Guillaume Bassil, M.D.

Primary specialty

Cardiovascular Disease PhysicianTaxonomy code 207RC0000X

License

67298 Issued in CT

Practice address

18 W 18TH St
New York, NY 10011-4607

Phone

(917) 512-8500

NPI assigned

Apr 6, 2015

Sex

Male

Sole proprietor

No

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

Specialties & licenses 3

Addresses

Medicare fee-for-service enrollment

Enrolled in NY

Eligible to order & refer

• Part B services: Yes
• Medical equipment: Yes
• Home health: Yes
• Power mobility devices: Yes
• Hospice: Yes

Green means eligible to order or refer.

Enrollment records 1

Specialty

Cardiovascular Disease (Cardiology)

Education

Other, 2013

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

City Medical of Upper East Side PLLCGroup PAC ID 0648465039, 658 clinicians

Practice addresses (Care Compare)

Merit-based Incentive Payment System (MIPS)

Final score

86.33 of 100Reported as group

Quality

82.1

Promoting interoperability

100

Improvement activities

40

Cost

72.34

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles (4 of 8)

Locations

Networks

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

Interoperability endpoints

• Direct secure messaging: guillaume.bassil.1@2983.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.

• City Medical of Upper East Side, PLLC

  • Urgent Care Clinic/Center
  • New York, NY
  • NPI 1801277629

  NY

  Medicare reassignment Care Compare group NPD
• City Medical of Upper East Side, PLLC

  • Urgent Care Clinic/Center
  • Bayside, NY
  • NPI 1790412443
  Care Compare group
• City Medical of Upper East Side, PLLC

  • Urgent Care Clinic/Center
  • Norwalk, CT
  • NPI 1851132831
  Care Compare group
• City Medical of Upper East Side, PLLC

  • Urgent Care Clinic/Center
  • New York, NY
  • NPI 1730491945
  NPD
• City Medical of Upper East Side, PLLC

  • Urgent Care Clinic/Center
  • New York, NY
  • NPI 1740913763
  NPD
• Northeast Medical Group, Inc.

  • Internal Medicine Physician
  • Bridgeport, CT
  • NPI 1043278351

  Cardiovascular Disease

  NPD (past)

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

{
    "created_epoch": "1428278400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1770940800000",
    "number": "1235524372",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "505 E 70TH ST",
            "address_2": "WEILL CORNELL INTERNAL MEDICINE AS",
            "city": "NEW YORK",
            "state": "NY",
            "postal_code": "100214872"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "18 W 18TH ST",
            "city": "NEW YORK",
            "state": "NY",
            "postal_code": "100114607",
            "telephone_number": "917-512-8500"
        }
    ],
    "practiceLocations": [
        {
            "address_1": "2200 Whitney Ave Ste 180",
            "address_purpose": "LOCATION",
            "city": "Hamden",
            "state": "CT",
            "postal_code": "065183602",
            "country_code": "US",
            "telephone_number": "203-407-2500",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "basic": {
        "last_name": "BASSIL",
        "first_name": "GUILLAUME",
        "credential": "M.D.",
        "sole_proprietor": "NO",
        "sex": "M",
        "enumeration_date": "2015-04-06",
        "last_updated": "2026-02-13",
        "certification_date": "2026-02-13",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RI0011X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Interventional Cardiology",
            "state": "CT",
            "license": "67298",
            "primary": false
        },
        {
            "code": "207RC0000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Cardiovascular Disease",
            "state": "CT",
            "license": "67298",
            "primary": true
        },
        {
            "code": "207RC0000X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Cardiovascular Disease",
            "state": "NY",
            "license": "293038",
            "primary": false
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Jennifer Alisha Bassetti, MD
• Idongesit Mfon Bassey, NP
• Yarromi Bassey, MD
• Simon Basseyn, M.D.
• Corinne Bassi, CCC-SLP
• Karim Bassily, DDS
• Donna Bassin, PHD
• Pamela Bassin, MD
• Nadia Bassino Balta, LP
• Brian Bassiri-Tehrani, MD

• All providers in New York, NY
• Cardiovascular Disease Physician in New York

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Feb 13, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
• Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
• Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
• National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.

Verify at the official NPI Registry.