MAHSA REZAEI MD
NPI 1457731747
Family Medicine in Fountain Valley, CA
About Mahsa Rezaei Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MAHSA REZAEI MD (NPI 1457731747) is an individual family medicine provider in Fountain Valley, California, licensed in California (A146947) and active in the NPI registry since June 2015. She is enrolled in Medicare PECOS and is a graduate of Other (2015).
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
Mahsa Rezaei Md 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
4Medicare enrollment records show Mahsa Rezaei reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Fountain Valley, CA 92708
- Reassigned Medicare billing, California enrollment
- 948 clinicians in this Medicare group
Santa Ana, CA 92701
- Reassigned Medicare billing, California enrollment
- 255 clinicians in this Medicare group
Orange, CA 92868
- Reassigned Medicare billing, California enrollment
- 114 clinicians in this Medicare group
Orange, CA 92868
- Reassigned Medicare billing, California enrollment
- 75 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 3
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 92708 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.
FOUNTAIN VALLEY, CA 92708
FOUNTAIN VALLEY, CA 92708
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 Mahsa Rezaei's NPI number?
The NPI number for Mahsa Rezaei is 1457731747. It was assigned to this individual provider in the NPPES registry on June 2, 2015.
Where is Mahsa Rezaei located?
Mahsa Rezaei practices at 11420 Warner Ave, Fountain Valley, CA 92708. The listed phone number is (714) 549-1300.
What is Mahsa Rezaei's specialty?
The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.
Is Mahsa Rezaei enrolled in Medicare?
Yes. Mahsa Rezaei 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 Mahsa Rezaei's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mahsa Rezaei reassigns Medicare benefits to 4 organizations: Memorialcare Medical Foundation (Fountain Valley, CA), University Of California Irvine (Santa Ana, CA), Regents Of The University Of (Orange, CA) and Regents Of The University Of California (Orange, 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 Mahsa Rezaei'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 Mahsa Rezaei was last updated on January 31, 2019. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 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.
# Mahsa Rezaei, MD · NPI 1457731747
Family Medicine physician in Fountain Valley, California. Individual provider, active in the CMS NPPES registry since June 2, 2015.
## Identity
- **NPI:** 1457731747 (Entity type: Individual)
- **Enumerated:** June 2, 2015
- **Primary specialty:** Family Medicine · taxonomy 207Q00000X
- **State license:** A146947 (California)
- **Sole proprietor:** No
## Practice location
- **Address:** 11420 WARNER AVE, Fountain Valley, CA 92708-2529
- **Phone:** (714) 549-1300 · **Fax:** (714) 665-4606
## 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:** 4 organizations under Medicare reassignment (form CMS-855R): Memorialcare Medical Foundation (NPI 1205167350, Fountain Valley, CA); University Of California Irvine (NPI 1851325906, Santa Ana, CA); Regents Of The University Of (NPI 1366590762, Orange, CA); Regents Of The University Of California (NPI 1679521850, Orange, CA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Other, class of 2015
## Record status
- **NPPES last updated:** January 31, 2019
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Source: [NPI Profile](https://npiprofile.com/npi/1457731747) · Data from the CMS NPPES public registry.