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Internal Medicine - Rheumatology Specialists in Orange, CA

Browse 20 Internal Medicine - Rheumatology providers listed in NPPES with a practice address in Orange, California.

20 Healthcare Providers

How Orange compares with the U.S.

Orange has 14 clinicians in Internal Medicine - Rheumatology per 100,000 residents, 6.1 times the U.S. rate of 2.4.

That is 20 active clinicians in Internal Medicine - Rheumatology with a practice address in Orange, for a population of 138,266.

The California rate is 2.4 per 100,000 residents.

What these numbers mean

Clinicians per 100,000 residents compares places of different sizes. We count active clinicians who list a practice address in the area in the federal NPI registry (NPPES) and divide by the number of people who live there, according to the U.S. Census Bureau. The U.S. rate is the same calculation for the whole country.

A higher number does not mean it is easier to get an appointment, that wait times are shorter, or that care is better. It also does not show how many clinicians are accepting new patients or which insurance plans they take. A lower number does not by itself mean there is a shortage.

City counts use the city name in each clinician's practice address. That postal city can cover a larger or smaller area than the city limits the Census Bureau uses for population, and many clinicians list only one address even if they work in several places. Cities with hospitals or large medical centers often list more specialists than the number of residents alone would suggest, because patients also come from nearby areas.

100% of clinicians in Internal Medicine - Rheumatology in Orange listed in the CMS Medicare file (12 of 12) accept Medicare assignment. That is similar to the California share of 95%.

What is Medicare assignment?

A clinician who accepts Medicare assignment agrees to take the Medicare-approved amount as full payment for services that Original Medicare covers. You usually still pay your deductible and coinsurance. This comes from the CMS Doctors and Clinicians file and applies to Original Medicare only. Medicare Advantage plans have their own provider networks. It does not show whether a clinician is taking new patients.

Some clinicians are listed as "may accept assignment," which means they can decide case by case. Clinicians without an assignment flag, or who are not in the CMS file, are not counted as accepting assignment. That does not mean they refuse Medicare. Ask the office before your visit.

83% of clinicians in Internal Medicine - Rheumatology in Orange listed in the CMS Medicare file (10 of 12) have a CMS telehealth indicator, meaning their recent Medicare claims include telehealth services. That is higher than the California share of 71%.

About the telehealth indicator

The telehealth indicator comes from CMS. It marks clinicians whose recent paid Medicare claims include services delivered by telehealth. It means a clinician has provided some services by telehealth, not that every visit can be done online. A clinician without the indicator may still offer telehealth, for example to patients who are not on Medicare. Ask the office which visits can be done by video or phone.

These figures summarize public federal data. They do not measure quality of care, appointment availability, or whether a clinician accepts your insurance or new patients. Registry addresses can be out of date. Please confirm details directly with the office and your plan. This information is not medical advice.

Prepared by T-MedInfo from NPPES, CMS and U.S. Census Bureau data. Questions or corrections: support@true-medinfo.com ยท Methodology

Sources: Clinician counts and practice addresses: NPPES NPI Registry, Centers for Medicare & Medicaid Services (CMS), data as of August 2026. Medicare assignment and telehealth indicators: CMS Doctors and Clinicians National Downloadable File. Population: U.S. Census Bureau, American Community Survey 2020-2024 5-Year Estimates, Table B01003 (Total Population).

Internal Medicine - Rheumatology Medicare (PECOS) Enrollment & Ordering Eligibility

Medicare enrollment and order/referring eligibility listed by CMS for Internal Medicine - Rheumatology practitioners in Orange, CA

Source: CMS PECOS
PECOS Enrolled Specialists 18 In Orange, CA
Part B Lab & Imaging Eligible 17 Diagnostic Referrals
DME Ordering Eligible 17 Durable Medical Equipment
Home Health Agency Referrals 17 HHA Ordering Eligible
Showing 1โ€“20 of 20 providers
With recent CMS data first, then Aโ€“Z

Dr. Tun Tun Aung , DO

Internal Medicine - Rheumatology

Active NPI Status
333 City Blvd W Ste 400, Orange, CA 928682994
Phone: 7149076138
NPI Identifier 1922676824
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Caroline Bui

Internal Medicine - Rheumatology

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
101 The City Dr S, Orange, CA 928683201
Phone: 7144568888
NPI Identifier 1821626482
View Full Profile

Dr. Ian Chang , DO

Internal Medicine - Rheumatology

Active NPI Status
101 The City Dr S Bldg 30, Orange, CA 928683201
Phone: 7144567720
NPI Identifier 1407116411
View Full Profile

Neha Chaurasia

Internal Medicine - Rheumatology

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
101 The City Dr S Ste 400, Orange, CA 928683201
Phone: 7144565691
NPI Identifier 1457980211
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Dr. Michael Cheng , DO

Internal Medicine - Rheumatology

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
101 The City Dr S, Orange, CA 928683201
Phone: 7144567110
NPI Identifier 1003109513
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Dr. Sheetal Ramesh Desai , MD

Internal Medicine - Rheumatology

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
101 The City Dr S, Orange, CA 928683201
Phone: 7144568068
NPI Identifier 1699966861
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Dr. Mehrnaz Hojjati , MD

Internal Medicine - Rheumatology

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
2501 E Chapman Ave Ste 301, Orange, CA 928693204
Phone: 7146283230
NPI Identifier 1720029135
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Dr. Bao Quynh N. Huynh , MD

Internal Medicine - Rheumatology

Active NPI Status Accepts Medicare Assignment
2501 E. Chapman Ave, # 303, Orange, CA 92869
Phone: 7146283128
NPI Identifier 1538313648
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Dr. Priyanka Iyer , MBBS, MPH

Internal Medicine - Rheumatology

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
101 The City Dr S, Orange, CA 928683201
Phone: 7148807812
NPI Identifier 1245662055
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Dr. Behnam Khaleghi , MD

Internal Medicine - Rheumatology

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
805 W La Veta Ave, Suite 105, Orange, CA 928683901
Phone: 7146289342
NPI Identifier 1154306678
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Dr. Soo Yeon Kim , MD

Internal Medicine - Rheumatology

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
101 The City Dr S, Orange, CA 928683201
Phone: 7144568888
NPI Identifier 1407484520
View Full Profile

Dr. Joo-Hyung Lee , MD

Internal Medicine - Rheumatology

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
1010 W La Veta Ave Ste 360, Orange, CA 928684300
Phone: 7142450492
NPI Identifier 1306891346
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Dr. Joshua Lee , MD

Internal Medicine - Rheumatology

Active NPI Status
1010 W La Veta Ave Ste 360, Orange, CA 928684303
Phone: 7142450492
NPI Identifier 1063974764
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Dr. Andrew Chuong Phan , MD

Internal Medicine - Rheumatology

Active NPI Status Accepts Medicare Assignment
2501 E Chapman Ave, Orange, CA 928693204
Phone: 7146283322
NPI Identifier 1710164736
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Dr. Thomas R Powell , MD

Internal Medicine - Rheumatology

Active NPI Status
1140 W La Veta Ave Ste 106, Orange, CA 928684223
Phone: 7142450492
NPI Identifier 1790742054
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Dr. Nicole Ridolfi , DO

Internal Medicine - Rheumatology

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
101 The City Dr S, Orange, CA 928683298
Phone: 7144567890
NPI Identifier 1477916633
View Full Profile

Dr. Nishitha Shekhar , DO

Internal Medicine - Rheumatology

Active NPI Status
101 The City Dr S, Orange, CA 928683201
Phone: 7144567890
NPI Identifier 1326671959
View Full Profile

Dr. Brian S Andrews , MD

Internal Medicine - Rheumatology

Active NPI Status
Uci Medical Center, 101 The City Drive South, Orange, CA 92868
Phone: 7144568978
NPI Identifier 1609970292
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Dr. George V Lawry , MD

Internal Medicine - Rheumatology

Active NPI Status
101 The City Dr S, Orange, CA 928683201
Phone: 7144567662
NPI Identifier 1043208994
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Dr. Tejal Thakkar , MD

Internal Medicine - Rheumatology

Active NPI Status
101 The City Dr S, Department Of Rheumatology, Orange, CA 928683201
Phone: 7145068373
NPI Identifier 1902069438
View Full Profile

Frequently Asked Questions about Internal Medicine - Rheumatology in Orange

How do I check a Internal Medicine - Rheumatology practitioner's license?

Each practitioner profile shows the NUCC taxonomy code and any state license number the practitioner reported to NPPES, plus a link to the California licensing board lookup. NPPES entries are self-reported; current license status is published only by the state board.

Why is a practitioner missing from this list?

This list shows NPI records that are active in NPPES. A deactivated NPI keeps its profile with the deactivation date and practice history; find it with the site search by name or NPI number.