Andrew Mark Gregg, MD PHD

Primary specialty

Gastroenterology PhysicianTaxonomy code 207RG0100X

License

A177654 Issued in CA

Practice address

248 Hampshire Rd Ste 200
Thousand Oaks, CA 91361-2401

Phone

(805) 370-0127

NPI assigned

Mar 18, 2019

Last updated

Aug 4, 2025By the provider in NPPES

Sex

Male

Sole proprietor

Yes

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

Specialties & licenses 1

Addresses

Medicare fee-for-service enrollment

Enrolled in CA

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

GastroenterologyAlso: Internal Medicine

Education

Other, 2019

Medicare assignment

Accepts the Medicare-approved amount as payment in full

Telehealth

Offers telehealth services

Group practices

The Regents of the University of CaliforniaGroup PAC ID 1355248584, shared by 11 NPIs, 1,426 clinicians

Practice addresses (Care Compare)

Hospital & facility affiliations

• Los Robles Hospital & Medical Center Hospital, Thousand Oaks, CA, CCN 050549
• UCLA West Valley Medical Center Hospital, West Hills, CA, CCN 050481
• Ronald Reagan UCLA Medical Center Hospital, Los Angeles, CA, CCN 050262

Procedures performed for Medicare patients

Medicare enrollment (NPD)

Enrolled

Credentials

Doctor of Medicine, Doctor of Philosophy

Practice roles

Locations

Interoperability endpoints

• Direct secure messaging: agregg693776@direct.uclahealth.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.

• The Regents of the University of California

  dba UCLA Dept of Medicine

  • Ambulatory Surgical Clinic/Center
  • West Hills, CA
  • NPI 1215381843
  Medicare reassignment NPD
• The Regents of the University of California

  dba UCLA Dept of Medicine

  • Internal Medicine Physician
  • Los Angeles, CA
  • NPI 1235107566

  Gastroenterology

  Medicare reassignment NPD
• The Regents of the University of California

  • Ambulatory Surgical Clinic/Center
  • North Hollywood, CA
  • NPI 1366041469
  Medicare reassignment NPD
• The Regents of the University of California

  dba UCLA Dept of Medicine

  • Ambulatory Surgical Clinic/Center
  • Valencia, CA
  • NPI 1689200305
  NPD

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

• Los Robles Regional Medical Center

  dba Los Robles Hospital & Medical Center

  • General Acute Care Hospital
  • Thousand Oaks, CA
  • NPI 1306890389
  Care Compare affiliation
• Regents Univ of Calif Los Angeles

  dba UCLA West Valley Medical Center

  • General Acute Care Hospital
  • West Hills, CA
  • NPI 1801653969
  Care Compare affiliation
• Regents Univ of Calif Los Angeles

  dba Ronald Reagan UCLA Medical Center

  • General Acute Care Hospital
  • Los Angeles, CA
  • NPI 1902803315
  Care Compare affiliation

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

{
    "created_epoch": "1552867200000",
    "enumeration_type": "NPI-1",
    "last_updated_epoch": "1754265600000",
    "number": "1942769104",
    "addresses": [
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "MAILING",
            "address_type": "DOM",
            "address_1": "5767 W CENTURY BLVD STE 400",
            "city": "LOS ANGELES",
            "state": "CA",
            "postal_code": "900455631"
        },
        {
            "country_code": "US",
            "country_name": "United States",
            "address_purpose": "LOCATION",
            "address_type": "DOM",
            "address_1": "248 HAMPSHIRE RD STE 200",
            "city": "THOUSAND OAKS",
            "state": "CA",
            "postal_code": "913612401",
            "telephone_number": "805-370-0127"
        }
    ],
    "practiceLocations": [],
    "basic": {
        "last_name": "GREGG",
        "first_name": "ANDREW",
        "middle_name": "MARK",
        "name_prefix": "Dr.",
        "credential": "MD PHD",
        "sole_proprietor": "YES",
        "sex": "M",
        "enumeration_date": "2019-03-18",
        "last_updated": "2025-08-04",
        "certification_date": "2025-08-04",
        "status": "A"
    },
    "taxonomies": [
        {
            "code": "207RG0100X",
            "taxonomy_group": "",
            "desc": "Internal Medicine, Gastroenterology",
            "state": "CA",
            "license": "A177654",
            "primary": true
        }
    ],
    "identifiers": [],
    "endpoints": [],
    "other_names": []
}

• Kamia Green
• Kristin Stiles Green, ND
• Richard M Green, M.D.
• Patrick Greene, BA
• Cheyenne Lee Greenhouse, MD
• Gregory a Celaya Chiropractic Corporation
• Gregory H Johnson MD Inc
• Gregory H Tchejeyan MD Inc
• Wendy Gregson, LMFT
• Jason C Griffith, O.D.

• Gastroenterology Physician in Thousand Oaks, CA
• Providers in Thousand Oaks, CA by specialty
• Gastroenterology Physician in California

• NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Aug 4, 2025; 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.