Sylvester Nguyen
NPI 1861844680 · Optometrist · Modesto, CA
Enrolled with Medicare as Practitioner - Optometry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Sylvester Nguyen is a Optometrist provider in Modesto, CA (NPI 1861844680).
Provider details
- NPI number
- 1861844680
- Entity type
- Individual
- Primary specialty
- OptometristEye and Vision Services Providers
- Sex
- Male
- Sole proprietor
- No
- License
- CA298165 (CA)
Specialties & taxonomies
Eye and Vision Services Providers
Eye and Vision Services Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
9 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 1 distinct drug on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Cyclosporine | 24 | 12 |
Medicare Part D only. These counts cover prescriptions paid through Medicare Part D in 2024 — they do notinclude cash-pay, commercial-insurance, Medicaid, or Part B–administered drugs, and badly undercount high cash-pay categories (e.g. GLP-1 weight-loss, testosterone, and ED medications). Any drug with 10 or fewer claims is omitted by CMS, and beneficiary counts under 11 are suppressed — so a missing drug means no Part D record, never zero. This is a factual claims summary, not an endorsement, not medical advice, and not a consumer report. Source: CMS Medicare Part D Prescribers — by Provider and Drug.
Practice location
Mailing address
Registry dates
- Enumerated
- 2016-07-05
- Last updated
- 2021-02-12
- Certified
- 2021-02-12
Frequently asked questions
- What is Sylvester Nguyen's NPI number?
- Sylvester Nguyen's National Provider Identifier (NPI) is 1861844680, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sylvester Nguyen's specialty?
- Sylvester Nguyen is listed in the NPPES registry with a primary specialty of Optometrist (Eye and Vision Services Providers).
- Where is Sylvester Nguyen located?
- Sylvester Nguyen's practice location on file with NPPES is 3200 Sisk Rd, Modesto, CA 95356-0546.
- What is Sylvester Nguyen's phone number?
- The practice phone number listed in the NPPES registry for Sylvester Nguyen is (510) 332-3175.
- Does Sylvester Nguyen accept Medicare?
- Sylvester Nguyen is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Sylvester Nguyen's NPI active?
- Yes — Sylvester Nguyen's NPI (1861844680) is active in the NPPES registry as of the last update on 2021-02-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.