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Dr. William J. Chang, MD
NPI1487732020
- Part D claims, 2021
- 17
- Publications
- 5
- Hospital affiliations
- 1
- Industry payments
- $39
- Medical group
- 1
- Practice address
- 3801 Miranda Avenue, Palo Alto, CA 94304
- Practice phone
- Call (650) 858-3939
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
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Dr. William J. Chang is an ophthalmologist in Palo Alto, California
Dr. Chang practices at Palo Alto VA Medical Center in Palo Alto, California, part of Veterans Health Administration.
Dr. Chang's NPI, 1487732020, was assigned on November 1, 2006. Dr. Chang graduated from George Washington University School of Medicine and Health Sciences in 1995. Dr. Chang holds California license G50770.
NPI and contact details
- NPI
- 1487732020NPI Registry (opens in a new tab)
- NPI enumeration date
- November 1, 2006
- NPI status
- Active
- Practice phone
- (650) 858-3939
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Medical school graduation
- 1995
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Dr. William J. Chang practices at Palo Alto VA Medical Center in Palo Alto, California
Dr. Chang's primary practice is Palo Alto VA Medical Center, at 3801 Miranda Avenue, Palo Alto, CA 94304 in Santa Clara County. The practice phone is (650) 858-3939.
- Palo Alto VA Medical Center3801 Miranda Avenue, Palo Alto, CA 94304 · Santa Clara CountyPhone(650) 858-3939
Source: Dmand AI Affiliation Data
Dr. William J. Chang is affiliated with 2 sites of care and 1 medical group
Dr. Chang's primary practice is Palo Alto VA Medical Center in Palo Alto, California, part of Veterans Health Administration. The medical group on file is The Permanente Medical Group, Inc. Dmand AI also links Dr. Chang to 1 more group practice or clinic, named with a free account. Dr. Chang's employer is on file too: a hospital.
The Permanente Medical Group, Inc.1 group practice or clinicName with a free accountEmployer: hospitalName with a free account
See all 3 affiliations for Dr. ChangSources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. William J. Chang's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chang practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Palo Alto VA Medical Center | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. William J. Chang is one of 2,621 ophthalmologists in California
Ophthalmology is Dr. Chang's primary specialty in the NPI Registry, under taxonomy code 207W00000X. Dr. Chang is board certified in ophthalmology by the American Board of Ophthalmology. Dr. Chang is licensed in California.
Specialties and state licenses
- Ophthalmology, CaliforniaPrimary
Ophthalmologists near Dr. Chang
Counts of ophthalmologists with a Dmand AI profile, by place and practice. Each opens the list.
2,621ophthalmologists in California34ophthalmologists in Palo Alto5ophthalmologists at Palo Alto VA Medical Center
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. William J. Chang's patients have a median age of 89
Across all payers, Dmand AI patient panel data puts Dr. Chang's median patient age at 89, with 67% women.
Dr. Chang's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 89
Patient panel by sex, all payers
- Women67%
- Men33%
Source: Dmand AI Patient Panel Data
Dr. William J. Chang wrote 17 Medicare Part D claims in 2021
In 2021, Dr. Chang wrote 17 Medicare Part D claims. Every claim was for a generic drug. They cover 1 drug, with $265 in total drug cost. In 2020, CMS named 228 claims across 8 drugs.
Part D claims, 202117
Drugs named by CMS1
Total drug cost$265
Dr. Chang's most prescribed drugs by claims, 2021
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2020 to 2021
- 2020
- 2021
- Claims for drugs CMS names
- 2020: 2282021: 1793%
Drugs named by CMS: 1 in 2021, 8 in 2020.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
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Dr. William J. Chang has 5 publications on record
Dmand AI links 5 papers to Dr. Chang, published from 2015 to 2023. The most frequent topics are Anti-Bacterial Agents, Antibiotic Prophylaxis and Biometry. Dr. Chang has published most often in Ophthalmology. Dr. Chang's most frequent co-authors are Ronald B. Melles, MD, Matthew C. Carnahan, MD and Donald S. Fong, MD.
Papers5
Years published2015 to 2023
Dr. Chang's papers by year, 2015 to 2023
Topics Dr. Chang writes about most
- Anti-Bacterial Agents
- Antibiotic Prophylaxis
- Biometry
- Endophthalmitis
- Eye Infections, Bacterial
- Lenses, Intraocular
- Optics and Photonics
- Phacoemulsification
Dr. Chang's most frequent co-authors
- Ronald B. Melles, MD3 shared papers
- Matthew C. Carnahan, MD1 shared paper
- Donald S. Fong, MD1 shared paper
Recent publications by Dr. Chang
BiometryCataract ExtractionLenses, Intraocular
BiometryHyperopiaLenses, Intraocular
Ophthalmology
Administration, TopicalAminoglycosidesAnti-Bacterial Agents
J Cataract Refract Surg
Anterior Eye SegmentAnti-Bacterial AgentsAntibiotic Prophylaxis
See who Dr. Chang researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Chang works with, so you can find a warm path to the right ophthalmologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. William J. Chang received $39 in industry payments in 2023
CMS Open Payments shows 2 general payments to Dr. Chang from 1 drug or device company in 2023. Food and beverage make up the largest share, 100% of the total. Alcon Laboratories Inc paid the most, $39.
Companies that paid Dr. Chang the most, 2023 to 2023
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. William J. Chang graduated from George Washington University School of Medicine and Health Sciences
Dr. Chang graduated from George Washington University School of Medicine and Health Sciences in 1995.
- Medical school
- Board certified in ophthalmology
Source: Dmand AI Professional Profile Data
Sources for Dr. William J. Chang's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. William J. Chang
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. William J. Chang's NPI number?
Dr. William J. Chang's NPI number is 1487732020. It was assigned on November 1, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. William J. Chang?
Dr. William J. Chang is an ophthalmologist in Palo Alto, California. The primary specialty in the NPI Registry is Ophthalmology Physician (taxonomy code 207W00000X).
Where does Dr. William J. Chang practice?
Dr. Chang practices at 3801 Miranda Avenue, Palo Alto, CA 94304. Dr. Chang's primary practice is Palo Alto VA Medical Center in Palo Alto, California, part of Veterans Health Administration. Dmand AI also links Dr. Chang to 1 group practice or clinic.
What is Dr. William J. Chang's office phone number?
The practice phone on file for Dr. Chang is (650) 858-3939.
What is Dr. William J. Chang's medical license number?
Dr. Chang holds California license G50770.
Which hospitals is Dr. William J. Chang affiliated with?
Dr. Chang practices at Palo Alto VA Medical Center in Palo Alto, California.
What medical group is Dr. William J. Chang part of?
Dr. Chang is linked to The Permanente Medical Group, Inc.
Is Dr. William J. Chang board certified?
Yes. Dr. Chang is board certified in ophthalmology by the American Board of Ophthalmology.
Where did Dr. William J. Chang go to medical school?
Dr. Chang graduated from George Washington University School of Medicine and Health Sciences in 1995.
What drugs does Dr. William J. Chang prescribe most?
In 2021 Medicare Part D data, Dr. Chang's most prescribed drugs by claims were Latanoprost.
Show 4 more questionsShow fewer questions
Has Dr. William J. Chang received payments from drug or device companies?
CMS Open Payments shows $39 in general payments to Dr. Chang from 1 company from 2023 to 2023. The largest total came from Alcon Laboratories Inc.
How long has Dr. William J. Chang been practicing?
Dr. Chang graduated from medical school in 1995, 31 years ago.
Does Dr. William J. Chang do research?
Dmand AI links 5 publications to Dr. Chang, published from 2015 to 2023.
Who does Dr. William J. Chang publish with?
Dr. Chang's most frequent co-authors are Ronald B. Melles, MD (3 shared papers), Matthew C. Carnahan, MD (1 shared paper) and Donald S. Fong, MD (1 shared paper).
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