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Internal Medicine in Santa Ana, California

Data updated monthly · Last refresh September 2026

54 Internal Medicine providers practice in Santa Ana, and 43% received drug or device company payments in 2025. Listings are drawn from federal public records and are not endorsements.

Internal Medicine providers in Santa Ana

Listed alphabetically. Payment figures come from the federal Open Payments program, which requires drug and device companies to report what they pay physicians for consulting, speaking, meals, travel and royalties. A disclosed payment is a financial relationship, not evidence of wrongdoing, and many totals reflect a single meal. Figures cover calendar year 2025.

Dr. Ajay Meka, M.D.
Santa Ana, CA · $121 in drug and device payments (2025) · Telehealth · (714) 979-5734
Dr. Alan Ross, MD
Santa Ana, CA · $51 in drug and device payments (2025) · (714) 755-0224
Dr. Alan Schwartz, MD
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 918-3070
Dr. Alex Hashemi, MD
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 502-3553
Dr. Ali Shahverdiani, M.D.
Santa Ana, CA · $434 in drug and device payments (2025) · Telehealth · (714) 352-5800
Dr. Archana Shah, MD
Santa Ana, CA · $19 in drug and device payments (2025) · (714) 835-8501
Dr. Athena Alexander, M.D.
Santa Ana, CA · $20 in drug and device payments (2025) · (714) 352-2911
Dr. Boris Trifunovic, M.D. PHD
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 427-7800
Dr. Bruce Tagle, MD
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 633-5038
Dr. Chia Ying Wang, MD
Santa Ana, CA · No drug or device payments recorded (2025) · (888) 988-2800
Dr. Christopher Ried, M.D.
Santa Ana, CA · $21 in drug and device payments (2025) · (714) 834-8598
Dr. Christopher Zimmerman, MD, MPH
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 834-5037
Dr. Dara Saghafi, MD
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 835-9147
Dr. David Maclachlan, MD
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 544-7175
Dr. Diane Kim, MD
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 288-3230
Dr. Frank Badin, M.D.
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 972-8818
Dr. Ghalib Wahidi, M.D.
Santa Ana, CA · $209 in drug and device payments (2025) · Telehealth · (949) 422-0615
Dr. Hai Nguyen, M.D.
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 675-3937
Dr. Hamendra Rana, MD
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 547-6278
Dr. Hammam Kemeh, M.D.
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 352-2911
Dr. Hassan Aliakbarian, MD
Santa Ana, CA · $194 in drug and device payments (2025) · (714) 352-5800
Dr. Hidenori Ikuhara, M.D.
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 954-0432
Dr. Hima Natla, M.D.
Santa Ana, CA · No drug or device payments recorded (2025) · Telehealth · (714) 929-2300
Dr. Hung-min Sung, M.D.
Santa Ana, CA · $250 in drug and device payments (2025) · (714) 754-0310
Dr. Huu Nguyen, M.D.
Santa Ana, CA · $496 in drug and device payments (2025) · (714) 957-0040
Dr. Iyad Houshan, M.D.
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 619-8777
Dr. Jamshid Tamiry, M.D.
Santa Ana, CA · No drug or device payments recorded (2025) · (949) 721-8482
Dr. Jane Curtis, M.D.
Santa Ana, CA · $407 in drug and device payments (2025) · Telehealth · (714) 541-3001
Dr. John Feng, MD
Santa Ana, CA · No drug or device payments recorded (2025) · (888) 789-9585
Dr. Julie Low, MD
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 834-8243
Dr. Kelvin Mai, DO
Santa Ana, CA · $6,240 in drug and device payments (2025) · Telehealth · (714) 332-1069
Dr. Khai Do, M.D.
Santa Ana, CA · $2,371 in drug and device payments (2025) · (909) 621-3012
Dr. Madhavi Mulye, M.D.
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 424-0800
Dr. Meena Meka, M.D.
Santa Ana, CA · No drug or device payments recorded (2025) · Telehealth · (714) 979-5734
Dr. Nabil Gemayel
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 543-0709
Dr. Navneet Singh, D.O.
Santa Ana, CA · $2,344 in drug and device payments (2025) · Telehealth · (714) 542-1331
Dr. Pelma Tabrizi, M.D.
Santa Ana, CA · $92 in drug and device payments (2025) · Telehealth · (714) 884-4855
Dr. Quang Vo, MD
Santa Ana, CA · $129 in drug and device payments (2025) · (714) 317-4998
Dr. Quy Nguyen, M.D.
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 834-8017
Dr. Richard Bock, M.D.
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 542-3581
Dr. Robert Castro, DO
Santa Ana, CA · $1,025 in drug and device payments (2025) · (714) 754-1684
Dr. Robin Hatam, D.O.
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 929-2300
Dr. Ronnie Alas, M.D.
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 929-2300
Dr. Samer Moghaddam, M.D.
Santa Ana, CA · $583 in drug and device payments (2025) · (949) 705-8485
Dr. Sam Nakamura, M.D.
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 623-2383
Dr. Sashini Weeraman, MD
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 999-9999
Dr. Thai Nguyen, M.D.
Santa Ana, CA · $1,502 in drug and device payments (2025) · (714) 775-8090
Dr. Theresa Thanh Nguyen, M.D.
Santa Ana, CA · $1,666 in drug and device payments (2025) · (714) 775-8090
Dr. Tiffany Prachachalerm, DO
Santa Ana, CA · $294 in drug and device payments (2025) · (714) 954-0432
Dr. Trung Pham, MD
Santa Ana, CA · No drug or device payments recorded (2025) · (714) 559-3846

Conditions Internal Medicine providers in Santa Ana, California commonly treat

Patients often search by condition rather than specialty. These are conditions typically managed by Internal Medicine providers. Individual practices vary, so confirm with the provider before booking.

Common questions

How many Internal Medicine providers are in Santa Ana, California?

There are 54 Internal Medicine providers with active NPI records practicing in Santa Ana, according to federal NPPES data refreshed monthly.

How many Internal Medicine providers in Santa Ana received drug or device company payments?

23 of 54 (43%) received at least one payment from a drug or device company in 2025, according to the federal Open Payments program.

What conditions do Internal Medicine providers in Santa Ana treat?

Internal Medicine providers in Santa Ana commonly treat high blood pressure, type 2 diabetes, high cholesterol, preventive care, chronic disease management and related conditions. Individual practices vary, so confirm with the provider before booking.

Where does this data come from?

Provider records come from the federal NPPES registry and CMS Doctors and Clinicians files. Payment figures come from the CMS Open Payments program for calendar year 2025. The directory refreshes monthly.

All specialties in Santa Ana Internal Medicine across California

Try a city like Tucson, a zip like 85016, or a specialty like psychiatry. For a doctor by name, use the full search.
Sources: NPPES (CMS), Doctors and Clinicians national files, CMS Open Payments 2025. Updated monthly. Records are public federal data and are not verified credentials, licensure checks, or endorsements. This directory is informational and not medical advice. How we build this directory.