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Gerard Joseph Sim, OD
NPI 1669363883 · Optometrist · Grand Terrace, CA
Gerard Joseph Sim, OD is a Optometrist provider in Grand Terrace, CA (NPI 1669363883).
Provider details
- NPI number
- 1669363883
- Entity type
- Individual
- Primary specialty
- OptometristEye and Vision Services Providers
- Credential
- OD
- Sex
- Male
- Sole proprietor
- No
- License
- OPT36072-TLG (CA)
Specialties & taxonomies
Eye and Vision Services Providers
Profile Score
Established profile(54/100 index)
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
Under 1 yr in 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
11980 Mount Vernon Ave
Grand Terrace, CA 92313-5172
Phone: (951) 654-0803
Street-level locationGet directions
Mailing address
786 Newbury Way
Diamond Bar, CA 91765-4625
Registry dates
- Enumerated
- 2025-07-15
- Last updated
- 2025-07-22
- Certified
- 2025-07-22
Frequently asked questions
- What is Gerard Joseph Sim's NPI number?
- Gerard Joseph Sim's National Provider Identifier (NPI) is 1669363883, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gerard Joseph Sim's specialty?
- Gerard Joseph Sim is listed in the NPPES registry with a primary specialty of Optometrist (Eye and Vision Services Providers).
- Where is Gerard Joseph Sim located?
- Gerard Joseph Sim's practice location on file with NPPES is 11980 Mount Vernon Ave, Grand Terrace, CA 92313-5172.
- What is Gerard Joseph Sim's phone number?
- The practice phone number listed in the NPPES registry for Gerard Joseph Sim is (951) 654-0803.
- Is Gerard Joseph Sim's NPI active?
- Yes — Gerard Joseph Sim's NPI (1669363883) is active in the NPPES registry as of the last update on 2025-07-22.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.