Sylvia Ja, O.D.
NPI 1780836080 · Optometrist · Cupertino, CA
Enrolled with Medicare as Practitioner - Optometry · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Sylvia Ja, O.D. is a Optometrist provider in Cupertino, CA (NPI 1780836080).
Provider details
- NPI number
- 1780836080
- Entity type
- Individual
- Primary specialty
- OptometristEye and Vision Services Providers
- Credential
- O.D.
- Sex
- Female
- Sole proprietor
- No
- License
- 13512 (CA)
Specialties & taxonomies
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
17 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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2008-10-17
- Last updated
- 2022-01-03
Frequently asked questions
- What is Sylvia Ja's NPI number?
- Sylvia Ja's National Provider Identifier (NPI) is 1780836080, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Sylvia Ja's specialty?
- Sylvia Ja is listed in the NPPES registry with a primary specialty of Optometrist (Eye and Vision Services Providers).
- Where is Sylvia Ja located?
- Sylvia Ja's practice location on file with NPPES is 21465 Millard Ln, Cupertino, CA 95014-1320.
- What is Sylvia Ja's phone number?
- The practice phone number listed in the NPPES registry for Sylvia Ja is (408) 735-8522.
- Does Sylvia Ja accept Medicare?
- Sylvia Ja is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Sylvia Ja's NPI active?
- Yes — Sylvia Ja's NPI (1780836080) is active in the NPPES registry as of the last update on 2022-01-03.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.