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CAROLINE BUI
NPI 1821626482
Internal Medicine - Rheumatology in Orange, CA

Active since March 30, 2020PECOS EnrolledAccepts Medicare Assignment
101 THE CITY DR S, ORANGE, CA 92868(714) 456-8888 Get Directions Write a Review

NPPES record last updated: December 11, 2025. Verified against the NPPES registry weekly; last sync: August 16, 2026.

Record update history: Dec 11, 2025, Mar 30, 2020 (2 updates tracked since 2020).

About Caroline Bui NPPES

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

CAROLINE BUI (NPI 1821626482) is an individual rheumatology provider in Orange, California, licensed in California (20A20843) and active in the NPI registry since March 2020. She is enrolled in Medicare PECOS and is a graduate of Touro Un College Of Osteopathic Medicine, Vallejo (2020).

NPPES Registry Identity

NPI1821626482
Entity TypeIndividualFemale
Primary Taxonomy207RR0500X
Provider Legal NameCAROLINE BUI
Location Address101 THE CITY DR SOrange, CA 92868-3201
Mailing Address101 The City Dr SOrange, CA 92868-3201 · (714) 456-8888
Phone(714) 456-8888
Sole ProprietorNo
Medical School CMSTouro Un College Of Osteopathic Medicine, VallejoGraduated 2020
Enumeration DateMarch 30, 2020
Last NPPES UpdateDecember 11, 20252 updates tracked since enumeration
NPPES CertifiedDecember 11, 2025
✔ NPI 1821626482 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · RheumatologyAllopathic & Osteopathic Physicians
Taxonomy Code207RR0500X
License✔ Licensed in CA · 20A20843
Definition
An internist who treats diseases of joints, muscle, bones and tendons. This specialist diagnoses and treats arthritis, back pain, muscle strains, common athletic injuries and collagen diseases.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
101 THE CITY DR S, Orange, CA 92868
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Caroline Bui 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.

PECOS PAC ID7618467952
PECOS Enrollment IDI20251105004335
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.

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
$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 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 Caroline Bui's NPI number?

The NPI number for Caroline Bui is 1821626482. It was assigned to this individual provider in the NPPES registry on March 30, 2020.

Where is Caroline Bui located?

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

What is Caroline Bui's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Rheumatology, with taxonomy code 207RR0500X.

Is Caroline Bui enrolled in Medicare?

Yes. Caroline Bui 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.

When was this NPI record last updated?

The NPPES record for Caroline Bui was last updated on December 11, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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.