EUGENE Y CHANG MD
NPI 1265432991
Ophthalmology - Retina Specialist in Buena Park, CA
About Eugene Y Chang Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
EUGENE Y CHANG MD (NPI 1265432991) is an individual retina specialist in Buena Park, California, licensed in California (A77825) and active in the NPI registry since July 2005. He is enrolled in Medicare PECOS, maintains a secondary practice location in Rancho Mirage, and is a graduate of Tufts University School Of Medicine (2000).
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Other Identifiers 2
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Eugene Y Chang Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
6Medicare enrollment records show Eugene Chang reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Buena Park, CA 90621
- Reassigned Medicare billing, California enrollment
- 11 clinicians in this Medicare group
Anaheim, CA 92805
- Reassigned Medicare billing, California enrollment
- Also billed through NPI 1871057786 (California)
- 16 clinicians in this Medicare group
Pasadena, CA 91107
- Reassigned Medicare billing, California enrollment
- 30 clinicians in this Medicare group
Pasadena, CA 91107
- Reassigned Medicare billing, California enrollment
- 70 clinicians in this Medicare group
Los Angeles, CA 90004
- Reassigned Medicare billing, California enrollment
- 11 clinicians in this Medicare group
Medford, OR 97504
- Reassigned Medicare billing, Oregon enrollment
- 2 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 90621 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Reported Quality Measures
Other Providers at the Same Location NPPES 4
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Eugene Chang's NPI number?
The NPI number for Eugene Chang is 1265432991. It was assigned to this individual provider in the NPPES registry on July 22, 2005.
Where is Eugene Chang located?
Eugene Chang practices at 5832 Beach Blvd Unit 109, Buena Park, CA 90621. The listed phone number is (714) 228-1888.
What is Eugene Chang's specialty?
The primary specialty registered for this NPI is Ophthalmology, specializing in Retina Specialist, with taxonomy code 207WX0107X.
Is Eugene Chang enrolled in Medicare?
Yes. Eugene Chang is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Eugene Chang's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Eugene Chang reassigns Medicare benefits to 6 organizations: Eyecare Medical Corporation (Buena Park, CA), Eyecare Specialists Medical Group, Inc (Anaheim, CA), California Eye Specialists Medical Group, Inc (Pasadena, CA), Azul Vision Inc. (Pasadena, CA), Bethel Eye Center Medical Corporation (Los Angeles, CA) and 1 more organization, listed in the Medicare section above. Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Eugene Chang's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Eugene Chang accept?
Health plans from Anthem Blue Cross and Blue Shield, Blue Cross Blue Shield of Wyoming, Blue Cross and Blue Shield of Louisiana, Blue Cross and Blue Shield of Montana and Blue Cross and Blue Shield of Oklahoma and 1 other insurer list Eugene Chang as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for Eugene Chang was last updated on May 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Eugene Y Chang, MD · NPI 1265432991
Retina Specialist physician in Buena Park, California. Individual provider, active in the CMS NPPES registry since July 22, 2005.
## Identity
- **NPI:** 1265432991 (Entity type: Individual)
- **Enumerated:** July 22, 2005
- **Primary specialty:** Ophthalmology - Retina Specialist · taxonomy 207WX0107X
- **State license:** A77825 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 5832 BEACH BLVD UNIT 109, Buena Park, CA 90621-5500
- **Phone:** (714) 228-1888 · **Fax:** (714) 676-1984
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 6 organizations under Medicare reassignment (form CMS-855R): Eyecare Medical Corporation (NPI 1427016120, Buena Park, CA); Eyecare Specialists Medical Group, Inc (NPI 1437181930, Anaheim, CA); California Eye Specialists Medical Group, Inc (NPI 1699713099, Pasadena, CA); Azul Vision Inc. (NPI 1285247528, Pasadena, CA); Bethel Eye Center Medical Corporation (NPI 1972980191, Los Angeles, CA); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Tufts University School Of Medicine, class of 2000
## Record status
- **NPPES last updated:** May 29, 2026
- **Other identifiers:** Medicaid 036111048 (IL); Medicaid 1265432991 (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1265432991) · Data from the CMS NPPES public registry.