Internal Medicine Providers in Santa Ana, CA
Browse 54 Internal Medicine providers listed in NPPES with a practice address in Santa Ana, California.
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
Dr. Ronnie Alas , MD
Internal Medicine
Dr. Athena Theresa Alexander , MD
Internal Medicine
Dr. Hassan Aliakbarian , MD
Internal Medicine
Dr. Frank Badin , MD
Internal Medicine
Dr. Robert M Castro , DO
Internal Medicine
Dr. Jane Diana Curtis , MD
Internal Medicine
Dr. Khai Do , MD
Internal Medicine
Dr. John Feng , MD
Internal Medicine
Dr. Alex Hashemi , MD
Internal Medicine
Dr. Robin Arash Hatam , DO
Internal Medicine
Dr. Wesam G Houshan , MD
Internal Medicine
Dr. Hidenori Mutsuo Ikuhara , MD
Internal Medicine
Dr. Hammam Ghiyas Kemeh , MD
Internal Medicine
Dr. Diane Kim , MD
Internal Medicine
Dr. Dai Trang Thi Le , MD
Internal Medicine
Dr. Kelvin Mai , DO
Internal Medicine
Dr. Ajay G Meka , MD
Internal Medicine
Dr. Meena Kumari Meka , MD
Internal Medicine
Dr. Samer Moghaddam , MD
Internal Medicine
Dr. Madhavi Sudhakar Mulye , MD
Internal Medicine
Frequently Asked Questions about Internal Medicine in Santa Ana
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.
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.
Other Specialties in Santa Ana
- Student in an Organized Health Care Education/Training Program 188
- Pharmacist 184
- Dentist - General Practice 150
- Physical Therapist 128
- Dentist 125
- Physician Assistant 124
- Nurse Practitioner - Family 113
- Psychologist - Clinical 87
- Occupational Therapist 69
- Optometrist 64
- Nurse Practitioner - Psychiatric/Mental Health 57
- Specialist 53
Internal Medicine Providers in Other California Cities
Cities with the most listed practitioners first.