William Chang, OD
- Part D claims, 2024
- 29
- Industry payments
- $791
- Affiliated sites
- 1
- Medical group
- 1
- State license
- 1
- Practice address
- 417 S San Gabriel Blvd, San Gabriel, CA 91776
- Practice phone
- Call (626) 291-2020
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
William Chang OD, Inc
San Gabriel, California
Find William Chang's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
William Chang is an optometrist in San Gabriel, California
William Chang practices at William Chang OD, Inc in San Gabriel, California.
William Chang's NPI, 1629206834, was assigned on June 25, 2009. William Chang holds California license TLG13713.
- NPI
- 1629206834NPI Registry (opens in a new tab)
- NPI enumeration date
- June 25, 2009
- NPI status
- Active
- Practice phone
- (626) 291-2020
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
William Chang practices at William Chang OD, Inc in San Gabriel, California
William Chang's primary practice is William Chang OD, Inc, at 417 S San Gabriel Blvd, San Gabriel, CA 91776 in Los Angeles County. The practice phone is (626) 291-2020.
- William Chang OD, Inc417 S San Gabriel Blvd, San Gabriel, CA 91776 · Los Angeles CountyPhone(626) 291-2020
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
William Chang is affiliated with 2 sites of care and 1 medical group
William Chang's primary practice is William Chang OD, Inc in San Gabriel, California. Dmand AI also links William Chang to 1 group practice or clinic and 1 medical group, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at William Chang's practice
Dmand AI tracks the electronic health record (EHR) system at each site where William Chang practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| William Chang OD, Inc | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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William Chang is one of 7,206 optometrists in California
Optometrist is William Chang's primary specialty in the NPI Registry, under taxonomy code 152W00000X. William Chang is licensed in California.
Specialties and state licenses
- Optometrist, CaliforniaPrimary
Optometrists near William Chang
Counts of optometrists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
William Chang's patients have a median age of 67
Across all payers, Dmand AI patient panel data puts William Chang's median patient age at 67, with 52% women.
William 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 67
Patient panel by sex, all payers
- Women52%
- Men47%
Source: Dmand AI Patient Panel Data
William Chang wrote 29 Medicare Part D claims in 2024
In 2024, William Chang wrote 29 Medicare Part D claims. 59% of them were for generic drugs.
William Chang's Part D claims by kind of drug, 2024
- Generic17 claims59%
- Brand-name12 claims41%
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
For MedTech and pharma teams
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William Chang received $791 in industry payments in 2025
CMS Open Payments shows 6 general payments to William Chang from 3 drug and device companies in 2025. Travel and lodging make up the largest share, 70% of the total. Alcon Laboratories Inc paid the most, $550.
General payments to William Chang by kind, 2025 to 2025
- Travel and lodging$55070%
- Food and beverage$24130%
Companies that paid William Chang the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for William 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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| Part D prescribing | Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| 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 William 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 William Chang's NPI number?
William Chang's NPI number is 1629206834. It was assigned on June 25, 2009, and it is active in the NPI Registry.
What does William Chang specialize in?
William Chang is an optometrist in San Gabriel, California. The primary specialty in the NPI Registry is Optometrist (taxonomy code 152W00000X).
Where does William Chang practice?
William Chang practices at 417 S San Gabriel Blvd, San Gabriel, CA 91776. William Chang's primary practice is William Chang OD, Inc in San Gabriel, California. Dmand AI also links William Chang to 1 group practice or clinic and 1 medical group.
What is William Chang's office phone number?
The practice phone on file for William Chang is (626) 291-2020.
What is William Chang's medical license number?
William Chang holds California license TLG13713.
Has William Chang received payments from drug or device companies?
CMS Open Payments shows $791 in general payments to William Chang from 3 companies from 2025 to 2025. The largest total came from Alcon Laboratories Inc.
How long has William Chang been practicing?
William Chang's NPI was assigned in 2009.
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