Ann M Chen, MD - Medicare Gastroenterology in Stanford, CA

Ann M Chen, MD is a medicare enrolled "Internal Medicine - Gastroenterology" physician in Stanford, California. She went to Albert Einstein College Of Medicine Of Yeshiva University and graduated in 2000 and has 24 years of diverse experience with area of expertise as Gastroenterology. She is a member of the group practice County Of Santa Clara and her current practice location is 300 Pasteur Dr, A149, Mc5202, Stanford, California. You can reach out to her office (for appointments etc.) via phone at (650) 725-3376.

Ann M Chen is licensed to practice in California (license number A76890) and she also participates in the medicare program. She accepts medicare assignments (which means she accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and her NPI Number is 1003840307.

Contact Information

Ann M Chen, MD
300 Pasteur Dr, A149, Mc5202,
Stanford, CA 94305-2200
(650) 725-3376
(650) 723-8305

Map and Direction




Physician's Profile

Full NameAnn M Chen
GenderFemale
SpecialityGastroenterology
Experience24 Years
Location300 Pasteur Dr, Stanford, California
Accepts Medicare AssignmentsYes. She accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Ann M Chen attended and graduated from Albert Einstein College Of Medicine Of Yeshiva University in 2000
  NPI Data:
  • NPI Number: 1003840307
  • Provider Enumeration Date: 07/10/2006
  • Last Update Date: 01/10/2009
  Medicare PECOS Information:
  • PECOS PAC ID: 5395702971
  • Enrollment ID: I20041215000417

Medical Identifiers

Medical identifiers for Ann M Chen such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1003840307NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207RG0100XInternal Medicine - Gastroenterology A76890 (California)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Santa Clara Valley Medical CenterSan jose, CAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
County Of Santa Clara1254244973722

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. Ann M Chen allows following entities to bill medicare on her behalf.
Entity NameStanford Health Care
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1437292927
PECOS PAC ID: 6709797491
Enrollment ID: O20031124000348
Entity NameCounty Of Santa Clara
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1659450955
PECOS PAC ID: 1254244973
Enrollment ID: O20040113000757
Entity NameCounty Of Santa Clara
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1699885079
PECOS PAC ID: 1254244973
Enrollment ID: O20040113000784
Entity NamePeninsula Gastroenterology Medical Group, Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1558434589
PECOS PAC ID: 4082661392
Enrollment ID: O20050407000820
Entity NameCounty Of Santa Clara
Entity TypePart B Supplier - Other Medical Care Group
Entity IdentifiersNPI Number: 1629301346
PECOS PAC ID: 1254244973
Enrollment ID: O20110318000170

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. Ann M Chen 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
Ann M Chen, MD
300 Pasteur Dr, A149, Mc5202,
Stanford, CA 94305-2200

Ph: (650) 725-3376
Ann M Chen, MD
300 Pasteur Dr, A149, Mc5202,
Stanford, CA 94305-2200

Ph: (650) 725-3376

Reviews and Comments


Internal Medicine Doctors in Stanford, CA

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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.