Dr Andrew Mark Gregg, MD PHD - Medicare Gastroenterology in Thousand Oaks, CA

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Dr Andrew Mark Gregg, MD PHD is a medicare enrolled "Internal Medicine - Gastroenterology" physician in Thousand Oaks, California. He graduated from medical school in 2019 and has 7 years of diverse experience with area of expertise as Gastroenterology. He is a member of the group practice The Regents Of The University Of California and his current practice location is 248 Hampshire Rd Ste 200, Thousand Oaks, California. You can reach out to his office (for appointments etc.) via phone at (805) 370-0127.

Dr Andrew Mark Gregg is licensed to practice in California (license number A177654) and he also participates in the medicare program. He accepts medicare assignments (which means he accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and his NPI Number is 1942769104.

Contact Information

Dr Andrew Mark Gregg, MD PHD
248 Hampshire Rd Ste 200,
Thousand Oaks, CA 91361-2401
(805) 370-0127
Not Available

Map and Direction




Physician's Profile

Full NameDr Andrew Mark Gregg
GenderMale
SpecialityGastroenterology
Experience7 Years
Location248 Hampshire Rd Ste 200, Thousand Oaks, California
Accepts Medicare AssignmentsYes. He accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Dr Andrew Mark Gregg graduated from medical school in 2019
  NPI Data:
  • NPI Number: 1942769104
  • Provider Enumeration Date: 03/18/2019
  • Last Update Date: 08/04/2025
  Medicare PECOS Information:
  • PECOS PAC ID: 3173933025
  • Enrollment ID: I20250618001840

Medical Identifiers

Medical identifiers for Dr Andrew Mark Gregg such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1942769104NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207RG0100XInternal Medicine - Gastroenterology A177654 (California)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Los Robles Hospital & Medical CenterThousand oaks, CAHospital
Ucla West Valley Medical CenterWest hills, CAHospital
Ronald Reagan Ucla Medical CenterLos angeles, CAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
The Regents Of The University Of California13552485841426

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Dr Andrew Mark Gregg allows following entities to bill medicare on his behalf.
Entity NameThe Regents of the University of California
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1235107566
PECOS PAC ID: 1355248584
Enrollment ID: O20031223000439
Entity NameThe Regents of the University of California
Entity TypePart B Supplier - Ambulatory Surgical Center
Entity IdentifiersNPI Number: 1215381843
PECOS PAC ID: 1355248584
Enrollment ID: O20160817003054
Entity NameThe Regents of the University of California
Entity TypePart B Supplier - Ambulatory Surgical Center
Entity IdentifiersNPI Number: 1366041469
PECOS PAC ID: 1355248584
Enrollment ID: O20210205002160

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Dr Andrew Mark Gregg is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Dr Andrew Mark Gregg, MD PHD
5767 W Century Blvd Ste 400,
Los Angeles, CA 90045-5631

Ph: Not Available		Dr Andrew Mark Gregg, MD PHD
248 Hampshire Rd Ste 200,
Thousand Oaks, CA 91361-2401

Ph: (805) 370-0127

Reviews and Comments


Internal Medicine Doctors in Thousand Oaks, CA

Dr. Nusayba Manal Ahmed, MD
Gastroenterology
Medicare: Medicare Enrolled
Practice Location: 215 W Janss Rd, Thousand Oaks, CA 91360
Phone: 805-852-9229    
Dr. Anthony Capparelli, M.D.
Gastroenterology
Medicare: Not Enrolled in Medicare
Practice Location: 375 Rolling Oaks Dr, Suite 100, Thousand Oaks, CA 91361
Phone: 805-497-7775    Fax: 805-557-1074
John Y. Hess, M.D.
Gastroenterology
Medicare: Not Enrolled in Medicare
Practice Location: 2220 Lynn Rd, 201, Thousand Oaks, CA 91360
Phone: 805-494-9494    Fax: 805-374-9994
Dr. David Paul Pryor, M.D.
Gastroenterology
Medicare: Not Enrolled in Medicare
Practice Location: 1683 Calle Rochelle, Thousand Oaks, CA 91360
Phone: 805-558-7059    
Dzenana Cabaravdic, MD
Gastroenterology
Medicare: Accepting Medicare Assignments
Practice Location: 215 W Janss Rd, Thousand Oaks, CA 91360
Phone: 805-497-2727    
Dr. Saibal Kar, M.D.
Gastroenterology
Medicare: Accepting Medicare Assignments
Practice Location: 227 W Janss Rd Ste 340, Thousand Oaks, CA 91360
Phone: 805-852-9100    Fax: 805-852-9101
Lauren Hanna Beshay, MD
Gastroenterology
Medicare: Accepting Medicare Assignments
Practice Location: 100 Moody Ct Ste 200, Thousand Oaks, CA 91360
Phone: 805-418-3500    

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.