Gene Chang, OD
- Part D claims, 2024
- 31
- Hospital affiliations
- 1
- Industry payments
- $121
- Medical group
- 1
- State license
- 1
- Practice address
- 25825 South Vermont Avenue, Harbor City, CA 90710
- Practice phone
- Call (310) 325-5111
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Gene 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.
Gene Chang is an optometrist in Harbor City, California
Gene Chang practices at Kaiser Permanente South Bay Medical Center in Harbor City, California, part of Kaiser Permanente.
Gene Chang's NPI, 1174671093, was assigned on January 8, 2007. Gene Chang graduated from New England College of Optometry in 2003. Gene Chang holds California license OPT12421.
- NPI
- 1174671093NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0547215535
- NPI enumeration date
- January 8, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (310) 325-5111
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 49
- Medical school graduation
- 2003
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Gene Chang practices at Kaiser Permanente South Bay Medical Center in Harbor City, California
Gene Chang's primary practice is Kaiser Permanente South Bay Medical Center, at 25825 South Vermont Avenue, Harbor City, CA 90710 in Los Angeles County. The practice phone is (310) 325-5111.
- Kaiser Permanente South Bay Medical Center25825 South Vermont Avenue, Harbor City, CA 90710 · Los Angeles CountyPhone(310) 325-5111
Source: Dmand AI Affiliation Data
Gene Chang is affiliated with 1 site of care and 1 medical group
Gene Chang's primary practice is Kaiser Permanente South Bay Medical Center in Harbor City, California, part of Kaiser Permanente. The medical group on file is Southern California Permanente Medical Group.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Gene Chang's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Gene Chang practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Kaiser Permanente South Bay Medical Center | Available with a free account |
Source: Dmand AI Technology Install Data
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Gene Chang is one of 7,206 optometrists in California
Optometrist is Gene Chang's primary specialty in the NPI Registry, under taxonomy code 152W00000X. Gene Chang is licensed in California.
Specialties and state licenses
- Optometrist, CaliforniaPrimary
Optometrists near Gene 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
Gene Chang's patients have a median age of 52
Across all payers, Dmand AI patient panel data puts Gene Chang's median patient age at 52, with 61% women.
Gene 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 52
Patient panel by sex, all payers
- Women61%
- Men38%
Source: Dmand AI Patient Panel Data
Gene Chang wrote 31 Medicare Part D claims in 2024
In 2024, Gene Chang wrote 31 Medicare Part D claims. 94% of them were for generic drugs.
Gene Chang's Part D claims by kind of drug, 2024
- Generic29 claims94%
- Brand-name and other2 claims6%
Source: Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Gene Chang takes part in Medicare
Gene Chang accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
For MedTech and pharma teams
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Gene Chang received $121 in industry payments in 2025
CMS Open Payments shows 1 general payment to Gene Chang from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Alcon Laboratories Inc paid the most, $121.
Companies that paid Gene 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
Gene Chang graduated from New England College of Optometry
Gene Chang graduated from New England College of Optometry in 2003.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Gene 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 (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| 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 Gene 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 Gene Chang's NPI number?
Gene Chang's NPI number is 1174671093. It was assigned on January 8, 2007, and it is active in the NPI Registry.
What does Gene Chang specialize in?
Gene Chang is an optometrist in Harbor City, California. The primary specialty in the NPI Registry is Optometrist (taxonomy code 152W00000X).
Where does Gene Chang practice?
Gene Chang practices at 25825 South Vermont Avenue, Harbor City, CA 90710. Gene Chang's primary practice is Kaiser Permanente South Bay Medical Center in Harbor City, California, part of Kaiser Permanente.
What is Gene Chang's office phone number?
The practice phone on file for Gene Chang is (310) 325-5111.
What is Gene Chang's medical license number?
Gene Chang holds California license OPT12421.
Which hospitals is Gene Chang affiliated with?
Gene Chang practices at Kaiser Permanente South Bay Medical Center in Harbor City, California.
What medical group is Gene Chang part of?
Gene Chang is linked to Southern California Permanente Medical Group.
Does Gene Chang accept Medicare?
Yes. CMS lists Gene Chang as accepting Medicare assignment.
Where did Gene Chang go to medical school?
Gene Chang graduated from New England College of Optometry in 2003.
Has Gene Chang received payments from drug or device companies?
CMS Open Payments shows $121 in general payments to Gene Chang from 1 company from 2025 to 2025. The largest total came from Alcon Laboratories Inc.
How long has Gene Chang been practicing?
Gene Chang graduated from medical school in 2003, 23 years ago.
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