Frances Sun, M.D.
Geriatric Medicine (Family Medicine) Physician · San Jose, CA
Frances Sun, M.D. is a geriatric medicine (family medicine) physician with a practice address in San Jose, California, and NPI 1538245105, issued on Oct 27, 2006. Check the license (California G58850, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Frances Sun
- Credential
- M.D.
- Primary taxonomy
- Geriatric Medicine (Family Medicine) Physician 207QG0300X
- License number
- G58850 CA
Self-reported in NPPES; status is on the state search - Practice location
- 455 Oconnor Dr, San Jose, CA 95128
- Phone
- (408) 995-5453
- Enumerated
- Oct 27, 2006
- Record last updated
- Feb 16, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (408) 275-9442
- Entity
- Type 1 · individual
8 nearest geriatric medicine (family medicine) physician records → All 243 in California → Look up another NPI →
Also registered at 455 Oconnor Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Maricela Aguaristi, PHYSICIAN ASSISTANTPhysician Assistant1609059062
- Katharine Aldrich, CNMAdvanced Practice Midwife1790806388
- Annie Chern, M.D.Family Medicine Physician1104051507
- Alexandra Duisberg, MDStudent in an Organized Health Care Education/Training Program1255820635
- Michael Henehan, DOFamily Medicine Physician1053497685
- Robert Hsu, MPAS, PA-CPhysician Assistant1821168832
Verify Frances Sun in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G58850Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average geriatric medicine (family medicine) physician in 2024
87 Medicare Part D claims for 28 beneficiaries, against an average of 5,222 among the 1,271 providers of this specialty who prescribed in Part D.
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.
Frances Sun among 243 geriatric medicine (family medicine) physician records in California
Frances Sun, M.D. is one of 243 geriatric medicine (family medicine) physician records with a practice address in California. 76% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 53% newer
- In a Medicare fileYes · 76% of these records are
- In the CMS Doctors and Clinicians fileNo · 46% of these records are
- Record last updated2012 · 69% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207QG0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Geriatric Medicine (Family Medicine) Physician providers in California
There are 243 geriatric medicine (family medicine) physician records in California.
All 243 in California → Every provider in San Jose → Geriatric Medicine (Family Medicine) Physician nationwide →
The 8 geriatric medicine (family medicine) physician records with the nearest ZIP codes
- Elise Singer, MDSan Jose, CA 951281851497697
- Rakhi Yadav, M.DSan Jose, CA 951281215237276
- Alex Mirabadi, M.D.San Jose, CA 951261396037545
- Jeanine Phan, D.O.San Jose, CA 951191083994487
- Sidney Mitchell, MDWatsonville, CA 950761518027630
- Christopher O'Grady, M.D.Watsonville, CA 950761861474306
- Christian Negard, M.D.Santa Cruz, CA 950621356395826
- Jeffrey Brown, MDLos Gatos, CA 950301902815657
Common questions
What is Frances Sun, M.D.'s NPI number?
Frances Sun, M.D.'s National Provider Identifier (NPI) is 1538245105, issued on Oct 27, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Frances Sun, M.D. located?
The NPPES record lists a practice address at 455 Oconnor Dr, San Jose, CA, 95128. Phone: (408) 995-5453. Providers update this record themselves, so call before visiting.
How can I verify Frances Sun, M.D.'s license?
NPPES lists California license number G58850, 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 Frances Sun, M.D. prescribe under Medicare Part D?
In 2024, Frances Sun, M.D. had 87 Medicare Part D claims for 28 beneficiaries; the average among geriatric medicine (family medicine) physician prescribers was 5,222. 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.