Nelson Yoium-Tsiu Chang, MD
Family Medicine Physician · Tracy, CA
Nelson Yoium-Tsiu Chang, MD is a family medicine physician with a practice address in Tracy, California, and NPI 1689316648, issued on Apr 11, 2022. Check the license (California A190393, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Nelson Yoium-Tsiu Chang
- Credential
- MD
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- A190393 CA
Self-reported in NPPES; status is on the state search - Practice location
- 2151 W Grant Line RD, Tracy, CA 95377
- Phone
- (209) 373-2816
- Enumerated
- Apr 11, 2022
- Record last updated
- May 27, 2026
- Fax
- (209) 373-2873
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 17,133 in California → Look up another NPI →
Also registered at 2151 W Grant Line RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Minaleshoa Abye, M.DPediatrics Physician1700025780
- Dunni Adalumo, M.D.Family Medicine Physician1447578331
- Melanie Deschine, ASWClinical Social Worker1356802482
- Christopher Fossaceca, MDAnesthesiology Physician1295817880
- James Halderman, M.D.Anesthesiology Physician1679514012
- Sydney Hansen, MS, RDRegistered Dietitian1295200061
Verify Nelson Yoium-Tsiu Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A190393Check 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
58 Medicare Part D claims for 25 beneficiaries, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
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.
Nelson Yoium-Tsiu Chang among 17,133 family medicine physician records in California
Nelson Yoium-Tsiu Chang, 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 2022, is newer than 94% of them.
- NPI issued2022 · 94% of these records are older, 3% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileNo · 62% of these records are
- 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).
35 family medicine physician records list a practice address in Tracy
They are 35 of the 1,864 NPPES records with a practice address in Tracy, and 17,133 family medicine physician records in California.
All 17,133 in California → Every provider in Tracy → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Gina Adair, M.D.Tracy, CA 953771619930179
- Dunni Adalumo, M.D.Tracy, CA 953771447578331
- Al Khan Alsua, M.D.Tracy, CA 953771790927747
- Maria Bugay, MDTracy, CA 953771841342649
- Meiling Chiang, MDTracy, CA 953771750433553
- Anale Cunningham, MDTracy, CA 953771639229438
- Manorie Ekanayake, M.DTracy, CA 953771912176884
- Sidhartha Gurung, MDTracy, CA 953771720166267
Common questions
What is Nelson Yoium-Tsiu Chang, MD's NPI number?
Nelson Yoium-Tsiu Chang, MD's National Provider Identifier (NPI) is 1689316648, issued on Apr 11, 2022. An NPI identifies a provider in billing; it is not a license.
Where is Nelson Yoium-Tsiu Chang, MD located?
The NPPES record lists a practice address at 2151 W Grant Line RD, Tracy, CA, 95377. Phone: (209) 373-2816. Providers update this record themselves, so call before visiting.
How can I verify Nelson Yoium-Tsiu Chang, MD's license?
NPPES lists California license number A190393, 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 Nelson Yoium-Tsiu Chang, MD prescribe under Medicare Part D?
In 2024, Nelson Yoium-Tsiu Chang, MD had 58 Medicare Part D claims for 25 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.