Addiction Medicine Doctors (Family Medicine) in California
Data updated monthly · Last refresh October 2026
129 Addiction Medicine (Family Medicine) providers practice in California, including 19 (15%) offering telehealth. The largest concentration is in Ventura. Profiles include federal Open Payments records of money received from drug and device companies in 2025. Listings are drawn from federal public records and are not endorsements.
129providers
19telehealth
Venturatop city
Addiction Medicine (Family Medicine) by city in California
Choose a city to see providers there.
Addiction Medicine (Family Medicine) providers in California
Listed by city, largest first. 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. Parker Duncan Diaz, MD, MPH, FAAFPSanta Rosa, CA · No drug or device payments recorded (2025) ·
(707) 547-2222 Dr. Stephanie Castillo, MDSan Ysidro, CA · $166 in drug and device payments (2025) ·
(619) 662-4100 Dr. Michael Chiarottino, M.D.Sausalito, CA · No drug or device payments recorded (2025) ·
(415) 331-2113 Dr. Sirisat Khalsa, M.D.Sherman Oaks, CA · $453 in drug and device payments (2025) ·
(310) 954-5315 Dr. Ariana Abid, MDStanford, CA · $185 in drug and device payments (2025) ·
(650) 723-4000 Dr. Sandeep Mann, MDStockton, CA · No drug or device payments recorded (2025) ·
(209) 851-2065 Dr. Eugene Santillano, MDSunnyvale, CA · $129 in drug and device payments (2025) ·
(408) 337-6383 Dr. Hamed Haghnazar, MD, MPH Dr. Warren Yamashita, MD, MPH Dr. Alexander Howard, DOVentura, CA · $227 in drug and device payments (2025) ·
(805) 652-6228 Dr. Christopher Fernandez, DOVentura, CA · $148 in drug and device payments (2025) · Telehealth ·
(805) 658-5800 Dr. Deepkiran SinghVentura, CA · No drug or device payments recorded (2025) ·
(805) 652-6100 Dr. Elizabeth Simoneit, MD Dr. Jose Velasquez, MDVentura, CA · $140 in drug and device payments (2025) ·
(805) 652-6298 Dr. Lorenz Choi, DOVentura, CA · $417 in drug and device payments (2025) ·
(805) 652-6100 Dr. Matthew Lamon, DOVentura, CA · $226 in drug and device payments (2025) · Telehealth ·
(805) 652-6100 Dr. Morgan Kirkpatrick, MDVentura, CA · $544 in drug and device payments (2025) ·
(805) 652-6228 Dr. Nataliya Panivska, DOVentura, CA · No drug or device payments recorded (2025) ·
(805) 948-5672 Dr. Olivia NguyenVentura, CA · $288 in drug and device payments (2025) ·
(805) 652-6000 Dr. Oluwatumininu Oludemi, DOVentura, CA · $305 in drug and device payments (2025) ·
(805) 652-6100 Dr. Tipu Khan, M.D.Ventura, CA · $50,870 in drug and device payments (2025) · Telehealth ·
(805) 652-6100 Dr. Zachary Zwolak, D.O.Ventura, CA · $292 in drug and device payments (2025) · Telehealth ·
(805) 652-6100 Dr. Alexandra Arenson, DOWalnut Creek, CA · No drug or device payments recorded (2025) ·
(925) 295-4145 Dr. Belis Aladag, MD, MPH, FASAMWalnut Creek, CA · No drug or device payments recorded (2025) · Telehealth ·
(800) 892-2695 Dr. Katrina Groves-rehwaldt, MDWalnut Creek, CA · No drug or device payments recorded (2025) ·
(800) 892-2695 Dr. Tamer Rezk, MDWhittier, CA · $26 in drug and device payments (2025) · Telehealth ·
(562) 698-0811 Common questions
How many Addiction Medicine (Family Medicine) providers are in California?There are 129 Addiction Medicine (Family Medicine) providers with active NPI records practicing in California, according to federal NPPES data refreshed monthly.
Do Addiction Medicine (Family Medicine) providers in California offer telehealth?Yes. 19 of the 129 Addiction Medicine (Family Medicine) providers in California (about 15%) report offering telehealth services in CMS data.
Which cities in California have the most Addiction Medicine (Family Medicine) providers?Ventura (13), Loma Linda (10), Los Angeles (6) have the highest concentration of Addiction Medicine (Family Medicine) providers in California.
How many Addiction Medicine (Family Medicine) providers in California received drug or device company payments?56 of 129 Addiction Medicine (Family Medicine) providers in California (43%) received at least one payment from a drug or device company in 2025, according to the federal Open Payments program.
Where does this data come from?Provider counts and profiles 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.
Do most Addiction Medicine Doctors (Family Medicine) in California work in independent practices or large health systems?Among 62 Addiction Medicine Doctors (Family Medicine) in California enrolled in Medicare, 23% bill through a solo or small practice with fewer than 10 clinicians, 24% through a mid-size group of 10 to 99, and 53% through a large group or health system with 100 or more clinicians, according to CMS enrollment records.
Which hospitals do Addiction Medicine Doctors (Family Medicine) in California work at?According to CMS facility affiliation records, the California hospitals where the most Addiction Medicine Doctors (Family Medicine) hold privileges are Ventura County Medical Center in Ventura; Hoag Memorial Hospital Presbyterian in Newport Beach; Community Memorial Hospital - Ventura in Ventura.
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