$2,393 in research paymentsIntravitreal aflibercept injection [IAI]Sham
Dr. Eugene Y. Chang, MD
NPI1265432991PAC ID3375514383
- Medicare services, 2020
- 13
- Part D claims, 2024
- 4,014
- Publications
- 1
- Clinical trials
- 1
- Industry payments
- $16,618
- Practice address
- 2619 E Colorado Blvd, Pasadena, CA 91107
- Practice phone
- Call (626) 793-4168
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
California Eye Specialists Medical Group Inc
Pasadena, California
Find Dr. Chang's professional email, personal email and mobile number
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Dr. Eugene Y. Chang is a retina specialist (ophthalmology) physician in Pasadena, California
Dr. Chang practices at California Eye Specialists Medical Group Inc in Pasadena, California.
Dr. Chang's NPI, 1265432991, was assigned on July 22, 2005. Dr. Chang graduated from Tufts University School Of Medicine in 2000. Dr. Chang holds California license A77825.
NPI and contact details
- NPI
- 1265432991NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3375514383
- NPI enumeration date
- July 22, 2005
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (626) 793-4168
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 52
- Medical school graduation
- 2000
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Eugene Y. Chang practices at California Eye Specialists Medical Group Inc in Pasadena, California
Dr. Chang's primary practice is California Eye Specialists Medical Group Inc, at 2619 E Colorado Blvd, Pasadena, CA 91107 in Los Angeles County. The practice phone is (626) 793-4168.
- California Eye Specialists Medical Group Inc2619 E Colorado Blvd, Pasadena, CA 91107 · Los Angeles CountyPhone(626) 793-4168
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Eugene Y. Chang is affiliated with 6 sites of care and 7 medical groups
Dr. Chang's primary practice is California Eye Specialists Medical Group Inc in Pasadena, California. Dmand AI also links Dr. Chang to 7 medical groups and 5 group practices and clinics, each named with a free account.
California Eye Specialists Medical Group IncPrimary
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Eugene Y. Chang's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chang practices, 5 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| California Eye Specialists Medical Group Inc | Available with a free account |
| +5 more sites and 7 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Eugene Y. Chang is one of 183 retina specialist (ophthalmology) physicians in California
Retina specialist is Dr. Chang's primary specialty in the NPI Registry, under taxonomy code 207WX0107X. Dr. Chang is board certified in ophthalmology by the American Board of Ophthalmology. Dmand AI has Dr. Chang's licenses on file in 3 states: California, Oregon and Illinois.
Specialties and state licenses
- Retina specialist (ophthalmology), CaliforniaPrimary
- Oregon license
- Ophthalmology, Illinois
Clinical focus
Dmand AI lists surgical retina and vitreous procedures among the conditions Dr. Chang treats.
Retina specialist (ophthalmology) physicians near Dr. Chang
Counts of retina specialist (ophthalmology) physicians with a Dmand AI profile, by place and practice. Each opens the list.
183retina specialist (ophthalmology) physicians in California
6retina specialist (ophthalmology) physicians in Pasadena
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Eugene Y. Chang billed Medicare for 13 services in 2020
CMS data shows 13 Medicare services from Dr. Chang across 1 procedure code in 2020. Medicare paid $329 for them. Every service was in an office.
Medicare services, 202013
Paid by Medicare$329
Procedure codes1
Dr. Chang's Medicare services by type, 2019 to 2020
- 2019
- 2020
- Tests and treatments
- 2019: 1,2102020: 1399%
- Drugs given in the office
- 2019: 4202020: 0100%
- Surgery
- 2019: 3522020: 0100%
Dr. Chang compared with the California median for retina specialist (ophthalmology) physicians, 2020
- Dr. Chang
- California median
- Medicare services
- 13vs 8,796100% below
- Part D claims
- 3,941vs 32012.3 times
Medians across 180 retina specialist (ophthalmology) physicians in California with Dmand AI profiles that report each measure.
Dr. Chang's most billed Medicare procedure codes, 2020
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Chang?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Chang and other retina specialist (ophthalmology) physicians in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Eugene Y. Chang's patients have a median age of 70
Across all payers, Dmand AI patient panel data puts Dr. Chang's median patient age at 70, with 52% 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 70
Patient panel by sex, all payers
- Women52%
- Men48%
Source: Dmand AI Patient Panel Data
Dr. Eugene Y. Chang wrote 4,014 Medicare Part D claims in 2024
In 2024, Dr. Chang wrote 4,014 Medicare Part D claims for 874 patients. 68% of them were for generic drugs. CMS names the drug for 3,941 of them, across 30 drugs with 11 or more claims each, at $270,962 in total drug cost. In 2023, CMS named 4,114 claims across 27 drugs.
Part D claims, 20244,014
Drugs named by CMS30
Total drug cost$270,962
Part D patients874
Dr. Chang's Part D claims by kind of drug, 2024
- Generic2,727 claims68%
- Brand-name and other1,287 claims32%
Dr. Chang's most prescribed drugs by claims, 2024
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, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 4,1142024: 3,9414%
Drugs named by CMS: 30 in 2024, 27 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Eugene Y. Chang takes part in Medicare
Dr. Chang accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Cataract surgery: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Eugene Y. Chang has 1 publication on record
Dmand AI links 1 paper to Dr. Chang in 2012.
Papers1
Recent publications by Dr. Chang
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 retina specialist (ophthalmology) physicians.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Eugene Y. Chang has worked on 1 clinical trial
Dmand AI links Dr. Chang to 1 clinical trial. Open Payments lists research payments to Dr. Chang that name 1 trial.
Investigators on the most trials with Dr. Chang
- Joseph D. Benevento, MD1 shared trial
- Brian B. Berger, MD1 shared trial
- David S. Boyer, MD1 shared trial
Recent clinical trials with Dr. Chang
Sources: Open Payments (CMS), 2025 data, released July 7, 2026; Dmand AI Research Linkage; and ClinicalTrials.gov (National Library of Medicine)
Dr. Eugene Y. Chang received $16,618 in industry payments from 2016 to 2025
CMS Open Payments shows 177 general payments to Dr. Chang from 33 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 60% of the total. Allergan Inc. paid the most, $3,831. It also lists 11 research payments totaling $11,993 from 2017 to 2025, naming 1 clinical trial.
General payments to Dr. Chang by program year, 2016 to 2025
General payments to Dr. Chang by kind, 2016 to 2025
$16.6Kin total
- Food and beverage$9,99260%
- Speaker and faculty fees$2,85017%
- Consulting fees$2,50015%
- Travel and lodging$1,0426%
- Other$2341%
Companies that paid Dr. Chang the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Eugene Y. Chang graduated from Tufts University School Of Medicine
Dr. Chang graduated from Tufts University School Of Medicine in 2000.
- Medical school
- Board certified in ophthalmology
Source: Dmand AI Professional Profile Data
Dr. Eugene Y. Chang accepts plans from 20 insurance carriers
Dr. Chang is in network with 20 carriers, including Aetna, Blue Cross Blue Shield of Michigan and HCSC. HMO plans come from the most carriers, 14. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- HCSC
- United Healthcare
- Blue Cross Blue Shield of Massachusetts
- Elevance
- Humana
- LA Care
- +12 more carriersWith a free account
Plan types Dr. Chang accepts, by number of carriers
- HMO14
- PPO11
- Medicare9
- POS6
- EPO4
- Medicaid1
Source: Dmand AI Insurance Network Data
Sources for Dr. Eugene Y. 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 services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| 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)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)Doctors and Clinicians Utilization Data (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 |
| Clinical trials and co-investigators | Dmand AI Research LinkageClinicalTrials.gov (National Library of Medicine) (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 |
| Insurance carriers and plan types | Dmand AI Insurance Network 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. Eugene Y. 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. Eugene Y. Chang's NPI number?
Dr. Eugene Y. Chang's NPI number is 1265432991. It was assigned on July 22, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. Eugene Y. Chang?
Dr. Eugene Y. Chang is a retina specialist (ophthalmology) physician in Pasadena, California. The primary specialty in the NPI Registry is Retina Specialist (Ophthalmology) Physician (taxonomy code 207WX0107X).
Where does Dr. Eugene Y. Chang practice?
Dr. Chang practices at 2619 E Colorado Blvd, Pasadena, CA 91107. Dr. Chang's primary practice is California Eye Specialists Medical Group Inc in Pasadena, California. Dmand AI also links Dr. Chang to 7 medical groups and 5 group practices and clinics.
What is Dr. Eugene Y. Chang's office phone number?
The practice phone on file for Dr. Chang is (626) 793-4168.
What is Dr. Eugene Y. Chang's medical license number?
Dr. Chang holds California license A77825, one of the licenses on file in 3 states.
Which states has Dr. Eugene Y. Chang been licensed in?
Dmand AI has state licenses on file for Dr. Chang in California (2002 to 2026), Oregon (2018 to 2025) and Illinois (2004 to 2008).
Does Dr. Eugene Y. Chang accept Medicare?
Yes. CMS data shows Dr. Chang billed Medicare for 13 services in 2020, and Dr. Chang accepts Medicare assignment.
Is Dr. Eugene Y. Chang board certified?
Yes. Dr. Chang is board certified in ophthalmology by the American Board of Ophthalmology.
What services does Dr. Eugene Y. Chang bill to Medicare?
In 2020, Dr. Chang's most billed Medicare services were eye exam or test (92134).
Where did Dr. Eugene Y. Chang go to medical school?
Dr. Chang graduated from Tufts University School Of Medicine in 2000.
Show 5 more questionsShow fewer questions
What drugs does Dr. Eugene Y. Chang prescribe most?
In 2024 Medicare Part D data, Dr. Chang's most prescribed drugs by claims were Latanoprost, Dorzolamide-Timolol and Brimonidine Tartrate.
Has Dr. Eugene Y. Chang received payments from drug or device companies?
CMS Open Payments shows $16,618 in general payments to Dr. Chang from 33 companies from 2016 to 2025. The largest total came from Allergan Inc.
How long has Dr. Eugene Y. Chang been practicing?
Dr. Chang graduated from medical school in 2000, 26 years ago.
Does Dr. Eugene Y. Chang do research?
Dmand AI links 1 publication to Dr. Chang. Dr. Chang has worked on 1 clinical trial.
What insurance does Dr. Eugene Y. Chang accept?
Dr. Chang is in network with 20 carriers, including Aetna, Blue Cross Blue Shield of Michigan and HCSC. HMO plans come from the most carriers, 14. Check the plan with the practice before a visit.
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