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



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 Clara1254244973732

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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

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Entity NameCounty Of Santa Clara
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1659450955
PECOS PAC ID: 1254244973
Enrollment ID: O20040113000757

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Entity NameCounty Of Santa Clara
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1699885079
PECOS PAC ID: 1254244973
Enrollment ID: O20040113000784

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Entity NamePeninsula Gastroenterology Medical Group, Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1558434589
PECOS PAC ID: 4082661392
Enrollment ID: O20050407000820

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Entity NameCounty Of Santa Clara
Entity TypePart B Supplier - Other Medical Care Group
Entity IdentifiersNPI Number: 1629301346
PECOS PAC ID: 1254244973
Enrollment ID: O20110318000170

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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

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Internal Medicine Doctors in Stanford, CA

Prista Charuworn, MD
Gastroenterology
Medicare: Not Enrolled in Medicare
Practice Location: 300 Pasteur Dr, Alway Build M211, Mc 5187, Stanford, CA 94305
Phone: 650-723-6661    
Dr. Yu Kuang Lai, MD
Gastroenterology
Medicare: Accepting Medicare Assignments
Practice Location: 300 Pasteur Dr, Stanford, CA 94305
Phone: 650-723-4000    
Andrea Lorenze, M.D.
Gastroenterology
Medicare: Accepting Medicare Assignments
Practice Location: 300 Pasteur Drive, Lane 154, Stanford, CA 94305
Phone: 650-723-6661    Fax: 650-498-6205
Audra Horomanski,
Gastroenterology
Medicare: Accepting Medicare Assignments
Practice Location: 300 Pasteur Dr, Stanford, CA 94305
Phone: 650-723-4000    Fax: 650-498-6205
Dr. Meghan Brady Marmor, MD
Gastroenterology
Medicare: Accepting Medicare Assignments
Practice Location: 300 Pasteur Dr, H3143, Stanford, CA 94305
Phone: 650-723-1150    Fax: 650-725-5489
Lauren Michelle Ulsh, MD
Gastroenterology
Medicare: Medicare Enrolled
Practice Location: 300 Pasteur Dr, Stanford, CA 94305
Phone: 650-723-4000    

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