SEAN TSAO M.D.
NPI 1841550217
Ophthalmology in Irvine, CA
About Sean Tsao M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
SEAN TSAO M.D. (NPI 1841550217) is an individual ophthalmology provider in Irvine, California, licensed in California (A128498) and active in the NPI registry since May 2012. He is enrolled in Medicare PECOS and is a graduate of University Of California, Irvine, California College Of Medicine (2012).
NPPES Registry Identity
Specialties & Licenses 2
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
Sean Tsao M.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
3Medicare enrollment records show Sean Tsao reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Orange, CA 92868
- Reassigned Medicare billing, California enrollment
- 85 clinicians in this Medicare group
Orange, CA 92868
- Reassigned Medicare billing, California enrollment
- 113 clinicians in this Medicare group
Anaheim, CA 92807
- Reassigned Medicare billing, California enrollment
- 13,921 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.
Areas of Expertise CMS Part B claims
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 92617 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.
IRVINE, CA 92617
IRVINE, CA 92617
IRVINE, CA 92617
IRVINE, CA 92617
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 Sean Tsao's NPI number?
The NPI number for Sean Tsao is 1841550217. It was assigned to this individual provider in the NPPES registry on May 20, 2012.
Where is Sean Tsao located?
Sean Tsao practices at 850 Health Sciences Rd, Irvine, CA 92617. The listed phone number is (949) 824-2020.
What is Sean Tsao's specialty?
The primary specialty registered for this NPI is Ophthalmology with taxonomy code 207W00000X.
Is Sean Tsao enrolled in Medicare?
Yes. Sean Tsao 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 Sean Tsao's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Sean Tsao reassigns Medicare benefits to 3 organizations: Regents Of The University Of California (Orange, CA), Regents Of The University Of California (Orange, CA) and Southern California Permanente Medical Group (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 Sean Tsao'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 Sean Tsao was last updated on December 3, 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.
# Sean Tsao, M.D. · NPI 1841550217
Ophthalmology physician in Irvine, California. Individual provider, active in the CMS NPPES registry since May 20, 2012.
## Identity
- **NPI:** 1841550217 (Entity type: Individual)
- **Enumerated:** May 20, 2012
- **Primary specialty:** Ophthalmology · taxonomy 207W00000X
- **State license:** A128498 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 850 HEALTH SCIENCES RD, Irvine, CA 92617-3058
- **Phone:** (949) 824-2020
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **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): Regents Of The University Of California (NPI 1487602579, Orange, CA); Regents Of The University Of California (NPI 1871541953, Orange, CA); Southern California Permanente Medical Group (NPI 1952333460, Anaheim, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of California, Irvine, California College Of Medicine, class of 2012
## Record status
- **NPPES last updated:** December 3, 2021
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Source: [NPI Profile](https://npiprofile.com/npi/1841550217) · Data from the CMS NPPES public registry.