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Internal Medicine - Nephrology Specialists in Orange, CA

Browse 33 Internal Medicine - Nephrology providers listed in NPPES with a practice address in Orange, California.

33 Healthcare Providers

How Orange compares with the U.S.

Orange has 24 clinicians in Internal Medicine - Nephrology per 100,000 residents, 5.9 times the U.S. rate of 4.0.

That is 33 active clinicians in Internal Medicine - Nephrology with a practice address in Orange, for a population of 138,266.

The California rate is 3.7 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 - Nephrology in Orange listed in the CMS Medicare file (24 of 24) 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.

63% of clinicians in Internal Medicine - Nephrology in Orange listed in the CMS Medicare file (15 of 24) have a CMS telehealth indicator, meaning their recent Medicare claims include telehealth services. That is similar to the California share of 59%.

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 - Nephrology Medicare (PECOS) Enrollment & Ordering Eligibility

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

Source: CMS PECOS
PECOS Enrolled Specialists 29 In Orange, CA
Part B Lab & Imaging Eligible 29 Diagnostic Referrals
DME Ordering Eligible 30 Durable Medical Equipment
Home Health Agency Referrals 29 HHA Ordering Eligible
Showing 1โ€“20 of 33 providers
With recent CMS data first, then Aโ€“Z

Dr. Rebecca Ahdoot , MD

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
101 The City Dr S, Orange, CA 928683201
Phone: 7148807812
NPI Identifier 1851735211
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Dr. Fawaz Saeed Omar Al Ammary , MD

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment
101 The City Dr S Bldg 29, Orange, CA 928683201
Phone: 7144567002
NPI Identifier 1992918916
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Dr. Cyril H Barton , MD

Internal Medicine - Nephrology

Active NPI Status
Uci Medical Center, 101 The City Drive South, Orange, CA 92868
Phone: 7144568978
NPI Identifier 1588744668
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Dr. Yongen Chang , MD, PhD

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
101 The City Dr S, Suite 400, Orange, CA 928683201
Phone: 7144567004
NPI Identifier 1932490034
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Dr. Stephanie S. Cheung , MD

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
101 The City Dr S, Orange, CA 928683201
Phone: 7144565142
NPI Identifier 1417136219
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Dr. Jason Albert Chou , MD

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
101 The City Dr S Ste 400, Orange, CA 928683201
Phone: 7144565142
NPI Identifier 1083051700
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Dr. Antoney Joseph Ferrey , MD

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment
101 The City Dr S, Orange, CA 928683201
Phone: 7148807812
NPI Identifier 1831458827
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Dr. Anum Hamiduzzaman , MD

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
101 The City Dr S, Orange, CA 928683201
Phone: 7144568888
NPI Identifier 1649681495
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Dr. Ramy Magdy Hanna , MD

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
101 The City Dr S, Orange, CA 928683201
Phone: 7148807812
NPI Identifier 1518150283
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Dr. Kevin Thomas Harley , MD

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment
101 The City Dr S, City Tower, Suite 400, Orange, CA 928683201
Phone: 7144565142
NPI Identifier 1194924100
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Dr. Jula Inrig , MD

Internal Medicine - Nephrology

Active NPI Status
101 The City Dr S, Orange, CA 928683201
Phone: 7148807812
NPI Identifier 1740393743
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Dr. Amer Emile Jabara , MD

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
705 W La Veta Ave Ste 107, Orange, CA 928684447
Phone: 7146394901
NPI Identifier 1760475701
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Dr. Kamyar Kalantar-Zadeh , MD

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment
101 The City Dr S, Orange, CA 928683201
Phone: 7148807812
NPI Identifier 1457314684
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Dr. Charles Jeffrey Kaupke , MD

Internal Medicine - Nephrology

Active NPI Status
705 W La Veta Ave Ste 107, Orange, CA 928684447
Phone: 7146394601
NPI Identifier 1770542920
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Dr. Thu Huy Le , MD

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
101 The City Dr S, Orange, CA 928683201
Phone: 7144568888
NPI Identifier 1396846317
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Jiten Prakash Mehta , D0

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
1310 W Stewart Dr Ste 210, Orange, CA 928683837
Phone: 7148364204
NPI Identifier 1861912289
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Dr. Payal Bansal Mittal , MD

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment
500 S Main St, Suite 101, Orange, CA 928684507
Phone: 7148364204
NPI Identifier 1306022678
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Dr. Michael Neinast , DO

Internal Medicine - Nephrology

Active NPI Status
101 The City Dr S, Orange, CA 928683201
Phone: 7144568888
NPI Identifier 1770105769
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Dr. Lawrence Nguyen , DO

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment
101 The City Dr S, Orange, CA 928683201
Phone: 7144567890
NPI Identifier 1932627874
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Dr. Madeleine V Pahl , MD

Internal Medicine - Nephrology

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
Uci Medical Center, 101 The City Drive South, Orange, CA 92868
Phone: 7144568978
NPI Identifier 1992885131
View Full Profile

Frequently Asked Questions about Internal Medicine - Nephrology in Orange

How do I check a Internal Medicine - Nephrology 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.