William Chang OD, Inc
NPI 1255669057 · Optometrist · San Gabriel, CA
Enrolled with Medicare as Part B Supplier - Clinic/Group Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
William Chang OD, Inc is a Optometrist organization in San Gabriel, CA (NPI 1255669057).
Provider details
- NPI number
- 1255669057
- Entity type
- Organization
- Primary specialty
- OptometristEye and Vision Services Providers
- Organization subpart
- No
- Authorized official
- William Chang, Owner(626) 291-2020
- License
- 13713 (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
16 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
- 2009-12-07
- Last updated
- 2021-09-16
- Certified
- 2021-09-16
Frequently asked questions
- What is William Chang OD, Inc's NPI number?
- William Chang OD, Inc's National Provider Identifier (NPI) is 1255669057, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is William Chang OD, Inc?
- William Chang OD, Inc is classified in the NPPES registry as Optometrist (Eye and Vision Services Providers).
- Where is William Chang OD, Inc located?
- William Chang OD, Inc's practice location on file with NPPES is 417 S San Gabriel Blvd, San Gabriel, CA 91776-1967.
- What is William Chang OD, Inc's phone number?
- The practice phone number listed in the NPPES registry for William Chang OD, Inc is (626) 291-2020.
- Does William Chang OD, Inc accept Medicare?
- William Chang OD, Inc is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Who is the authorized official for William Chang OD, Inc?
- The authorized official listed on William Chang OD, Inc's NPPES record is William Chang, Owner. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is William Chang OD, Inc's NPI active?
- Yes — William Chang OD, Inc's NPI (1255669057) is active in the NPPES registry as of the last update on 2021-09-16.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.