DR. CATHERINE TUONG O.D.
NPI 1477993723
Optometrist in Ontario, CA
About Dr. Catherine Tuong O.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. CATHERINE TUONG O.D. (NPI 1477993723) is an individual optometrist in Ontario, California, licensed in California (14662 TLG) and active in the NPI registry since July 2013. She is enrolled in Medicare PECOS, maintains a secondary practice location in Riverside, and is a graduate of Southern California College Of Optometry (2013).
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Catherine Tuong O.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Catherine Tuong reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Fontana, CA 92335
- Reassigned Medicare billing, California enrollment
- Also billed through NPI 1952333460 (California)
- 5,228 clinicians in this Medicare group
Anaheim, CA 92807
- Reassigned Medicare billing, California enrollment
- 131 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 91764 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 6
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
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 Catherine Tuong's NPI number?
The NPI number for Catherine Tuong is 1477993723. It was assigned to this individual provider in the NPPES registry on July 1, 2013.
Where is Catherine Tuong located?
Catherine Tuong practices at 951 N Milliken Ave, Ontario, CA 91764. The listed phone number is (909) 481-9801.
What is Catherine Tuong's specialty?
The primary specialty registered for this NPI is Optometrist with taxonomy code 152W00000X.
Is Catherine Tuong enrolled in Medicare?
Yes. Catherine Tuong is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Catherine Tuong's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Catherine Tuong reassigns Medicare benefits to 2 organizations: Southern California Permanente Medical Group (Fontana, CA) and Marshall B. Ketchum University (Anaheim, CA). 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 Catherine Tuong's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Catherine Tuong was last updated on November 29, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.
# Dr. Catherine Tuong, O.D. · NPI 1477993723
Optometrist provider in Ontario, California. Individual provider, active in the CMS NPPES registry since July 1, 2013.
## Identity
- **NPI:** 1477993723 (Entity type: Individual)
- **Enumerated:** July 1, 2013
- **Primary specialty:** Optometrist · taxonomy 152W00000X
- **State license:** 14662 TLG (California)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 951 N MILLIKEN AVE, Ontario, CA 91764-5008
- **Phone:** (909) 481-9801
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Southern California Permanente Medical Group (NPI 1689606196, Fontana, CA); Marshall B. Ketchum University (NPI 1174037493, Anaheim, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Southern California College Of Optometry, class of 2013
## Record status
- **NPPES last updated:** November 29, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1477993723) · Data from the CMS NPPES public registry.