Sylvia Lou Chang
Ophthalmology · Rancho Cucamonga, CA
At a glance
9170 Haven Ave Ste 102, Rancho Cucamonga, CA 91730-5416
Published activity: Cataract surgery. View counts and coverage
NPPES record updated Jun 13, 2024. Public records can lag behind changes at a practice.
Before you call: a quick checklist
- Are you accepting new patients?
- Do you accept my specific insurance plan?
- Do you provide the service I need at this address?
- Do I need a referral, and what is the earliest appointment?
Insurance participation and appointment availability are not established by these public records.
Medicare & insurance
Insurance participation is not established by these public records. Ask the practice and your insurer about your specific plan and this location.
How to check your coverage
Use your plan’s provider directory or the member-services number on your insurance card. Confirm the clinician, practice address, service, and whether a referral is required. A missing opt-out record does not establish Medicare acceptance.
Check the official Medicare directory ↗Practice location
9170 Haven Ave Ste 102Rancho Cucamonga, CA 91730-5416
Additional reported practice locations
150 S Grand Ave Ste JGlendora, CA 917414716
Phone: 6263352114
Fax: 6269636497 207 S Santa Anita St Ste P25
San Gabriel, CA 917761145
Phone: 6262001277
Fax: 6262001278
Education & affiliations
- Medical / professional school
- Wright State University Boonshoft School Of Medicine
- Graduation year
- 2017
- CMS specialties
- Ophthalmology
Practice groups
Graduation year does not establish years in practice. A reported affiliation does not establish employment, current admitting privileges, or insurance participation.
Source: CMS National Downloadable File · Published Oct 15, 2026.
Procedures in the public data
Reported activity can help you ask more informed questions about a practice’s services.
| Procedure category | Published Medicare activity |
|---|---|
| Cataract surgery | 32 |
CMS uses a one-year claims window with a reporting lag. Counts cover the Medicare activity included by CMS, not all patients. “1–10” is a published range. Volume is not a quality or outcomes score. Coverage and methodology
Source: CMS Utilization Data · Published Oct 15, 2026.
Find providers with a similar service mix
Compare 2024 published Medicare activity in the same reported specialty, here or in another city.
Industry-reported general payments
Includes reported transfers of value, such as meals, travel, or consulting. Payments do not establish improper conduct or quality of care. Research funding and ownership values are excluded from this total.
See payment purposes and reporting companies
Reported purposes
| Purpose | Amount |
|---|---|
| Food and beverage | $950.38 |
Reporting companies
| Company | Amount |
|---|---|
| BAUSCH & LOMB AMERICAS INC. | $256.32 |
| SIGHT SCIENCES, INC. | $203.82 |
| AMGEN INC. | $156.17 |
| ALCON VISION LLC | $84.85 |
| OYSTER POINT PHARMA, INC. | $57.42 |
| DOMPE US, INC. | $52.14 |
| SUN PHARMACEUTICAL INDUSTRIES INC. | $50.29 |
| JOHNSON & JOHNSON SURGICAL VISION, INC. | $38.82 |
| Other reporting companies | $50.55 |
Source: CMS 2025 payments grouped by covered recipient and nature of payments · Published Jun 30, 2026.
Professional details: NPI, taxonomy & registry record
Registry details
- Primary taxonomy
- Ophthalmology
- Taxonomy code
- 207W00000X
- Enumeration date
- Apr 3, 2017
- Record updated
- Jun 13, 2024
More registry details
- Provider type
- Individual · Type 1
- Other reported name
- LOU ZHANG
Reported taxonomies and licenses
207W00000X
License reported: 21409 NV
207W00000X · Primary
License reported: A187821 CA
License numbers and credentials are reported to NPPES; HCPList does not independently verify them.
Practice location
9170 Haven Ave Ste 102Rancho Cucamonga, CA 91730-5416
- Phone
- (909) 440-1014
- Fax
- (909) 440-1015
Mailing address
14726 RAMONA AVE STE 203CHINO, CA 917105730
Information may be outdated or incomplete. Confirm details directly with the practice. HCPList is an independent directory and is not affiliated with CMS.
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