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Internal Medicine Providers in Santa Ana, CA

Browse 54 Internal Medicine providers listed in NPPES with a practice address in Santa Ana, California.

54 Healthcare Providers

How Santa Ana compares with the U.S.

Santa Ana has 17 clinicians in Internal Medicine per 100,000 residents, about 39% of the U.S. rate of 44.

That is 54 active clinicians in Internal Medicine with a practice address in Santa Ana, for a population of 312,534.

The California rate is 45 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.

94% of clinicians in Internal Medicine in Santa Ana listed in the CMS Medicare file (30 of 32) 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.

34% of clinicians in Internal Medicine in Santa Ana listed in the CMS Medicare file (11 of 32) 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 Santa Ana, CA

Source: CMS PECOS
PECOS Enrolled Specialists 40 In Santa Ana, CA
Part B Lab & Imaging Eligible 40 Diagnostic Referrals
DME Ordering Eligible 40 Durable Medical Equipment
Home Health Agency Referrals 40 HHA Ordering Eligible
Showing 1โ€“20 of 54 providers
With recent CMS data first, then Aโ€“Z

Dr. Ronnie Alas , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
3501 S Harbor Blvd, Santa Ana, CA 927046919
Phone: 7149292300
NPI Identifier 1306267026
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Dr. Athena Theresa Alexander , MD

Internal Medicine

Active NPI Status
1206 E 17th St Ste 101, Santa Ana, CA 927012641
Phone: 7143522911
NPI Identifier 1225417322
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Dr. Hassan Aliakbarian , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
520 N Main St Ste 120, Santa Ana, CA 927014623
Phone: 7143525800
NPI Identifier 1164050399
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Dr. Frank Badin , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
999 N Tustin Ave, Suite 103, Santa Ana, CA 927056504
Phone: 7149728818
NPI Identifier 1962562850
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Dr. Robert M Castro , DO

Internal Medicine

Active NPI Status Accepts Medicare Assignment
2621 S Bristol St, Suite 108, Santa Ana, CA 927045766
Phone: 7147541684
NPI Identifier 1285777813
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Dr. Jane Diana Curtis , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
720 N Tustin Ave Ste 103, Santa Ana, CA 927053606
Phone: 7145413001
NPI Identifier 1518018217
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Dr. Khai Do , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
2021 E 4th St Ste 104, Santa Ana, CA 927053912
Phone: 9096213012
NPI Identifier 1396939526
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Dr. John Feng , MD

Internal Medicine

Active NPI Status
3401 W Sunflower Ave Ste 100, Santa Ana, CA 92704
Phone: 8887899585
NPI Identifier 1346660081
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Dr. Alex Hashemi , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
520 N Main St, Santa Ana, CA 927014623
Phone: 7145023553
NPI Identifier 1275161184
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Dr. Robin Arash Hatam , DO

Internal Medicine

Active NPI Status
3501 S Harbor Blvd, Santa Ana, CA 927046919
Phone: 7149292300
NPI Identifier 1194053785
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Dr. Wesam G Houshan , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
3401 W Sunflower Ave Ste 250, Santa Ana, CA 92704
Phone: 7149921182
NPI Identifier 1356467112
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Dr. Hidenori Mutsuo Ikuhara , MD

Internal Medicine

Active NPI Status
1212 W 17th St, Santa Ana, CA 927063418
Phone: 7149540432
NPI Identifier 1598889750
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Dr. Hammam Ghiyas Kemeh , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1206 E 17th St Ste 101, Santa Ana, CA 927012641
Phone: 7143522911
NPI Identifier 1912137639
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Dr. Diane Kim , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
2212 E 4th St, Santa Ana, CA 927053870
Phone: 7142883230
NPI Identifier 1598824252
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Dr. Dai Trang Thi Le , MD

Internal Medicine

Active NPI Status
550 N Flower St, Santa Ana, CA 927032361
Phone: 7146476092
NPI Identifier 1770046831
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Dr. Kelvin Mai , DO

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
1002 N Fairview St, Santa Ana, CA 927031811
Phone: 7143321069
NPI Identifier 1326072612
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Dr. Ajay G Meka , MD

Internal Medicine

Active NPI Status Telehealth Services Available
2740 S Bristol St, Suite 208, Santa Ana, CA 927046209
Phone: 7149795734
NPI Identifier 1063527976
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Dr. Meena Kumari Meka , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
2740 S Bristol St Ste 208, Santa Ana, CA 927046233
Phone: 7149795734
NPI Identifier 1013338722
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Dr. Samer Moghaddam , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
902 N Grand Ave, Santa Ana, CA 927014218
Phone: 9497058485
NPI Identifier 1275700478
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Dr. Madhavi Sudhakar Mulye , MD

Internal Medicine

Active NPI Status
1132 S Bristol St, Santa Ana, CA 927043420
Phone: 7144240800
NPI Identifier 1205056470
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Frequently Asked Questions about Internal Medicine in Santa Ana

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.