DR. IRENE TSAI M.D.
NPI 1447558044
Radiology - Diagnostic Radiology in Orange, CA
About Dr. Irene Tsai M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. IRENE TSAI M.D. (NPI 1447558044) is an individual diagnostic radiology provider in Orange, California, licensed in California (A118951) and active in the NPI registry since March 2011. She is enrolled in Medicare PECOS, maintains a secondary practice location in Los Angeles, and is a graduate of Other (2015).
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. Irene Tsai 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
6Medicare enrollment records show Irene Tsai reassigns Medicare billing to 6 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
- 202 clinicians in this Medicare group
Bellflower, CA 90706
- Reassigned Medicare billing, California enrollment
- Medicare enrollment name: County Of Los Angeles
- 1,939 clinicians in this Medicare group
Los Angeles, CA 90025
- Reassigned Medicare billing, California enrollment
- 311 clinicians in this Medicare group
Los Angeles, CA 90025
- Reassigned Medicare billing, California enrollment
- 372 clinicians in this Medicare group
Encino, CA 91436
- Reassigned Medicare billing, California enrollment
- 329 clinicians in this Medicare group
Stockton, CA 95210
- Reassigned Medicare billing, California enrollment
- 219 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 19
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 92868 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Other Providers at the Same Location NPPES 9
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
ORANGE, CA 92868
ORANGE, CA 92868
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 Irene Tsai's NPI number?
The NPI number for Irene Tsai is 1447558044. It was assigned to this individual provider in the NPPES registry on March 5, 2011.
Where is Irene Tsai located?
Irene Tsai practices at 101 The City Dr S Bldg 30, Orange, CA 92868. The listed phone number is (714) 456-2235.
What is Irene Tsai's specialty?
The primary specialty registered for this NPI is Radiology, specializing in Diagnostic Radiology, with taxonomy code 2085R0202X.
Is Irene Tsai enrolled in Medicare?
Yes. Irene Tsai 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 Irene Tsai's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Irene Tsai reassigns Medicare benefits to 6 organizations: Uc Regents (Orange, CA), County Of Los Angeles Auditor Controller (Bellflower, CA), Pronet Imaging Medical Group, Inc. (Los Angeles, CA), Beverly Radiology Medical Group III (Los Angeles, CA), San Fernando Valley Interventional Radiology And Imaging Center (Encino, CA) and 1 more organization, listed in the Medicare section above. 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 Irene Tsai'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 Irene Tsai was last updated on September 22, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 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. Irene Tsai, M.D. · NPI 1447558044
Diagnostic Radiology physician in Orange, California. Individual provider, active in the CMS NPPES registry since March 5, 2011.
## Identity
- **NPI:** 1447558044 (Entity type: Individual)
- **Enumerated:** March 5, 2011
- **Primary specialty:** Radiology - Diagnostic Radiology · taxonomy 2085R0202X
- **State license:** A118951 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 101 THE CITY DR S BLDG 30, Orange, CA 92868-3201
- **Phone:** (714) 456-2235
## 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:** 6 organizations under Medicare reassignment (form CMS-855R): Uc Regents (NPI 1346298528, Orange, CA); County Of Los Angeles Auditor Controller (NPI 1689695892, Bellflower, CA); Pronet Imaging Medical Group, Inc. (NPI 1528099488, Los Angeles, CA); Beverly Radiology Medical Group III (NPI 1962457812, Los Angeles, CA); San Fernando Valley Interventional Radiology And Imaging Center (NPI 1942350889, Encino, CA); and 1 more · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2015
## Record status
- **NPPES last updated:** September 22, 2020
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Source: [NPI Profile](https://npiprofile.com/npi/1447558044) · Data from the CMS NPPES public registry.