Addiction Medicine Doctors (Internal Medicine) in California
Data updated monthly · Last refresh October 2026
72 Addiction Medicine (Internal Medicine) providers practice in California, including 15 (21%) offering telehealth. The largest concentration is in Los Angeles. 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.
72providers
15telehealth
Los Angelestop city
Addiction Medicine (Internal Medicine) by city in California
Choose a city to see providers there.
Where Addiction Medicine Doctors (Internal Medicine) in California practice
From CMS Medicare enrollment records covering 26 of the 72 providers listed here (36%). Providers who do not bill Medicare are not included in these figures.
Largest practice groups
| Group (as registered with Medicare) | Addiction Medicine Doctors (Internal Medicine) | All clinicians in group | Main city |
| Southern California Permanente Medical Group | 3 | 11,250 | Fontana |
| Permanente Medical Group Inc. | 2 | 10,928 | Fremont |
| The Regents of the University of California | 2 | 1,426 | Los Angeles |
| Eisenhower Medical Center | 2 | 462 | Cathedral City |
Hospitals where they hold privileges
| Hospital | City | Ownership | CMS star rating | Addiction Medicine Doctors (Internal Medicine) affiliated |
| Ronald Reagan UCLA Medical Center | Los Angeles | Government | 4 of 5 | 2 |
| Providence Little Co of Mary Med Ctr San Pedro | San Pedro | Nonprofit | 4 of 5 | 2 |
| Eisenhower Medical Center | Rancho Mirage | For-profit | 4 of 5 | 2 |
| Cedars-Sinai Medical Center | Los Angeles | Nonprofit | 5 of 5 | 2 |
Sources: CMS Doctors and Clinicians (August 2026) and Facility Affiliation files (August 2026); hospital ownership type and overall star rating from CMS Hospital General Information (July 2026). A clinician in several groups is counted once, in the largest group they bill through. Ownership type is what the hospital reports to CMS; it does not show private equity or other investor ownership. How we build this directory.
Addiction Medicine (Internal 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. Geoffrey Booth, M.D.Agoura Hills, CA · No drug or device payments recorded (2025) ·
(310) 801-0092 Dr. Richard Scatterday, M.D.Anaheim, CA · No drug or device payments recorded (2025) ·
(714) 778-0368 Dr. Kenneth Starr, M.D.Arroyo Grande, CA · $9,707 in drug and device payments (2025) ·
(805) 242-1360 Dr. Jonathan Reitman, M.D.Beverly Hills, CA · $1,525 in drug and device payments (2025) ·
(310) 360-7690 Dr. Mark Honzel, M.D.Beverly Hills, CA · $5,231 in drug and device payments (2025) · Telehealth ·
(310) 360-7690 Dr. Kristopher Howalt, MDCanoga Park, CA · $119 in drug and device payments (2025) ·
(805) 459-2250 Dr. Benjamin Milam, MDCathedral City, CA · No drug or device payments recorded (2025) · Telehealth ·
(760) 773-4300 Dr. Eduardo Javier, MDCathedral City, CA · $600 in drug and device payments (2025) · Telehealth ·
(760) 773-4300 Dr. Mutahir Farhan, MDCorona, CA · No drug or device payments recorded (2025) · Telehealth ·
(951) 497-3749 Dr. Robert Treuherz, MDCrestline, CA · No drug or device payments recorded (2025) ·
(909) 273-8779 Dr. Daniel Aronow, M.D.Culver City, CA · No drug or device payments recorded (2025) ·
(310) 558-2108 Dr. Susan Weinstock, MDDel Mar, CA · $127 in drug and device payments (2025) ·
(858) 794-9706 Dr. Douglas Richards, MDFontana, CA · No drug or device payments recorded (2025) ·
(909) 427-3910 Dr. Eugene Caine, MDFontana, CA · No drug or device payments recorded (2025) ·
(909) 427-3910 Dr. Sean Koon, MDFontana, CA · No drug or device payments recorded (2025) ·
(909) 427-3910 Dr. Steven Valenti, MDFontana, CA · No drug or device payments recorded (2025) ·
(909) 427-3910 Dr. Farhad Mahjouri, MD, MPHFresno, CA · No drug or device payments recorded (2025) ·
(559) 266-9581 Dr. Mark Towns, M.D.Galt, CA · No drug or device payments recorded (2025) ·
(209) 744-9909 Dr. Virginia Schaaf, M.D.Greenbrae, CA · No drug or device payments recorded (2025) ·
(415) 448-1500 Dr. Richard Merrick, MDHarbor City, CA · No drug or device payments recorded (2025) ·
(310) 325-5111 Dr. Jan Brink, M.D.Hesperia, CA · No drug or device payments recorded (2025) ·
(760) 956-2462 Dr. Aury Holtzman, M.D.Huntington Beach, CA · No drug or device payments recorded (2025) ·
(714) 842-4946 Dr. Courtney Scott, M.D.Inglewood, CA · $69 in drug and device payments (2025) ·
(310) 673-6581 Dr. Steven Shifflett, MDLakeport, CA · No drug or device payments recorded (2025) ·
(707) 262-5000 Dr. Mihran Ask, MDLoma Linda, CA · No drug or device payments recorded (2025) ·
(909) 825-7084 Dr. Jonathan Quach, M.DLos Angeles, CA · No drug or device payments recorded (2025) · Telehealth ·
(310) 207-0117 Dr. Kumar Vasudevan, M.D.Los Angeles, CA · No drug or device payments recorded (2025) ·
(310) 206-6232 Dr. Mahesh Bhuta, M.D.Los Angeles, CA · No drug or device payments recorded (2025) ·
(310) 559-9884 Dr. Maya Appley, MDLos Angeles, CA · No drug or device payments recorded (2025) · Telehealth ·
(310) 206-6232 Dr. Ololade Saliu, MDLos Angeles, CA · $140 in drug and device payments (2025) ·
(562) 867-7999 Dr. Ariella Morrow, MD, MPHMalibu, CA · No drug or device payments recorded (2025) ·
(310) 456-1603 Dr. William Stanley, MDMalibu, CA · No drug or device payments recorded (2025) ·
(310) 341-0188 Dr. Barbara Bruton, M.D.Marina Del Rey, CA · No drug or device payments recorded (2025) · Telehealth ·
(424) 384-3432 Dr. Anthony Albanese, M.D.Mather, CA · $8,116 in drug and device payments (2025) ·
(916) 366-5451 Dr. Dallas Dick, M.D.Moreno Valley, CA · No drug or device payments recorded (2025) ·
(951) 486-4000 Dr. Raphi Hambartzhumian, MDMurrieta, CA · No drug or device payments recorded (2025) ·
(951) 477-6591 Dr. Susan Ferguson, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 451-4270 Dr. Blanca Trevino-scatterday, MDOrange, CA · No drug or device payments recorded (2025) ·
(714) 748-6226 Dr. John Gerard, M.D.Palm Springs, CA · $125 in drug and device payments (2025) ·
(760) 286-9946 Dr. Joshua HoPalo Alto, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 498-9111 Dr. Sina Radparvar, MDPanorama City, CA · No drug or device payments recorded (2025) ·
(818) 375-2000 Dr. Natalia Orihuela, MDPlacerville, CA · No drug or device payments recorded (2025) ·
(530) 621-7700 Dr. John Daliva, DOPomona, CA · $225 in drug and device payments (2025) · Telehealth ·
(909) 865-9500 Dr. Kyle Moore, M.D.Richmond, CA · $685 in drug and device payments (2025) ·
(510) 232-0874 Dr. Gawtham Gutta, MDRidgecrest, CA · No drug or device payments recorded (2025) · Telehealth ·
(760) 446-3551 Common questions
How many Addiction Medicine (Internal Medicine) providers are in California?There are 72 Addiction Medicine (Internal Medicine) providers with active NPI records practicing in California, according to federal NPPES data refreshed monthly.
Do Addiction Medicine (Internal Medicine) providers in California offer telehealth?Yes. 15 of the 72 Addiction Medicine (Internal Medicine) providers in California (about 21%) report offering telehealth services in CMS data.
Which cities in California have the most Addiction Medicine (Internal Medicine) providers?Los Angeles (5), Fontana (4), Malibu (3) have the highest concentration of Addiction Medicine (Internal Medicine) providers in California.
How many Addiction Medicine (Internal Medicine) providers in California received drug or device company payments?26 of 72 Addiction Medicine (Internal Medicine) providers in California (36%) 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.
Which hospitals do Addiction Medicine Doctors (Internal Medicine) in California work at?According to CMS facility affiliation records, the California hospitals where the most Addiction Medicine Doctors (Internal Medicine) hold privileges are Ronald Reagan UCLA Medical Center in Los Angeles; Providence Little Co of Mary Med Ctr San Pedro in San Pedro; Eisenhower Medical Center in Rancho Mirage.
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