Rudolph M. Chang, D.O.
Family Medicine Physician · Union City, CA
Rudolph M. Chang, D.O. is a family medicine physician with a practice address in Union City, California, and NPI 1376835595, issued on May 5, 2011. Check the license (California 20A11580, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Rudolph M. Chang
- Credential
- D.O.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 20A11580 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3553 Whipple RD, Union City, CA 94587
- Phone
- (510) 454-1000
- Enumerated
- May 5, 2011
- Record last updated
- Feb 11, 2022
- Medicare enrollment
- Enrolled (PECOS I20121212000012); accepts Medicare assignment
- Medical or professional school
- College Of Osteo Med Of The Pacific At Pomona, 2009
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 3553 Whipple RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Rudolph M. Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A11580Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% more Medicare Part D claims than the average family medicine physician in 2024
6,971 Medicare Part D claims for 1,228 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D. Brand-name drugs were 10% of claims. 429 claims were for opioids.
Most prescribed
- Atorvastatin Calcium422 claims
- Amlodipine Besylate308 claims
- Hydrocodone-Acetaminophen258 claims
- Losartan Potassium227 claims
- Famotidine198 claims
- Atenolol170 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.
Industry payments in 2024: $24.32
1 payment: food and beverage; the largest payer was Dexcom, Inc. The 55,478 providers of this specialty with any payment received $902.55 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Permanente Medical Group IncStockton, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Rudolph M. Chang among 17,133 family medicine physician records in California
Rudolph M. Chang, D.O. 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 2011, is newer than 63% of them.
- NPI issued2011 · 63% of these records are older, 34% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 62% of these records are
- Graduated2009 · median 2005 among the 10,652 with a school on file
- Record last updated2022 · 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).
19 family medicine physician records list a practice address in Union City
They are 19 of the 1,006 NPPES records with a practice address in Union City, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Union City → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Antonina Bondyasheva, M.D.Union City, CA 945871194982462
- Matthew Eisley, M.D.Union City, CA 945871689810483
- Lynda Kay, M.D.Union City, CA 945871740320183
- Kawalpreet Manku, M.D.Union City, CA 945871851406466
- Abraham Mohmand, M.D.Union City, CA 945871982995494
- Diana Mokaya, M.D.Union City, CA 945871023458528
- Son Lam Nguyen, D.O.Union City, CA 945871093851768
- Tam Nguyen, M.D.Union City, CA 945871093929697
Common questions
What is Rudolph M. Chang, D.O.'s NPI number?
Rudolph M. Chang, D.O.'s National Provider Identifier (NPI) is 1376835595, issued on May 5, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Rudolph M. Chang, D.O. located?
The NPPES record lists a practice address at 3553 Whipple RD, Union City, CA, 94587. Phone: (510) 454-1000. Providers update this record themselves, so call before visiting.
How can I verify Rudolph M. Chang, D.O.'s license?
NPPES lists California license number 20A11580, 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 Rudolph M. Chang, D.O. prescribe under Medicare Part D?
In 2024, Rudolph M. Chang, D.O. had 6,971 Medicare Part D claims for 1,228 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.