Yi Yi Stephanie Gu, M.D.
Rheumatology Physician · Oakland, CA
Yi Yi Stephanie Gu, M.D. is a rheumatology physician with a practice address in Oakland, California, and NPI 1932183472, issued on Nov 29, 2005. Check the license (California A88414, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Yi Yi Stephanie Gu
- Credential
- M.D.
- Primary taxonomy
- Rheumatology Physician 207RR0500X
- License number
- A88414 CA
Self-reported in NPPES; status is on the state search - Practice location
- 350 30TH St, Oakland, CA 94609
- Phone
- (510) 465-6700
- Enumerated
- Nov 29, 2005
- Record last updated
- Jan 6, 2022
- Fax
- (510) 465-7765
- Medicare enrollment
- Enrolled (PECOS I20061103000322); accepts Medicare assignment
- Medical or professional school
- University Of California, Davis School Of Medicine, 2003
- Entity
- Type 1 · individual
8 nearest rheumatology physician records → All 926 in California → Look up another NPI →
Also registered at 350 30TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Vanessa AuBone Densitometry Radiologic Technologist1972671725
- Christopher Bautista, M.D.Internal Medicine Physician1346539509
- Lori Beltran, D.O.Family Medicine Physician1053567768
- Alice Benham, NPFamily Nurse Practitioner1578611570
- Rachel Callaghan, M.D.Internal Medicine Physician1548239627
- Cyril Callister, PA-CMedical Physician Assistant1871518977
Verify Yi Yi Stephanie Gu in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A88414Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
24% fewer Medicare Part D claims than the average rheumatology physician in 2024
1,511 Medicare Part D claims for 375 beneficiaries, against an average of 1,978 among the 6,301 providers of this specialty who prescribed in Part D. 34 claims were for opioids.
Most prescribed
- Prednisone271 claims
- Methotrexate221 claims
- Hydroxychloroquine Sulfate132 claims
- Allopurinol129 claims
- Xeljanz89 claims
- Colchicine58 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Permanente Medical Group IncSouth San Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Yi Yi Stephanie Gu among 926 rheumatology physician records in California
Yi Yi Stephanie Gu, M.D. is one of 926 rheumatology physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 94% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2003 · median 2003 among the 641 with a school on file
- Record last updated2022 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RR0500X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Rheumatology Physician providers in California
There are 926 rheumatology physician records in California.
All 926 in California → Every provider in Oakland → Rheumatology Physician nationwide →
The 8 rheumatology physician records with the nearest ZIP codes
- Chee Chow, MDOakland, CA 946111003994872
- Arezoo Haghshenas, M.D.Oakland, CA 946111881011856
- Lucy LiuOakland, CA 946111346510575
- Kate Scannell, MDOakland, CA 946111508902107
- Jose Troncoso, MDOakland, CA 946111457439234
- Paul Feigenbaum, MDOakland, CA 946121710063243
- Shweta Kishore, MDOakland, CA 946021912242462
- Ernest Maningding, MD, MPHOakland, CA 946021831551274
Common questions
What is Yi Yi Stephanie Gu, M.D.'s NPI number?
Yi Yi Stephanie Gu, M.D.'s National Provider Identifier (NPI) is 1932183472, issued on Nov 29, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Yi Yi Stephanie Gu, M.D. located?
The NPPES record lists a practice address at 350 30TH St, Oakland, CA, 94609. Phone: (510) 465-6700. Providers update this record themselves, so call before visiting.
How can I verify Yi Yi Stephanie Gu, M.D.'s license?
NPPES lists California license number A88414, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Yi Yi Stephanie Gu, M.D. prescribe under Medicare Part D?
In 2024, Yi Yi Stephanie Gu, M.D. had 1,511 Medicare Part D claims for 375 beneficiaries; the average among rheumatology physician prescribers was 1,978. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.