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Internal Medicine - Infectious Diseases in Orange, CA

Browse 23 Internal Medicine - Infectious Disease providers listed in NPPES with a practice address in Orange, California.

23 Healthcare Providers

How Orange compares with the U.S.

Orange has 17 clinicians in Internal Medicine - Infectious Disease per 100,000 residents, 5.2 times the U.S. rate of 3.2.

That is 23 active clinicians in Internal Medicine - Infectious Disease with a practice address in Orange, for a population of 138,266.

The California rate is 2.9 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.

94% of clinicians in Internal Medicine - Infectious Disease in Orange listed in the CMS Medicare file (17 of 18) accept Medicare assignment. That is similar to the California share of 96%.

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.

56% of clinicians in Internal Medicine - Infectious Disease in Orange listed in the CMS Medicare file (10 of 18) have a CMS telehealth indicator, meaning their recent Medicare claims include telehealth services. That is higher than the California share of 44%.

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 - Infectious Disease Medicare (PECOS) Enrollment & Ordering Eligibility

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

Source: CMS PECOS
PECOS Enrolled Specialists 21 In Orange, CA
Part B Lab & Imaging Eligible 21 Diagnostic Referrals
DME Ordering Eligible 22 Durable Medical Equipment
Home Health Agency Referrals 21 HHA Ordering Eligible
Showing 1โ€“20 of 23 providers
With recent CMS data first, then Aโ€“Z

Dr. Rosa Mercedes Andrade , MD

Internal Medicine - Infectious Disease

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
101 The City Dr S Bldg 29, Orange, CA 928683201
Phone: 7144567720
NPI Identifier 1093919680
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Dr. Robert Charles Armen , MD

Internal Medicine - Infectious Disease

Active NPI Status
845 W La Veta Ave, 107a, Orange, CA 928683930
Phone: 7142897171
NPI Identifier 1225041080
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Dr. Gina Askar , MD

Internal Medicine - Infectious Disease

Active NPI Status
101 The City Dr S, Orange, CA 928683201
Phone: 7144568888
NPI Identifier 1376168468
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Dr. Emily Blodget , MD, MB, BCH, BAO

Internal Medicine - Infectious Disease

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
101 The City Dr S, Orange, CA 928683201
Phone: 7148807812
NPI Identifier 1033379268
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Dr. Thomas C Cesario , MD

Internal Medicine - Infectious Disease

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
Uci Medical Center, 101 The City Drive South, Orange, CA 92868
Phone: 7144568978
NPI Identifier 1265512354
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Dr. Catherine Diamond , MD

Internal Medicine - Infectious Disease

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
Uci Medical Center, 101 The City Drive South, Orange, CA 92868
Phone: 7144568978
NPI Identifier 1649350786
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Dr. Donald N Forthal , MD

Internal Medicine - Infectious Disease

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
Uci Medical Center, 101 The City Drive South, Orange, CA 92868
Phone: 7144568978
NPI Identifier 1215017363
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Dr. Shruti Gohil , MD, MPH

Internal Medicine - Infectious Disease

Active NPI Status Accepts Medicare Assignment
101 The City Dr S, University Of California Irvine, Orange, CA 928683201
Phone: 7144567016
NPI Identifier 1851375398
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Dr. Geeta K Gupta , MD

Internal Medicine - Infectious Disease

Active NPI Status
Uci Medical Center, 101 The City Drive South, Orange, CA 92868
Phone: 7144568978
NPI Identifier 1558441600
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Dr. Peter Heseltine , MD, FACP

Internal Medicine - Infectious Disease

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
200 S Manchester Ave, Suite 514, Orange, CA 928683217
Phone: 7147736702
NPI Identifier 1487771432
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Dr. Victor Y Hsu , MD

Internal Medicine - Infectious Disease

Active NPI Status Accepts Medicare Assignment
845 W La Veta Ave, 107a, Orange, CA 928683930
Phone: 7142897171
NPI Identifier 1609889484
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Dr. Susan Shih Huang , MD

Internal Medicine - Infectious Disease

Active NPI Status Accepts Medicare Assignment
101 The City Dr S, Orange, CA 928683201
Phone: 7148807812
NPI Identifier 1346207651
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Dr. Edward C Jones-Lopez , MD

Internal Medicine - Infectious Disease

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
101 The City Dr S, Orange, CA 928683201
Phone: 7144568888
NPI Identifier 1558392704
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Dr. Sean Hp Jung , MD

Internal Medicine - Infectious Disease

Active NPI Status Accepts Medicare Assignment
101 The City Dr S, Orange, CA 928683201
Phone: 7144567890
NPI Identifier 1215592076
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Dr. Hannah Hyochan Nam , MD

Internal Medicine - Infectious Disease

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
101 The City Dr S, Orange, CA 928683201
Phone: 7144568000
NPI Identifier 1477829190
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Dr. Theodore Robertson Pak , MD, PhD

Internal Medicine - Infectious Disease

Active NPI Status Accepts Medicare Assignment
101 The City Dr S, Orange, CA 928683201
Phone: 7144568888
NPI Identifier 1013476100
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Dr. Steven T Park , MD

Internal Medicine - Infectious Disease

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
101 The City Dr S, Orange, CA 928683201
Phone: 7144568068
NPI Identifier 1033144928
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Dr. Sayan Deb Ray , MD

Internal Medicine - Infectious Disease

Active NPI Status Accepts Medicare Assignment
845 W La Veta Ave, 107a, Orange, CA 928683930
Phone: 7142897171
NPI Identifier 1881607653
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Dr. Tulika Singh , MD, MS, AAHIVS

Internal Medicine - Infectious Disease

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
101 The City Dr S, Orange, CA 928683201
Phone: 7144568888
NPI Identifier 1467692947
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Dr. Anastasia Weiland , MD

Internal Medicine - Infectious Disease

Active NPI Status Accepts Medicare Assignment
101 The City Drive South, Orange, CA 928683201
Phone: 8004653203
NPI Identifier 1104449834
View Full Profile

Frequently Asked Questions about Internal Medicine - Infectious Disease in Orange

How do I check a Internal Medicine - Infectious Disease 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.