Frances Xu, MD
Family Medicine Physician · San Mateo, CA
Frances Xu, MD is a family medicine physician with a practice address in San Mateo, California, and NPI 1588161624, issued on Apr 6, 2018. Check the license (California A165683, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Frances Xu
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A165683 CA
Self-reported in NPPES; status is on the state search - Practice location
- 50 S San Mateo Dr, San Mateo, CA 94401
- Phone
- (650) 652-7044
- Enumerated
- Apr 6, 2018
- Record last updated
- Aug 25, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20210831002586); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 50 S San Mateo Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Hayley Brown, MS, RN, FNP-CFamily Nurse Practitioner1518395169
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Verify Frances Xu in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A165683Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
42% fewer Medicare Part D claims than the average family medicine physician in 2024
2,050 Medicare Part D claims for 282 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 55 claims were for opioids.
Most prescribed
- Atorvastatin Calcium169 claims
- Amlodipine Besylate109 claims
- Levothyroxine Sodium106 claims
- Losartan Potassium87 claims
- Lisinopril75 claims
- Alendronate Sodium61 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
- Sutter Bay Medical FoundationSan Francisco, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Frances Xu among 17,133 family medicine physician records in California
Frances Xu, MD is one of 17,133 family medicine 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 2018, is newer than 82% of them.
- NPI issued2018 · 82% of these records are older, 15% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2018 · median 2005 among the 10,652 with a school on file
- Record last updated2021 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
39 family medicine physician records list a practice address in San Mateo
They are 39 of the 3,909 NPPES records with a practice address in San Mateo, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in San Mateo → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Frederick Adler, M.D.San Mateo, CA 944011629030515
- Mandeep Bajwa, M.D.San Mateo, CA 944011891083978
- Lilly Chavez, NPSan Mateo, CA 944011609417567
- Marlon Echaverry, MDSan Mateo, CA 944011992266654
- Jeanine GoreSan Mateo, CA 944011730592148
- Masayasu Kihira, MD PHDSan Mateo, CA 944011851358071
- Ann Marie Miller, MDSan Mateo, CA 944011972655090
- Alexander Moldanado, M.D.San Mateo, CA 944011184617136
Common questions
What is Frances Xu, MD's NPI number?
Frances Xu, MD's National Provider Identifier (NPI) is 1588161624, issued on Apr 6, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Frances Xu, MD located?
The NPPES record lists a practice address at 50 S San Mateo Dr, San Mateo, CA, 94401. Phone: (650) 652-7044. Providers update this record themselves, so call before visiting.
How can I verify Frances Xu, MD's license?
NPPES lists California license number A165683, 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 Xu, MD prescribe under Medicare Part D?
In 2024, Frances Xu, MD had 2,050 Medicare Part D claims for 282 beneficiaries; the average among family medicine physician prescribers was 3,544. 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.