Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Timothy Patrick Ong, MD

Individual provider Internal Medicine Physician · NPI 1033125075

Timothy Patrick Ong, MD practises Internal Medicine in San Jose, California. Graduated from University of California, San Francisco School of Medicine in 1993, 33 years ago. Practices with County of Santa Clara, a 993-clinician group and accepts Medicare assignment. Licensed in California.

Years since qualifying
33
Trained at
University of California, San Francisco School of Medicine
Licensed in
CA
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Claim this listing Report a problem Suggest an edit

Practice location Address checks out

2400 Moorpark Ave Vhc Moorpark Internal Medicine Clinic
San Jose, CA 95128-2631 Not confirmed with CMS for 14 years — call before visiting
Phone: (408) 885-5000
Fax: (408) 885-3335
Show map & directions

Directions in Google Maps · Apple Maps · OpenStreetMap

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence G80475 (CA)

Record details

NPI number1033125075
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 31, 2006
Last updated in NPPESFebruary 27, 2012

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolUNIVERSITY OF CALIFORNIA, SAN FRANCISCO SCHOOL OF MEDICINE
Graduated 1993 (33 years in practice)
Group practice County Of Santa Clara — 993 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients66
Services billed 107 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at County of Santa Clara

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 993 clinicians in the practice; 12 are shown here.

Other providers in San Jose