Timothy Patrick Ong, MD
Internal Medicine Physician · San Jose, CA
Timothy Patrick Ong, MD is an internal medicine physician with a practice address in San Jose, California, and NPI 1033125075, issued on Jul 31, 2006. Check the license (California G80475, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Timothy Patrick Ong
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- G80475 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2400 Moorpark Ave, San Jose, CA 95128
- Phone
- (408) 885-5000
- Enumerated
- Jul 31, 2006
- Record last updated
- Feb 27, 2012 (not updated in 14 years: call before relying on the address or phone)
- Fax
- (408) 885-3335
- Medicaid ID
- 00G804750 CA
- Medicare enrollment
- Enrolled (PECOS I20090130000511); accepts Medicare assignment
- Medical or professional school
- University Of California, San Francisco School Of Medicine, 1993
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 17,696 in California → Look up another NPI →
Also registered at 2400 Moorpark Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Senait AbrahaCase Manager/Care Coordinator1609152156
- Lalitha AcharyaMental Health Counselor1891928149
- Jamal AdamCase Manager/Care Coordinator1285910836
- Y Klong Adrong, MHCMental Health Counselor1871633180
- Sheilah Altomare, M.S., R.D.Registered Dietitian1740512912
- Evanthia Antonakopoulou, RN, PHN, NPRegistered Nurse1073945903
Verify Timothy Patrick Ong in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G80475Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
3.4 times the Medicare Part D claims of the average internal medicine physician in 2024
10,648 Medicare Part D claims for 640 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims. 604 claims were for opioids.
Most prescribed
- Atorvastatin Calcium654 claims
- Amlodipine Besylate564 claims
- Metformin Hcl428 claims
- Hydrocodone-Acetaminophen369 claims
- Omeprazole325 claims
- Losartan Potassium274 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.
The practice group's MIPS final score for 2023 (Medicare payment program): 80.6 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- County OF Santa ClaraSan Jose, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Timothy Patrick Ong among 17,696 internal medicine physician records in California
Timothy Patrick Ong, MD is one of 17,696 internal medicine physician records with a practice address in California. 79% 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 5% of them.
- NPI issued2006 · 5% of these records are older, 56% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 63% of these records are
- Graduated1993 · median 2004 among the 11,065 with a school on file
- Record last updated2012 · 61% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
428 internal medicine physician records list a practice address in San Jose
They are 428 of the 20,925 NPPES records with a practice address in San Jose, and 17,696 internal medicine physician records in California.
All 17,696 in California → Every provider in San Jose → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Alfonso Banuelos, MDSan Jose, CA 951281295720613
- Kimberly Bazar, MDSan Jose, CA 951281447225206
- Andrea Cervenka, MDSan Jose, CA 951281609841774
- Stephanie Chan, MDSan Jose, CA 951281639144538
- Alexander Chyorny, MDSan Jose, CA 951281750358016
- Sarah Cody, MDSan Jose, CA 951281568425437
- Vijaya Dudyala, M.DSan Jose, CA 951281477522589
- Eamonn Dunphy, MDSan Jose, CA 951281003878182
Common questions
What is Timothy Patrick Ong, MD's NPI number?
Timothy Patrick Ong, MD's National Provider Identifier (NPI) is 1033125075, issued on Jul 31, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Timothy Patrick Ong, MD located?
The NPPES record lists a practice address at 2400 Moorpark Ave, San Jose, CA, 95128. Phone: (408) 885-5000. Providers update this record themselves, so call before visiting.
How can I verify Timothy Patrick Ong, MD's license?
NPPES lists California license number G80475, 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 Timothy Patrick Ong, MD prescribe under Medicare Part D?
In 2024, Timothy Patrick Ong, MD had 10,648 Medicare Part D claims for 640 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
What is Timothy Patrick Ong, MD's MIPS final score?
The 2023 MIPS final score is 80.6 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.