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Internal Medicine Providers in Tustin, CA

Browse 34 Internal Medicine providers listed in NPPES with a practice address in Tustin, California.

34 Healthcare Providers

How Tustin compares with the U.S.

Tustin has 43 clinicians in Internal Medicine per 100,000 residents, close to the U.S. rate of 44.

That is 34 active clinicians in Internal Medicine with a practice address in Tustin, for a population of 78,981.

That is close to the California rate of 45.

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.

94% of clinicians in Internal Medicine in Tustin 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.

39% of clinicians in Internal Medicine in Tustin listed in the CMS Medicare file (7 of 18) have a CMS telehealth indicator, meaning their recent Medicare claims include telehealth services. That is similar to the California share of 38%.

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 Medicare (PECOS) Enrollment & Ordering Eligibility

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

Source: CMS PECOS
PECOS Enrolled Specialists 24 In Tustin, CA
Part B Lab & Imaging Eligible 26 Diagnostic Referrals
DME Ordering Eligible 26 Durable Medical Equipment
Home Health Agency Referrals 26 HHA Ordering Eligible
Showing 1โ€“20 of 34 providers
With recent CMS data first, then Aโ€“Z

Dr. Lisa Beth Abdishoo , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1 Hope Dr, Tustin, CA 927820221
Phone: 7142470300
NPI Identifier 1881776326
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Dr. Mohamed Fekry Al-Sadek , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
14662 Newport Ave, Tustin, CA 927806064
Phone: 9493355656
NPI Identifier 1154353829
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Dr. Robert Frank Bader , MD

Internal Medicine

Active NPI Status
1 Hope Dr, Tustin, CA 927820221
Phone: 7142470300
NPI Identifier 1225111610
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Dr. Susan L Ban , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
17400 Irvine Blvd, Suite F, Tustin, CA 927803030
Phone: 7148385610
NPI Identifier 1053324970
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Dr. Bernard Leroy Bennett , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
661 W 1st St Ste G, Tustin, CA 927802939
Phone: 7146659890
NPI Identifier 1871568899
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Dr. Drumil Bhatt , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
1095 Irvine Blvd, Tustin, CA 927803526
Phone: 7146160506
NPI Identifier 1679033625
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Dr. Grace Chang Broderick , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
2521 Michelle Dr, Tustin, CA 927807014
Phone: 8889882800
NPI Identifier 1548525264
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Dr. Huong T Duong , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
17400 Irvine Blvd, Suite F, Tustin, CA 927803030
Phone: 7148385610
NPI Identifier 1013020437
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Dr. Daniel Eichinger , DO

Internal Medicine

Active NPI Status
1095 Irvine Blvd, Tustin, CA 927803526
Phone: 7145057110
NPI Identifier 1598724015
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Dr. Pin-Hung Hsieh , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
13522 Newport Ave Ste 102, Tustin, CA 927803707
Phone: 7145738200
NPI Identifier 1144323064
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Dr. Charlie Huang , DO

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
15000 Kensington Park Dr Ste 250, Tustin, CA 92782
Phone: 7144778320
NPI Identifier 1427591577
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Dr. Thomas C Hwang , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
17400 Irvine Blvd, Suite F, Tustin, CA 927803030
Phone: 7148385610
NPI Identifier 1124039722
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Dr. Tariq A Khan , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
14642 Newport Ave, Suite 408, Tustin, CA 927806091
Phone: 6572189859
NPI Identifier 1295925253
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Dr. Eric Khau , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
15000 Kensington Park Dr Ste 250, Tustin, CA 927821835
Phone: 7144778320
NPI Identifier 1437654134
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Active NPI Status
661 W 1st St Ste G, Tustin, CA 927802939
Phone: 7146659890
NPI Identifier 1164791265
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Dr. Anthony Pongwai Lam , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
2895 Edinger Ave, Tustin, CA 927807257
Phone: 9493815800
NPI Identifier 1659502839
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Dr. Jeremy Lam , MD

Internal Medicine

Active NPI Status Telehealth Services Available
2492 Walnut Ave Ste 100, Tustin, CA 927806953
Phone: 7147098000
NPI Identifier 1083140172
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Dr. Deepika Sajee Lekawa , MD

Internal Medicine

Active NPI Status
1451 Irvine Blvd, Tustin, CA 927803804
Phone: 7148388878
NPI Identifier 1437248846
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Dr. David A Mcdonough , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
12721 Newport Ave Ste 3, Tustin, CA 927808031
Phone: 3102885933
NPI Identifier 1295866341
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Dr. Julia Collins Motherway , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
17400 Irvine Blvd, Suite F, Tustin, CA 927803030
Phone: 7148385610
NPI Identifier 1962544494
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Frequently Asked Questions about Internal Medicine in Tustin

How do I check a Internal Medicine 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.