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GENEVIEVE MAZZA MD
NPI 1487281408
Obstetrics & Gynecology in Orange, CA

Active since March 27, 2020PECOS Enrolled
101 THE CITY DR S, ORANGE, CA 92868(714) 456-8888 Get Directions Write a Review

NPPES record last updated: September 4, 2024. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Sep 4, 2024, Apr 30, 2024, Apr 14, 2024 and 1 more (4 updates tracked since 2020).

About Genevieve Mazza Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

GENEVIEVE MAZZA MD (NPI 1487281408) is an individual obstetrics & gynecology provider in Orange, California, licensed in California (A190631) and active in the NPI registry since March 2020. She is enrolled in Medicare PECOS and maintains a secondary practice location in Los Angeles.

NPPES Registry Identity

NPI1487281408
Entity TypeIndividualFemale
Primary Taxonomy207V00000X
Provider Legal NameGENEVIEVE MAZZACredential: MD
Location Address101 THE CITY DR SOrange, CA 92868-3201
Mailing Address200 S Manchester Ave Ste 300Orange, CA 92868-3219 · (714) 456-8888
Phone(714) 456-8888
Sole ProprietorYes
Enumeration DateMarch 27, 2020
Last NPPES UpdateSeptember 4, 20244 updates tracked since enumeration
NPPES CertifiedSeptember 4, 2024
✔ NPI 1487281408 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 3

★ Primary SpecialtyObstetrics & GynecologyAllopathic & Osteopathic Physicians
Taxonomy Code207V00000X
License✔ Licensed in CA · A190631
Definition
An obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproductive system and associated disorders. This physician serves as a consultant to other physicians and as a primary physician for women.
Also ListedObstetrics & Gynecology · Maternal & Fetal MedicineTaxonomy 207VM0101X · License A190631 (CA)
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
101 THE CITY DR S, Orange, CA 92868
Open in Google Maps ↗

Secondary Practice Location 1

Location 11200 North State Street, Inpatient Tower, C3F107Los Angeles, CA 90033-1029 · Phone (323) 409-8848

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Genevieve Mazza Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

3

Medicare enrollment records show Genevieve Mazza reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Regents Of The University Of California
0.1 mi
Obstetrics & Gynecology
101 CITY DRIVE SOUTH, BLDG 56 SUITE 800
Orange, CA 92868
  • Reassigned Medicare billing, California enrollment
  • 149 clinicians in this Medicare group
NPI 1356304034 (714) 456-6431
University Of California Irvine
2.8 mi
Federally Qualified Health Center (FQHC)
800 N MAIN ST
Santa Ana, CA 92701
  • Reassigned Medicare billing, California enrollment
  • 255 clinicians in this Medicare group
NPI 1851325906 (714) 456-6785
Magella Medical Group, Inc.
17 mi
Maternal & Fetal Medicine
2888 LONG BEACH BLVD STE 400
Long Beach, CA 90806
  • Reassigned Medicare billing, California enrollment
  • 191 clinicians in this Medicare group
NPI 1376640086 (562) 997-8510

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.

New Patient
$142.39 typical visit price
range $62.96 – $187.60
Typical copayment $35.59 (range $15.74 – $46.90)
Most-billed visit code 99204
Established Patient
$77.96 typical visit price
range $20.84 – $153.61
Typical copayment $19.49 (range $5.21 – $38.40)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

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.

DR. ANKIT BHUPENDRA PATEL D.O.
Radiology (Diagnostic Radiology)
101 THE CITY DR S
ORANGE, CA 92868
Orange County (714) 456-5113
DR. LAURA CATHERINE SKOCZYLAS MD
Obstetrics & Gynecology
101 THE CITY DR S, BUILDING 56, DEPARTMENT OF OB/GYN
ORANGE, CA 92868
Orange County (714) 456-8224
MICHAEL CHENG DO
Internal Medicine (Rheumatology)
101 THE CITY DR S
ORANGE, CA 92868
Orange County (714) 456-7110
AESTHETIC AND PLASTIC SURGERY INSTITUTE
Plastic Surgery
101 THE CITY DR S
ORANGE, CA 92868
Orange County (714) 456-2986
JOSEPH VILLARREAL M.D.
Emergency Medicine
101 THE CITY DR S, BUILDING 1A, ROOM 1009
ORANGE, CA 92868
Orange County (714) 456-5239
DEMI TRAN
Psychiatry & Neurology (Neurology)
101 THE CITY DR S, CITY TOWER, SUITE 400
ORANGE, CA 92868
Orange County (171) 456-6693
DR. ISABEL CARLTON CLARK M.D.
Surgery (Trauma Surgery)
101 THE CITY DR S
ORANGE, CA 92868
Orange County (714) 456-7890
DYLAN LUKATO
Emergency Medicine
101 THE CITY DR S
ORANGE, CA 92868
Orange County (415) 218-8041

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 Genevieve Mazza's NPI number?

The NPI number for Genevieve Mazza is 1487281408. It was assigned to this individual provider in the NPPES registry on March 27, 2020.

Where is Genevieve Mazza located?

Genevieve Mazza practices at 101 The City Dr S, Orange, CA 92868. The listed phone number is (714) 456-8888.

What is Genevieve Mazza's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.

Is Genevieve Mazza enrolled in Medicare?

Yes. Genevieve Mazza is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Genevieve Mazza's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Genevieve Mazza reassigns Medicare benefits to 3 organizations: Regents Of The University Of California (Orange, CA), University Of California Irvine (Santa Ana, CA) and Magella Medical Group, Inc. (Long Beach, 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 Genevieve Mazza'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 Genevieve Mazza was last updated on September 4, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.