MONICA TSAI
NPI 1598176497
Internal Medicine - Allergy & Immunology in Orange, CA
About Monica Tsai NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MONICA TSAI (NPI 1598176497) is an individual allergy & immunology provider in Orange, California, licensed in California (A142506) and active in the NPI registry since May 2014. She is enrolled in Medicare PECOS, maintains 2 additional practice locations, and is a graduate of University Of California, Geffen School Of Medicine (2014).
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Locations 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
Monica Tsai 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 Monica Tsai reassigns Medicare billing to 2 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
- 525 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.
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 20
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 Monica Tsai's NPI number?
The NPI number for Monica Tsai is 1598176497. It was assigned to this individual provider in the NPPES registry on May 13, 2014.
Where is Monica Tsai located?
Monica Tsai practices at 101 The City Dr S, Orange, CA 92868. The listed phone number is (714) 456-8888.
What is Monica Tsai's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Allergy & Immunology, with taxonomy code 207RA0201X.
Is Monica Tsai enrolled in Medicare?
Yes. Monica 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 Monica Tsai's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Monica Tsai reassigns Medicare benefits to 2 organizations: Uc Regents (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 Monica 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 Monica Tsai was last updated on January 16, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.
# Monica Tsai · NPI 1598176497
Allergy & Immunology physician in Orange, California. Individual provider, active in the CMS NPPES registry since May 13, 2014.
## Identity
- **NPI:** 1598176497 (Entity type: Individual)
- **Enumerated:** May 13, 2014
- **Primary specialty:** Internal Medicine - Allergy & Immunology · taxonomy 207RA0201X
- **State license:** A142506 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 101 THE CITY DR S, Orange, CA 92868-3201
- **Phone:** (714) 456-8888
## 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): Uc Regents (NPI 1003864174, Orange, CA); Southern California Permanente Medical Group (NPI 1952333460, Anaheim, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of California, Geffen School Of Medicine, class of 2014
## Record status
- **NPPES last updated:** January 16, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1598176497) · Data from the CMS NPPES public registry.