Gretchen Giovanna De Diego Cornier, M.D.

Primary specialty

Student in an Organized Health Care Education/Training ProgramTaxonomy code 390200000X

Practice address

1000 10TH Ave
New York, NY 10019-1147

Phone

(212) 523-4000

NPI assigned

Apr 5, 2017

Last updated

Aug 25, 2026By the provider in NPPES

Sex

Female

Sole proprietor

Yes

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

Specialties & licenses 1

Addresses

Other names 1

• Gretchen Giovanna De Diego Former name

Electronic endpoints 1

Medicare fee-for-service enrollment

Enrolled in PA

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

Critical Care (Intensivists)

Education

Loyola University of Chicago, Stritch School of Medicine, 2017

Medicare assignment

May accept Medicare assignment

Practice addresses (Care Compare)

Hospital & facility affiliations

• Upmc Altoona Hospital, Altoona, PA, CCN 390073

Merit-based Incentive Payment System (MIPS)

Final score

96.06 of 100Reported as group

Quality

85

Improvement activities

40

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: gretchen.dediego@hca4.eclinicaldirectplus.com

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.

• Pittsburgh Critical Care Associates, Inc

  • Critical Care Medicine (Internal Medicine) Physician
  • Altoona, PA
  • NPI 1497703680
  NPD
• Upmc Altoona

  • General Acute Care Hospital
  • Altoona, PA
  • NPI 1649278730
  NPD (past)

Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.

• Upmc Altoona

  • Ambulatory Surgical Clinic/Center
  • Altoona, PA
  • NPI 1114926953

  Hospital

  Care Compare affiliation
• Upmc Altoona

  dba Women's Health and Wellness

  • Non-Surgical Family Planning Clinic/Center
  • Altoona, PA
  • NPI 1457303885

  Hospital

  Care Compare affiliation
• Upmc Altoona

  • General Acute Care Hospital
  • Altoona, PA
  • NPI 1649278730
  Care Compare affiliation
• Upmc Altoona

  • Psychiatric Hospital Unit
  • Altoona, PA
  • NPI 1699773465
  Care Compare affiliation

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

{
    "created_epoch": "1491350400000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1787616000000",
    "number": "1851824007",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "1111 AMSTERDAM AVE",
            "city": "NEW YORK",
            "state": "NY",
            "postal_code": "100251716",
            "telephone_number": "212-523-3610",
            "fax_number": "212-523-3609"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "1000 10TH AVE",
            "city": "NEW YORK",
            "state": "NY",
            "postal_code": "100191147",
            "telephone_number": "212-523-4000"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "DE DIEGO CORNIER",
        "first_name": "GRETCHEN",
        "middle_name": "GIOVANNA",
        "credential": "M.D.",
        "sole_proprietor": "YES",
        "sex": "F",
        "enumeration_date": "2017-04-05",
        "last_updated": "2026-08-25",
        "certification_date": "2020-06-07",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "390200000X",
            "taxonomy_group": "",
            "desc": "Student in an Organized Health Care Education/Training Program",
            "state": null,
            "license": null,
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [
        {
            "endpointType": "DIRECT",
            "endpointTypeDescription": "Direct Messaging Address",
            "endpoint": "gdediegocornier538391@upmc.direct-ci.com",
            "affiliation": "N",
            "address_1": "600 Grant St",
            "address_2": "Floor 58",
            "city": "Pittsburgh",
            "state": "PA",
            "country_code": "US",
            "postal_code": "152192702",
            "country_name": "United States",
            "address_type": "DOM"
        }
    ],
    "other_names": [
        {
            "first_name": "GRETCHEN",
            "last_name": "DE DIEGO",
            "middle_name": "GIOVANNA",
            "credential": "MD",
            "code": "1",
            "type": "Former Name"
        }
    ]
}

• Jentry Ann De Castro, DNP, FNP-C
• Leonida De Castro
• Angela De Cordova, PHARMD
• Colombage Asha De Costa, LMHC, ED.M
• John De Csepel, MD
• Carlo Flaviano De Felipe, PT
• Michelle De Freitas-Montes, MD, MSC
• Sebastien De Galicia, PA
• Gabriel De Gedeon
• Michael De Giglio, RPH

• Student in an Organized Health Care Education/Training Program in New York, NY
• Providers in New York, NY by specialty
• Student in an Organized Health Care Education/Training Program in New York

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