ELLEN TSAY
NPI 1194354951
Orthopaedic Surgery in Vacaville, CA
About Ellen Tsay NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
ELLEN TSAY (NPI 1194354951) is an individual orthopaedic surgery provider in Vacaville, California, licensed in Pennsylvania (MD487615) and active in the NPI registry since April 2020. She is enrolled in Medicare PECOS, is affiliated with Bryn Mawr Hospital, and is a graduate of Other (2020).
NPPES Registry Identity
Specialties & Licenses
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
Ellen Tsay 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 Ellen Tsay reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Philadelphia, PA 19107
- Reassigned Medicare billing, Pennsylvania enrollment
- 361 clinicians in this Medicare group
Marlton, NJ 08053
- Reassigned Medicare billing, New Jersey enrollment
- 398 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.
Hospital Affiliations CMS Care Compare 5
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Bryn Mawr Hospital
Acute Care Hospitals · Bryn Mawr, PAThomas Jefferson University Hospital
Acute Care Hospitals · Philadelphia, PAAbington Memorial Hospital
Acute Care Hospitals · Abington, PARothman Orthopaedic Specialty Hospital
Acute Care Hospitals · Bensalem, PAPhysicians Care Surgical Hospital
Acute Care Hospitals · Royersford, PAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 95688 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.
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 Ellen Tsay's NPI number?
The NPI number for Ellen Tsay is 1194354951. It was assigned to this individual provider in the NPPES registry on April 3, 2020.
Where is Ellen Tsay located?
Ellen Tsay practices at 1 Quality Dr, Vacaville, CA 95688. The listed phone number is (707) 651-5502.
What is Ellen Tsay's specialty?
The primary specialty registered for this NPI is Orthopaedic Surgery with taxonomy code 207X00000X.
Is Ellen Tsay enrolled in Medicare?
Yes. Ellen Tsay 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 Ellen Tsay's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Ellen Tsay reassigns Medicare benefits to 2 organizations: Reconstructive Orthopaedic Associates II LLC (Philadelphia, PA) and Rothman Orthopaedics Of New Jersey, LLC (Marlton, NJ). 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 Ellen Tsay's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Ellen Tsay affiliated with any hospitals?
According to CMS data, Ellen Tsay is affiliated with Bryn Mawr Hospital, Thomas Jefferson University Hospital, Abington Memorial Hospital, Rothman Orthopaedic Specialty Hospital and Physicians Care Surgical Hospital.
When was this NPI record last updated?
The NPPES record for Ellen Tsay was last updated on September 22, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 38 days 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.
# Ellen Tsay · NPI 1194354951
Orthopaedic Surgery physician in Vacaville, California. Individual provider, active in the CMS NPPES registry since April 3, 2020.
## Identity
- **NPI:** 1194354951 (Entity type: Individual)
- **Enumerated:** April 3, 2020
- **Primary specialty:** Orthopaedic Surgery · taxonomy 207X00000X
- **State license:** MD487615 (Pennsylvania)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 1 QUALITY DR, Vacaville, CA 95688-9494
- **Phone:** (707) 651-5502
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Reconstructive Orthopaedic Associates II LLC (NPI 1861433278, Philadelphia, PA); Rothman Orthopaedics Of New Jersey, LLC (NPI 1215978630, Marlton, NJ) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2020
## Record status
- **NPPES last updated:** September 22, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1194354951) · Data from the CMS NPPES public registry.