Sylvia Lou Chang
Ophthalmology Physician · Rancho Cucamonga, CA
Sylvia Lou Chang is an ophthalmology physician with a practice address in Rancho Cucamonga, California, and NPI 1053843458, issued on Apr 3, 2017. Check the license (California A187821, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Sylvia Lou Chang
- Primary taxonomy
- Ophthalmology Physician 207W00000X
- License numbers
- A187821 CA
21409 NV
Self-reported in NPPES; status is on the state search - Practice location
- 9170 Haven Ave Ste 102, Rancho Cucamonga, CA 91730
- Phone
- (909) 440-1014
- Enumerated
- Apr 3, 2017
- Record last updated
- Jun 13, 2024
- Fax
- (909) 440-1015
- Medicare enrollment
- Enrolled (PECOS I20231010002001); accepts Medicare assignment
- Medical or professional school
- Wright State University Boonshoft School Of Medicine, 2017
- Entity
- Type 1 · individual
8 nearest ophthalmology physician records → All 2,899 in California → Look up another NPI →
Also registered at 9170 Haven Ave Ste 102
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Genesis Atay, ODOptometrist1912866120
- Phoebe Chen, ODOptometrist1427639426
- Christina Lim, ODOptometrist1245793819
- Kevin Tran, O.D.Optometrist1710030911
- Corinne Wong, ODOptometrist1649835604
Verify Sylvia Lou Chang in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A187821Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.9 times the Medicare Part D claims of the average ophthalmology physician in 2024
4,398 Medicare Part D claims for 1,115 beneficiaries, against an average of 1,518 among the 16,459 providers of this specialty who prescribed in Part D. Brand-name drugs were 38% of claims.
Most prescribed
- Latanoprost813 claims
- Prednisolone Acetate745 claims
- Ketorolac Tromethamine613 claims
- Moxifloxacin331 claims
- Timolol Maleate311 claims
- Brimonidine Tartrate302 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 90.1 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $843.64
21 payments; by number, the most common kind was food and beverage; the largest payer was Alcon Vision LLC. The 13,221 providers of this specialty with any payment received $4,535.02 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through 2 group practices
- Azul Vision IncGlendora, CA
- California Eye Specialists Medical Group IncGlendora, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Sylvia Lou Chang among 2,899 ophthalmology physician records in California
Sylvia Lou Chang is one of 2,899 ophthalmology physician records with a practice address in California. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2017, is newer than 88% of them.
- NPI issued2017 · 88% of these records are older, 10% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 66% of these records are
- Graduated2017 · median 2001 among the 1,907 with a school on file
- Record last updated2024 · 67% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207W00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Ophthalmology Physician providers in California
There are 2,899 ophthalmology physician records in California.
All 2,899 in California → Every provider in Rancho Cucamonga → Ophthalmology Physician nationwide →
The 8 ophthalmology physician records with the nearest ZIP codes
- Jaskarn Johl, DORancho Cucamonga, CA 917301245492677
- Sami Kabbara, MDRancho Cucamonga, CA 917301609372366
- Michael Pham, DORancho Cucamonga, CA 917301922462845
- Mukesh Suthar, MDRancho Cucamonga, CA 917301740338607
- Randolph Falk, M.D.El Monte, CA 917311043294507
- Eddie Garcia, M.D.El Monte, CA 917311164447678
- Shelly Bagai Lapsi, MDCovina, CA 917231376555862
- Jeffrey Frey, M.D.Covina, CA 917231477588374
Common questions
What is Sylvia Lou Chang's NPI number?
Sylvia Lou Chang's National Provider Identifier (NPI) is 1053843458, issued on Apr 3, 2017. An NPI identifies a provider in billing; it is not a license.
Where is Sylvia Lou Chang located?
The NPPES record lists a practice address at 9170 Haven Ave Ste 102, Rancho Cucamonga, CA, 91730. Phone: (909) 440-1014. Providers update this record themselves, so call before visiting.
How can I verify Sylvia Lou Chang's license?
NPPES lists California license number A187821, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Sylvia Lou Chang prescribe under Medicare Part D?
In 2024, Sylvia Lou Chang had 4,398 Medicare Part D claims for 1,115 beneficiaries; the average among ophthalmology physician prescribers was 1,518. Part D covers Medicare prescriptions only.
What is Sylvia Lou Chang's MIPS final score?
The 2023 MIPS final score is 90.1 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.