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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

THU ANNE MAI
NPI 1750918843
Internal Medicine - Gastroenterology in Fullerton, CA

Active since March 26, 2020PECOS Enrolled
1837 SUNNY CREST DR, FULLERTON, CA 92835(714) 446-5831 Get Directions Write a Review

NPPES record last updated: October 15, 2026. Verified against the NPPES registry weekly; last sync: November 01, 2026.

Record update history: Oct 15, 2026, Sep 23, 2020, Mar 26, 2020 (3 updates tracked since 2020).

About Thu Anne Mai NPPES

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

THU ANNE MAI (NPI 1750918843) is an individual gastroenterology provider in Fullerton, California, licensed in California (A187040) 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

NPI1750918843
Entity TypeIndividualFemale
Primary Taxonomy207RG0100X
Provider Legal NameTHU ANNE MAI
Location Address1837 SUNNY CREST DRFullerton, CA 92835-3616
Mailing Address1200 N. State Street Clinic Tower, Suite A7dLos Angeles, CA 90033-1029
Phone(714) 446-5831
Sole ProprietorNo
Enumeration DateMarch 26, 2020
Last NPPES UpdateOctober 15, 20263 updates tracked since enumeration
NPPES CertifiedOctober 15, 2026
✔ NPI 1750918843 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians
Taxonomy Code207RG0100X
License✔ Licensed in CA · A187040
Definition
An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
1837 SUNNY CREST DR, Fullerton, CA 92835
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Other Names 1

Other Name (5)Thu Anne Mai

Secondary Practice Location 1

Location 11200 N State Street Clinic Tower, Suite A7DLos Angeles, CA 90033 · Phone (323) 409-7556

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Thu Anne Mai 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 Reassignment

Medicare enrollment records show Thu Anne Mai reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Southern California Permanente Medical Group
1.8 mi
Health Maintenance Organization
1893 W MALVERN AVE
Fullerton, CA 92833
  • Reassigned Medicare billing, California enrollment
  • 13,921 clinicians in this Medicare group
NPI 1336556059 (877) 608-0044

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 92835 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
$109.96 typical visit price
range $20.84 – $153.61
Typical copayment $27.49 (range $5.21 – $38.40)
Most-billed visit code 99214
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 9

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

KUMKUM SARKAR PATEL M.D., MPH
Internal Medicine (Gastroenterology)
1837 SUNNY CREST DR
FULLERTON, CA 92835
Orange County (714) 446-5831
ERICA LEE NP
Nurse Practitioner (Family)
1837 SUNNY CREST DR
FULLERTON, CA 92835
Orange County (714) 446-5831
MAICA DE VERA JAVIEN NP-C
Nurse Practitioner (Family)
1837 SUNNY CREST DR
FULLERTON, CA 92835
Orange County (714) 446-5831
MARTIN CARR M.D.
Internal Medicine (Gastroenterology)
1837 SUNNY CREST DR
FULLERTON, CA 92835
Orange County (714) 446-5831
DR. SAJEN MATHEWS MD
Internal Medicine (Gastroenterology)
1837 SUNNY CREST DR
FULLERTON, CA 92835
Orange County (714) 446-5831
JILL OLMSTEAD N.P.
Nurse Practitioner
1837 SUNNY CREST DR
FULLERTON, CA 92835
Orange County (714) 446-5831
DR. PATRICK KOO MD
Internal Medicine (Gastroenterology)
1837 SUNNY CREST DR
FULLERTON, CA 92835
Orange County (714) 446-5831
DR. EUGENE JAY YOON M.D.
Internal Medicine (Gastroenterology)
1837 SUNNY CREST DR
FULLERTON, CA 92835
Orange County (714) 446-5831

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 Thu Anne Mai's NPI number?

The NPI number for Thu Anne Mai is 1750918843. It was assigned to this individual provider in the NPPES registry on March 26, 2020.

Where is Thu Anne Mai located?

Thu Anne Mai practices at 1837 Sunny Crest Dr, Fullerton, CA 92835. The listed phone number is (714) 446-5831.

What is Thu Anne Mai's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Is Thu Anne Mai enrolled in Medicare?

Yes. Thu Anne Mai is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Thu Anne Mai's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Thu Anne Mai reassigns Medicare benefits to Southern California Permanente Medical Group (Fullerton, CA). The 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 Thu Anne Mai'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 Thu Anne Mai was last updated on October 15, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 24 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.