Geoffrey Yuk Fung Tsoi, DO
Family Medicine Physician · Lancaster, CA
Geoffrey Yuk Fung Tsoi, DO is a family medicine physician with a practice address in Lancaster, California, and NPI 1497100606, issued on Apr 26, 2016. Check the license (California 20A17304, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Geoffrey Yuk Fung Tsoi
- Credential
- DO
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License numbers
- 20A17304 CA
341148 NY
Self-reported in NPPES; status is on the state search - Practice location
- 43322 Gingham Ave, Lancaster, CA 93535
- Phone
- (661) 874-4050
- Enumerated
- Apr 26, 2016
- Record last updated
- Mar 19, 2026
- Medicare enrollment
- Enrolled (PECOS I20191001002224); 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 43322 Gingham Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Araceli Cabalum, NPFamily Nurse Practitioner1689130718
- Kathlyn Mae De Los ReyesFamily Nurse Practitioner1730646456
- Therese Fonseca, FNPFamily Nurse Practitioner1902629348
Verify Geoffrey Yuk Fung Tsoi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A17304Check 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 family medicine physician in 2024
87 Medicare Part D claims for 57 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Most prescribed
- Paxlovid14 claims
- Albuterol Sulfate Hfa11 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
- Cedars-Sinai Medical Care FoundationBeverly Hills, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Geoffrey Yuk Fung Tsoi among 17,133 family medicine physician records in California
Geoffrey Yuk Fung Tsoi, DO 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 2016, is newer than 76% of them.
- NPI issued2016 · 76% of these records are older, 21% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2016 · median 2005 among the 10,652 with a school on file
- Record last updated2026 · 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).
45 family medicine physician records list a practice address in Lancaster
They are 45 of the 4,273 NPPES records with a practice address in Lancaster, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Lancaster → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Ryan Gorji, M.D.Lancaster, CA 935351619358272
- An Chih Hsieh, M.D., MPHLancaster, CA 935351356877377
- Miriam Nazmy, MDLancaster, CA 935351013274539
- Hoda Haydari Ahwazi, MDLancaster, CA 935341952980336
- Sambiz Amini, M.D.Lancaster, CA 935341720241961
- Veronica Espino De Mason, MDLancaster, CA 935341972426120
- Christine Zarah Garcia, MDLancaster, CA 935341659064491
- Julia Granese, FNPLancaster, CA 935341508433400
Common questions
What is Geoffrey Yuk Fung Tsoi, DO's NPI number?
Geoffrey Yuk Fung Tsoi, DO's National Provider Identifier (NPI) is 1497100606, issued on Apr 26, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Geoffrey Yuk Fung Tsoi, DO located?
The NPPES record lists a practice address at 43322 Gingham Ave, Lancaster, CA, 93535. Phone: (661) 874-4050. Providers update this record themselves, so call before visiting.
How can I verify Geoffrey Yuk Fung Tsoi, DO's license?
NPPES lists California license number 20A17304, 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 Geoffrey Yuk Fung Tsoi, DO prescribe under Medicare Part D?
In 2024, Geoffrey Yuk Fung Tsoi, DO had 87 Medicare Part D claims for 57 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.