Sylvester Nguyen
Optometrist · Modesto, CA
Sylvester Nguyen is an optometrist with a practice address in Modesto, California, and NPI 1861844680, issued on Jul 5, 2016. Check the license (California 33381, as entered in NPPES) with the California board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Sylvester Nguyen
- Primary taxonomy
- Optometrist 152W00000X
- License numbers
- 33381 CA
CA298165 CA
Self-reported in NPPES; status is on the state search - Practice location
- 3200 Sisk RD, Modesto, CA 95356
- Phone
- (510) 332-3175
- Enumerated
- Jul 5, 2016
- Record last updated
- Feb 12, 2021 (not updated in 5 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20161024000728); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest optometrist records → All 8,308 in California → Look up another NPI →
Also registered at 3200 Sisk RD
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Lina Lee, O.D.Optometrist1215186598
Verify Sylvester Nguyen in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this profession
Search for license 33381Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
87% fewer Medicare Part D claims than the average optometrist in 2024
35 Medicare Part D claims for 18 beneficiaries, against an average of 277 among the 33,128 providers of this specialty who prescribed in Part D. Brand-name drugs were 74% of claims.
Most prescribed
- Cyclosporine24 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.
Bills Medicare through one group practice
- Permanente Medical Group IncSacramento, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Sylvester Nguyen among 8,308 optometrist records in California
Sylvester Nguyen is one of 8,308 optometrist records with a practice address in California. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2016, is newer than 73% of them.
- NPI issued2016 · 73% of these records are older, 24% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 43% of these records are
- Graduated2016 · median 2008 among the 3,573 with a school on file
- Record last updated2021 · 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 152W00000X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Optometrist providers in California
There are 8,308 optometrist records in California.
All 8,308 in California → Every provider in Modesto → Optometrist nationwide →
The 8 optometrist records with the nearest ZIP codes
- Angela Abe, OPTModesto, CA 953561336108885
- Chea-Yo Chang, O.D.Modesto, CA 953561811192289
- Jack Hall, O.D.Modesto, CA 953561639228331
- Lina Lee, O.D.Modesto, CA 953561215186598
- Patrick Lonowski, O.D.Modesto, CA 953561073520425
- Daniel Lundgren, ODModesto, CA 953561811986375
- Diana MehannyModesto, CA 953561215636279
- Lincoln Service, O.D.Modesto, CA 953561619028842
Common questions
What is Sylvester Nguyen's NPI number?
Sylvester Nguyen's National Provider Identifier (NPI) is 1861844680, issued on Jul 5, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Sylvester Nguyen located?
The NPPES record lists a practice address at 3200 Sisk RD, Modesto, CA, 95356. Phone: (510) 332-3175. Providers update this record themselves, so call before visiting.
How can I verify Sylvester Nguyen's license?
NPPES lists California license number 33381, as entered by the provider. Search the California board that licenses this profession; the NPPES record confirms identity only.
How much does Sylvester Nguyen prescribe under Medicare Part D?
In 2024, Sylvester Nguyen had 35 Medicare Part D claims for 18 beneficiaries; the average among optometrist prescribers was 277. Part D covers Medicare prescriptions only.
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.