Gene-Yuan Chang, MD
Nephrology Physician · Castro Valley, CA
Gene-Yuan Chang, MD is a nephrology physician with a practice address in Castro Valley, California, and NPI 1467731828, issued on Aug 16, 2011. Check the license (California 121677, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Gene-Yuan Chang
- Credential
- MD
- Primary taxonomy
- Nephrology Physician 207RN0300X
- License number
- 121677 CA
Self-reported in NPPES; status is on the state search - Practice location
- 19850 Lake Chabot RD, Castro Valley, CA 94546
- Phone
- (510) 881-1490
- Enumerated
- Aug 16, 2011
- Record last updated
- Apr 25, 2025
- Medicare enrollment
- Enrolled (PECOS I20150915000451); accepts Medicare assignment
- Medical or professional school
- Boston University School Of Medicine, 2009
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest nephrology physician records → All 1,468 in California → Look up another NPI →
Also registered at 19850 Lake Chabot RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Joann Dumas, FNPRegistered Nurse1902987126
- Isaac Ibrahimi, PA-CPhysician Assistant1588735849
- Vineetha Rangarajan, DONephrology Physician1295363752
- Kathryn Welty, MDNephrology Physician1740476761
Verify Gene-Yuan Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 121677Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
38% more Medicare Part D claims than the average nephrology physician in 2024
2,018 Medicare Part D claims for 202 beneficiaries, against an average of 1,465 among the 10,986 providers of this specialty who prescribed in Part D. Brand-name drugs were 14% of claims.
Most prescribed
- Bumetanide113 claims
- Carvedilol108 claims
- Lisinopril98 claims
- Furosemide95 claims
- Amlodipine Besylate84 claims
- Hydralazine Hcl77 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: $710.93
30 payments; by number, the most common kind was food and beverage; the largest payer was Amgen Inc. The 8,230 providers of this specialty with any payment received $3,091.37 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
- West Coast KidneySan Leandro, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Gene-Yuan Chang among 1,468 nephrology physician records in California
Gene-Yuan Chang, MD is one of 1,468 nephrology physician records with a practice address in California. 88% 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 76% of them.
- NPI issued2011 · 76% of these records are older, 20% newer
- In a Medicare fileYes · 88% of these records are
- In the CMS Doctors and Clinicians fileYes · 77% of these records are
- Graduated2009 · median 2001 among the 1,128 with a school on file
- Record last updated2025 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RN0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Nephrology Physician providers in California
There are 1,468 nephrology physician records in California.
All 1,468 in California → Every provider in Castro Valley → Nephrology Physician nationwide →
The 8 nephrology physician records with the nearest ZIP codes
- Archana Aggarwal, M.D.Castro Valley 94546, CA 945461326024084
- Vineetha Rangarajan, DOCastro Valley, CA 945461295363752
- Rahul Rishi, M.D.Castro Valley, CA 945461740243930
- Kathryn Welty, MDCastro Valley, CA 945461740476761
- Mario Bernaba, MDHayward, CA 945451205499506
- Neelam Bhalla, M.D.Hayward, CA 945451639118052
- Sarasa Kimata, M.D.Hayward, CA 945451477631232
- George Lai, M.D.Hayward, CA 945451043398803
Common questions
What is Gene-Yuan Chang, MD's NPI number?
Gene-Yuan Chang, MD's National Provider Identifier (NPI) is 1467731828, issued on Aug 16, 2011. An NPI identifies a provider in billing; it is not a license.
Where is Gene-Yuan Chang, MD located?
The NPPES record lists a practice address at 19850 Lake Chabot RD, Castro Valley, CA, 94546. Phone: (510) 881-1490. Providers update this record themselves, so call before visiting.
How can I verify Gene-Yuan Chang, MD's license?
NPPES lists California license number 121677, 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 Gene-Yuan Chang, MD prescribe under Medicare Part D?
In 2024, Gene-Yuan Chang, MD had 2,018 Medicare Part D claims for 202 beneficiaries; the average among nephrology physician prescribers was 1,465. 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.