Caroline Bui
Rheumatology Physician · Orange, CA
Caroline Bui is a rheumatology physician with a practice address in Orange, California, and NPI 1821626482, issued on Mar 30, 2020. Check the license (California 20A20843, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Caroline Bui
- Primary taxonomy
- Rheumatology Physician 207RR0500X
- License number
- 20A20843 CA
Self-reported in NPPES; status is on the state search - Practice location
- 101 The City Dr S, Orange, CA 92868
- Phone
- (714) 456-8888
- Enumerated
- Mar 30, 2020
- Record last updated
- Dec 11, 2025
- Medicare enrollment
- Enrolled (PECOS I20251105004335); accepts Medicare assignment
- Medical or professional school
- Touro Un College Of Osteopathic Medicine, Vallejo, 2020
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest rheumatology physician records → All 926 in California → Look up another NPI →
Also registered at 101 The City Dr S
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Danny Abad, PAPhysician Assistant1477158673
- Edward AbaradoStudent in an Organized Health Care Education/Training Program1912855198
- Nagina Abdiani, DOGeriatric Medicine (Family Medicine) Physician1518543271
- Mariam Abdul-Latif, M.D.Pediatrics Physician1538418884
- Eric AbelloOtolaryngology Physician1922566215
- Brandon Abeyta, MDAnesthesiology Physician1841291804
Verify Caroline Bui in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license 20A20843Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
92% fewer Medicare Part D claims than the average rheumatology physician in 2024
159 Medicare Part D claims for 47 beneficiaries, against an average of 1,978 among the 6,301 providers of this specialty who prescribed in Part D. Brand-name drugs were 24% of claims.
Most prescribed
- Hydroxychloroquine Sulfate26 claims
- Methotrexate25 claims
- Enbrel Sureclick13 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $771.08
19 payments; by number, the most common kind was food and beverage; the largest payer was Amgen Inc. The 4,486 providers of this specialty with any payment received $8,538.33 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- UC RegentsOrange, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Caroline Bui among 926 rheumatology physician records in California
Caroline Bui is one of 926 rheumatology physician records with a practice address in California. 81% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2020, is newer than 95% of them.
- NPI issued2020 · 95% of these records are older, 2% newer
- In a Medicare fileYes · 81% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2020 · median 2003 among the 641 with a school on file
- Record last updated2025 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RR0500X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Rheumatology Physician providers in California
There are 926 rheumatology physician records in California.
All 926 in California → Every provider in Orange → Rheumatology Physician nationwide →
The 8 rheumatology physician records with the nearest ZIP codes
- Brian S Andrews, MDOrange, CA 928681609970292
- Ian Chang, D.O.Orange, CA 928681407116411
- Michael Cheng, DOOrange, CA 928681003109513
- Sheetal Desai, MDOrange, CA 928681699966861
- Priyanka Iyer, M.B.B.S, M.P.HOrange, CA 928681245662055
- Behnam Khaleghi, MDOrange, CA 928681154306678
- George Lawry, MDOrange, CA 928681043208994
- Joo-Hyung Lee, MDOrange, CA 928681306891346
Common questions
What is Caroline Bui's NPI number?
Caroline Bui's National Provider Identifier (NPI) is 1821626482, issued on Mar 30, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Caroline Bui located?
The NPPES record lists a practice address at 101 The City Dr S, Orange, CA, 92868. Phone: (714) 456-8888. Providers update this record themselves, so call before visiting.
How can I verify Caroline Bui's license?
NPPES lists California license number 20A20843, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Caroline Bui prescribe under Medicare Part D?
In 2024, Caroline Bui had 159 Medicare Part D claims for 47 beneficiaries; the average among rheumatology physician prescribers was 1,978. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.