HealthcareDiscovery.AI / Doctors / California / Colton / Internal Medicine

Internal Medicine in Colton, California

Data updated monthly · Last refresh September 2026

68 Internal Medicine providers practice in Colton, and 47% received drug or device company payments in 2025. Listings are drawn from federal public records and are not endorsements.

Internal Medicine providers in Colton

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. Abdulhaadi Khan, MD
Colton, CA · $354 in drug and device payments (2025) · (909) 580-1000
Dr. Adegbemisola Daniyan
Colton, CA · No drug or device payments recorded (2025) · (909) 566-2751
Dr. Alexander Phan, MD
Colton, CA · $1,229 in drug and device payments (2025) · (909) 580-1000
Dr. Amelia Henninger, MD
Colton, CA · $236 in drug and device payments (2025) · Telehealth · (909) 580-1000
Dr. Andrew Sorensen, DO
Colton, CA · No drug or device payments recorded (2025) · (909) 580-6343
Dr. Ankur Bhagat
Colton, CA · $618 in drug and device payments (2025) · (909) 580-1000
Dr. Anthony Enenmoh, MD
Colton, CA · No drug or device payments recorded (2025) · (909) 580-1000
Dr. Anthony Rajasingham, MD
Colton, CA · No drug or device payments recorded (2025) · (909) 580-1000
Dr. Arkady Hovssepian
Colton, CA · No drug or device payments recorded (2025) · (909) 580-1000
Dr. Arturo Santiago Vazquez, M.D.
Colton, CA · $25 in drug and device payments (2025) · (909) 370-4100
Dr. Badran Madani, MD
Colton, CA · No drug or device payments recorded (2025) · (909) 886-3660
Dr. Bahareh Maknouni
Colton, CA · $262 in drug and device payments (2025) · (909) 580-1000
Dr. Brandon Johnston, MD
Colton, CA · $336 in drug and device payments (2025) · (909) 580-6343
Dr. Brian Nielsen, DO
Colton, CA · No drug or device payments recorded (2025) · (909) 580-1000
Dr. Buzand Oganesian
Colton, CA · $147 in drug and device payments (2025) · (909) 580-1000
Dr. Calvin Duong, M.D.
Colton, CA · No drug or device payments recorded (2025) · (909) 370-4100
Dr. Catherine Sherman, D.O.
Colton, CA · No drug or device payments recorded (2025) · (909) 580-1000
Dr. Cecilia Katz, MD
Colton, CA · No drug or device payments recorded (2025) · (909) 580-1000
Dr. Chayanne Khosravi
Colton, CA · $1,375 in drug and device payments (2025) · (909) 580-1000
Dr. Daniel Chang, M.S., M.D.
Colton, CA · No drug or device payments recorded (2025) · (714) 262-6963
Dr. David Pena
Colton, CA · $20 in drug and device payments (2025) · (909) 580-1000
Dr. David Yetenikyan, MD
Colton, CA · $126 in drug and device payments (2025) · (909) 580-6343
Dr. Douglas Hay, MD
Colton, CA · No drug or device payments recorded (2025) · (909) 370-4100
Dr. Emmeline Kuo, DO
Colton, CA · $131 in drug and device payments (2025) · (909) 580-1000
Dr. Essam Nagori, D.O.
Colton, CA · $1,435 in drug and device payments (2025) · (909) 580-6343
Dr. Gilbert Chen, MD
Colton, CA · No drug or device payments recorded (2025) · (909) 580-6343
Dr. Haroon Azhand, MD
Colton, CA · No drug or device payments recorded (2025) · (909) 580-6343
Dr. Henrik Ghantarchyan, MD
Colton, CA · $559 in drug and device payments (2025) · (909) 580-1000
Dr. Hootan Mehr, MD
Colton, CA · No drug or device payments recorded (2025) · (909) 580-1000
Dr. Ireny Ibrahim, MD
Colton, CA · $25 in drug and device payments (2025) · (909) 370-4179
Dr. James Ericson, MD
Colton, CA · No drug or device payments recorded (2025) · (909) 580-6267
Dr. Janie Hu, MD
Colton, CA · $756 in drug and device payments (2025) · (909) 580-1000
Dr. Jennifer Mullins, DO
Colton, CA · No drug or device payments recorded (2025) · (909) 580-1000
Dr. Ji Yeon Park, DO
Colton, CA · $25 in drug and device payments (2025) · (909) 580-6266
Dr. Julian Choi
Colton, CA · $38 in drug and device payments (2025) · (909) 580-6266
Dr. Justin Hoang, DO
Colton, CA · No drug or device payments recorded (2025) · Telehealth · (909) 580-1000
Dr. Kambiz Raoufi, MD
Colton, CA · $34 in drug and device payments (2025) · (909) 580-1000
Dr. Karanjodh Johal, D.O
Colton, CA · No drug or device payments recorded (2025) · (909) 580-6266
Dr. Katherine Bourbeau-medinilla, MD
Colton, CA · $28 in drug and device payments (2025) · (909) 580-1000
Dr. Katlin Wieselthier, DO
Colton, CA · No drug or device payments recorded (2025) · (909) 580-1000
Dr. Kristina Dhillon
Colton, CA · No drug or device payments recorded (2025) · (909) 580-6266
Dr. Mark Robinson, MD
Colton, CA · No drug or device payments recorded (2025) · (909) 580-1000
Dr. Mohammad Shahid Khan, MD
Colton, CA · No drug or device payments recorded (2025) · (909) 580-1000
Dr. Molly Schechter
Colton, CA · $209 in drug and device payments (2025) · (909) 580-2159
Dr. Mufadda Hasan, M.D.
Colton, CA · $545 in drug and device payments (2025) · (626) 628-5227
Dr. Neeka Shayan
Colton, CA · No drug or device payments recorded (2025) · Telehealth · (909) 580-6266
Dr. Nicolas Thor, MD
Colton, CA · $201 in drug and device payments (2025) · (909) 580-1000
Dr. Niki Mohammadi
Colton, CA · $126 in drug and device payments (2025) · (909) 580-0100
Dr. Paul Lopez, M.D.
Colton, CA · $1,135 in drug and device payments (2025) · (213) 705-1555
Dr. Qiu Hua Wan, D.O.
Colton, CA · $88 in drug and device payments (2025) · (909) 580-1728

Conditions Internal Medicine providers in Colton, 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 Colton, California?

There are 68 Internal Medicine providers with active NPI records practicing in Colton, according to federal NPPES data refreshed monthly.

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

32 of 68 (47%) 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 Colton treat?

Internal Medicine providers in Colton 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 Colton 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.