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

Interoperability endpoints

• FHIR API: https://api.platform.athenahealth.com/6738/brand/1/csg/1/fhir/r4
• Direct secure messaging: hflagg67300@northwell.direct-ci.com
• Direct secure messaging: heidi.flagg.1@6738.direct.athenahealth.com

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.

• Spring OBGYN PC

  • Obstetrics & Gynecology Physician
  • New York, NY
  • NPI 1235127820
  NPD (past)

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

{
    "created_epoch": "1128816000000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1783900800000",
    "number": "1053309641",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "PO BOX 2003",
            "city": "EAST SYRACUSE",
            "state": "NY",
            "postal_code": "130574503",
            "telephone_number": "315-446-3904",
            "fax_number": "315-445-2936"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "135 SPRING ST",
            "address_2": "2ND FL",
            "city": "NEW YORK",
            "state": "NY",
            "postal_code": "100123858",
            "telephone_number": "212-219-1187",
            "fax_number": "212-219-1538"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "FLAGG",
        "first_name": "HEIDI",
        "middle_name": "S",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2005-10-09",
        "last_updated": "2026-07-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207V00000X",
            "taxonomy_group": "",
            "desc": "Obstetrics & Gynecology",
            "state": "NY",
            "license": "213720",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": [
        {
            "first_name": "HEIDI",
            "last_name": "SNYDER",
            "code": "1",
            "type": "Former Name"
        }
    ]
}

• Holli M Flack, LMSW
• Yolanda Flack
• Henry R. Flacks, L.C.S.W.
• Genevieve Flagello, LCSW
• Elizabeth Flagg
• Sabrina Clarissa Flagg, M.S. CCC-SLP, TSLD
• Thomas Anthony Flagiello, MD
• Flagler Medical of California PC
• Flagler Medical of New Jersey PC
• Flagler Medical PC

• Obstetrics & Gynecology Physician in New York, NY
• Providers in New York, NY by specialty
• Obstetrics & Gynecology 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.