Mary G Diana, MD

Primary specialty

Obstetrics & Gynecology PhysicianTaxonomy code 207V00000X

License

200058 Issued in NY

Practice address

5 Perryridge Rd
Greenwich, CT 06830-4697

Phone

(203) 863-3000

NPI assigned

Jun 13, 2006

Last updated

Sep 25, 2026By the provider in NPPES

Sex

Female

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

Enrolled in NY, CT2 enrollments

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 2

Specialty

Obstetrics/Gynecology

Education

Columbia University College of Physicians and Surgeons, 1992

Medicare assignment

May accept Medicare assignment

Group practices

Montefiore Medical CenterGroup PAC ID 3779496021, 2,809 clinicians

Yale UniversityGroup PAC ID 9436061736, 2,632 clinicians

Practice addresses (Care Compare)

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

State licenses

Practice roles

Locations

Networks

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

Interoperability endpoints

• Direct secure messaging: mdiana@direct.health-quest.org

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.

• Yale University

  dba Yale Medicine

  • Anesthesiology Physician
  • New Haven, CT
  • NPI 1205822236

  Obstetrics & Gynecology

  Medicare reassignment Care Compare group NPD
• Montefiore Medical Center

  • Anesthesiology Physician
  • Bronx, NY
  • NPI 1063525152

  Obstetrics & Gynecology

  Medicare reassignment Care Compare group NPD
• Greenwich Hospital

  • General Acute Care Hospital
  • Greenwich, CT
  • NPI 1609846088
  Medicare reassignment NPD
• Crystal Run Healthcare Physicians LLP

  • General Practice Physician
  • Middletown, NY
  • NPI 1952376410
  Medicare reassignment NPD
• OBGYN Hospitalist Medical Services of New York, P.C.

  • Obstetrics & Gynecology Physician
  • Niskayuna, NY
  • NPI 1518285055
  Medicare reassignment NPD
• Obhg Connecticut PC

  • Obstetrics & Gynecology Physician
  • Greenville, SC
  • NPI 1861985129

  CT

  Medicare reassignment NPD
• Greenwich Hospital

  • Community Based Hospice Care Agency
  • Stanford, CT
  • NPI 1073637724
  NPD
• Yale University

  • Durable Medical Equipment & Medical Supplies
  • Fairfield, CT
  • NPI 1548066962
  NPD
• Crystal Run Healthcare Physicians LLP

  • Durable Medical Equipment & Medical Supplies
  • Monroe, NY
  • NPI 1558857425
  NPD
• Montefiore Medical Center

  dba Montefiore Community Pharmacy @ CHAM

  • Community/Retail Pharmacy
  • Bronx, NY
  • NPI 1194183715
  NPD
• Avery Center for OBGYN PC

  • Obstetrics & Gynecology Physician
  • Westport, CT
  • NPI 1922175587
  NPD (past)
• Garnet Health Medical Center

  • General Acute Care Hospital
  • Middletown, NY
  • NPI 1609875772
  NPD (past)

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

{
    "created_epoch": "1150156800000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1790294400000",
    "number": "1962445684",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "31 CHICHESTER RD",
            "city": "NEW CANAAN",
            "state": "CT",
            "postal_code": "068403912",
            "telephone_number": "845-325-6127"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "5 PERRYRIDGE RD",
            "city": "GREENWICH",
            "state": "CT",
            "postal_code": "068304697",
            "telephone_number": "203-863-3000"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "DIANA",
        "first_name": "MARY",
        "middle_name": "G",
        "credential": "MD",
        "sole_proprietor": "NO",
        "sex": "F",
        "enumeration_date": "2006-06-13",
        "last_updated": "2026-09-25",
        "certification_date": "2026-09-25",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207V00000X",
            "taxonomy_group": "",
            "desc": "Obstetrics & Gynecology",
            "state": "CT",
            "license": "56749",
            "primary": false
        },
        {
            "code": "207V00000X",
            "taxonomy_group": "",
            "desc": "Obstetrics & Gynecology",
            "state": "NY",
            "license": "200058",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Maryfrances Lanosa Desteno, APRN
• Barbara Jean Devine, D.M.D. M.A.G.D.
• Sheila Devlin-Craane, DNP,MSN,APRN,NPP,BC
• Diagnostic and Medical Specialists of Greenwich
• Eric J Diamond, M.D.
• Jesus Andres Diaz la Torre, APRN
• Kendall Dicairano
• Mitchell Dickey, PH.D.
• Justine Dimaria
• Jessie Dimuzio, LCSW

• Obstetrics & Gynecology Physician in Greenwich, CT
• Providers in Greenwich, CT by specialty
• Obstetrics & Gynecology Physician in Connecticut

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 25, 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.