Grace Si-wah Eng, MD - Medicare Endocrinology in Emeryville, CA

Grace Si-wah Eng, MD is a medicare enrolled "Internal Medicine - Endocrinology, Diabetes & Metabolism" physician in Emeryville, California. She went to University Of Michigan Medical School and graduated in 1999 and has 25 years of diverse experience with area of expertise as Endocrinology. She is a member of the group practice University Healthcare Alliance, Stanford Health Care and her current practice location is 5800 Hollis St, Emeryville, California. You can reach out to her office (for appointments etc.) via phone at (510) 806-2100.

Grace Si-wah Eng is licensed to practice in California (license number A86467) 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 1871552679.

Contact Information

Grace Si-wah Eng, MD
5800 Hollis St,
Emeryville, CA 94608-2016
(510) 806-2100
(510) 806-2557

Map and Direction




Physician's Profile

Full NameGrace Si-wah Eng
GenderFemale
SpecialityEndocrinology
Experience25 Years
Location5800 Hollis St, Emeryville, 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:
  • Grace Si-wah Eng attended and graduated from University Of Michigan Medical School in 1999
  NPI Data:
  • NPI Number: 1871552679
  • Provider Enumeration Date: 03/21/2006
  • Last Update Date: 04/29/2024
  Medicare PECOS Information:
  • PECOS PAC ID: 7113907825
  • Enrollment ID: I20040722001345

Medical Identifiers

Medical identifiers for Grace Si-wah Eng such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1871552679NPI-NPPES

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207R00000XInternal Medicine A86467 (California)Secondary
207RE0101XInternal Medicine - Endocrinology, Diabetes & Metabolism A86467 (California)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Stanford Health CareStanford, CAHospital
Alta Bates Summit Medical Center - Alta Bates CampBerkeley, CAHospital
Alta Bates Summit Medical CenterOakland, CAHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
University Healthcare Alliance6305748799341
Stanford Health Care67097974912579

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. Grace Si-wah Eng 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 NameUniversity Healthcare Alliance
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1760531198
PECOS PAC ID: 6305748799
Enrollment ID: O20040126000292

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. Grace Si-wah Eng 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
Grace Si-wah Eng, MD
5800 Hollis St,
Emeryville, CA 94608-2016

Ph: (510) 806-2100
Grace Si-wah Eng, MD
5800 Hollis St,
Emeryville, CA 94608-2016

Ph: (510) 806-2100

Reviews and Comments


Internal Medicine Doctors in Emeryville, CA

Clare Elizabeth Moynihan, MD
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Medicare: Accepting Medicare Assignments
Practice Location: 5800 Hollis St, Emeryville, CA 94608
Phone: 510-806-2100    
Piyal P Patel, DO
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Medicare: Accepting Medicare Assignments
Practice Location: 2100 Powell St Ste 400, Emeryville, CA 94608
Phone: 510-851-7501    Fax: 510-851-7446
Dr. Lewis Gamarra, M.D.
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Medicare: Accepting Medicare Assignments
Practice Location: 2100 Powell St Ste 400, Emeryville, CA 94608
Phone: 510-851-7501    Fax: 510-851-7446
Dr. Ritbune Prakobkit, M.D.
Endocrinology, Diabetes & Metabolism
Medicare: Accepting Medicare Assignments
Practice Location: 2100 Powell St Ste 400, Emeryville, CA 94608
Phone: 510-279-8390    Fax: 833-260-3191
Nadine Khalil Sbaih, MD
Endocrinology, Diabetes & Metabolism
Medicare: Medicare Enrolled
Practice Location: 6121 Hollis St Ste 400, Emeryville, CA 94608
Phone: 510-266-5400    
Dr. Lorilyn L Seid, M.D.
Endocrinology, Diabetes & Metabolism
Medicare: Not Enrolled in Medicare
Practice Location: 1250 45th St, Ste 355, Emeryville, CA 94608
Phone: 510-596-8988    Fax: 510-596-8956
Ariadne Guinevere Lie, MD
Endocrinology, Diabetes & Metabolism
Medicare: Accepting Medicare Assignments
Practice Location: 5800 Hollis St, Emeryville, CA 94608
Phone: 510-806-2238    

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.