WILLIAM CHANG OD, INC
NPI 1255669057
Optometrist in San Gabriel, CA
About William Chang Od, Inc NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
WILLIAM CHANG OD, INC (NPI 1255669057) is a healthcare organization registered as an optometrist in San Gabriel, California and active in the NPI registry since December 2009. The organization lists William Chang, Owner, as its authorized official.
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 2
Group Practice 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, revalidation and the clinicians who bill Medicare through this organization, from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
William Chang Od, Inc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Revalidation Due Date
Revalidation due by February 28, 2027
Medicare-enrolled providers and suppliers confirm their enrollment information with CMS on a set cycle, every 5 years for most and every 3 years for medical equipment suppliers. CMS sets the due date for each enrollment.
Clinicians Billing Medicare Through This Organization
2Medicare enrollment records show 2 clinicians reassign Medicare billing to William Chang Od, Inc, which bills Medicare for the services they deliver. Of these, 2 practice at this address. They are listed nearest first.
Clinicians, nearest first (2)
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is William Chang Od, Inc's NPI number?
The NPI number for William Chang Od, Inc is 1255669057. It was assigned to this organization in the NPPES registry on December 7, 2009.
Where is William Chang Od, Inc located?
William Chang Od, Inc is located at 417 S San Gabriel Blvd Suite B, San Gabriel, CA 91776. The listed phone number is (626) 291-2020.
What is William Chang Od, Inc's specialty?
The primary specialty registered for this NPI is Optometrist with taxonomy code 152W00000X.
Is William Chang Od, Inc enrolled in Medicare?
Yes. William Chang Od, Inc is registered in the Medicare PECOS enrollment system.
When is William Chang Od, Inc's Medicare revalidation due?
According to the CMS Revalidation Due Date List (October 2026 release), the Medicare Non-DME Part B enrollment for this organization (California, Clinic/Group Practice) is due for revalidation by February 28, 2027. Medicare providers and suppliers revalidate their enrollment every 5 years, and medical equipment suppliers every 3 years. Confirm current requirements with your Medicare Administrative Contractor.
How many clinicians bill Medicare through William Chang Od, Inc?
According to the CMS Revalidation Reassignment List (October 2026 release), 2 clinicians, all in Optometry, reassign their Medicare billing to William Chang Od, Inc. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. Of these, 2 practice at this address. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
What insurance does William Chang Od, Inc accept?
Health plans from Anthem Blue Cross and Blue Shield, Blue Cross and Blue Shield of Montana, Blue Cross and Blue Shield of Oklahoma, Blue Cross and Blue Shield of Texas and BlueCross BlueShield of Tennessee list William Chang Od, Inc as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for William Chang Od, Inc was last updated on September 16, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# William Chang Od, Inc · NPI 1255669057
Optometrist organization in San Gabriel, California. Organization record, active in the CMS NPPES registry since December 7, 2009.
## Identity
- **NPI:** 1255669057 (Entity type: Organization)
- **Enumerated:** December 7, 2009
- **Primary specialty:** Optometrist · taxonomy 152W00000X
- **Organization subpart:** No
- **Authorized official:** William Chang, OWNER
## Practice location
- **Address:** 417 S SAN GABRIEL BLVD, SUITE B, San Gabriel, CA 91776-1967
- **Phone:** (626) 291-2020 · **Fax:** (626) 585-2905
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Medicare revalidation due:** February 28, 2027 (Non-DME Part B, California, Clinic/Group Practice) · CMS Revalidation Due Date List, October 2026 release
- **Clinicians billing through this organization:** 2 clinicians (Optometry) reassign Medicare billing to this organization (form CMS-855R); 2 practice at this address · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** September 16, 2021
- **Other identifiers:** Medicaid 1255669057 (CA); Other CR713Z (CA)
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Source: [NPI Profile](https://npiprofile.com/npi/1255669057) · Data from the CMS NPPES public registry.