DR. WILLIAM DOAN NGUYEN OD
NPI 1689564486
Optometrist in San Francisco, CA
About Dr. William Doan Nguyen Od NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. WILLIAM DOAN NGUYEN OD (NPI 1689564486) is an individual optometrist in San Francisco, California, licensed in California (36323) and active in the NPI registry since July 2025. He is enrolled in Medicare PECOS, maintains a secondary practice location in San Francisco, and is a graduate of State University Of New York - State College Optometry (2025).
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Dr. William Doan Nguyen Od is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
3Medicare enrollment records show William Doan Nguyen reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
San Francisco, CA 94143
- Reassigned Medicare billing, California enrollment
- 5,645 clinicians in this Medicare group
San Francisco, CA 94122
- Reassigned Medicare billing, California enrollment
- 5,544 clinicians in this Medicare group
New York, NY 10036
- Reassigned Medicare billing, New York enrollment
- 216 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 94158 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SAN FRANCISCO, CA 94158
SAN FRANCISCO, CA 94158
SAN FRANCISCO, CA 94158
SAN FRANCISCO, CA 94158
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 Doan Nguyen's NPI number?
The NPI number for William Doan Nguyen is 1689564486. It was assigned to this individual provider in the NPPES registry on July 4, 2025.
Where is William Doan Nguyen located?
William Doan Nguyen practices at 490 Illinois St, San Francisco, CA 94158. The listed phone number is (415) 530-6123.
What is William Doan Nguyen's specialty?
The primary specialty registered for this NPI is Optometrist with taxonomy code 152W00000X.
Is William Doan Nguyen enrolled in Medicare?
Yes. William Doan Nguyen is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for William Doan Nguyen's services?
According to the CMS Revalidation Reassignment List (October 2026 release), William Doan Nguyen reassigns Medicare benefits to 3 organizations: University Of California San Francisco (San Francisco, CA), Ucsf Medical Group Business Services (San Francisco, CA) and State Of New York Comptrollers Office (New York, NY). Each 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 William Doan Nguyen's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does William Doan Nguyen accept?
Health plans from Blue Cross Blue Shield of Wyoming, Blue Cross and Blue Shield of Louisiana, Blue Cross and Blue Shield of Montana, Blue Cross and Blue Shield of Oklahoma and Blue Cross and Blue Shield of Texas and 8 other insurers list William Doan Nguyen 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 Doan Nguyen was last updated on July 17, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 months 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.
# Dr. William Doan Nguyen, OD · NPI 1689564486
Optometrist provider in San Francisco, California. Individual provider, active in the CMS NPPES registry since July 4, 2025.
## Identity
- **NPI:** 1689564486 (Entity type: Individual)
- **Enumerated:** July 4, 2025
- **Primary specialty:** Optometrist · taxonomy 152W00000X
- **State license:** 36323 (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 490 ILLINOIS ST, San Francisco, CA 94158
- **Phone:** (415) 530-6123
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 3 organizations under Medicare reassignment (form CMS-855R): University Of California San Francisco (NPI 1346329380, San Francisco, CA); Ucsf Medical Group Business Services (NPI 1477624104, San Francisco, CA); State Of New York Comptrollers Office (NPI 1407829856, New York, NY) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** State University Of New York - State College Optometry, class of 2025
## Record status
- **NPPES last updated:** July 17, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1689564486) · Data from the CMS NPPES public registry.