Infectious Disease Specialists in California
Data updated monthly · Last refresh October 2026
1,121 Infectious Disease providers practice in California, including 322 (29%) 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.
1,121providers
322telehealth
Los Angelestop city
Infectious Disease by city in California
Choose a city to see providers there.
Infectious Disease 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. Ritika PrasadSan Jose, CA · No drug or device payments recorded (2025) · Telehealth ·
(408) 885-5110 Dr. Robert Stiller, MDSan Jose, CA · No drug or device payments recorded (2025) ·
(408) 972-7000 Dr. Shaurya Sharma, MBBS MDSan Jose, CA · $26 in drug and device payments (2025) ·
(408) 885-5000 Dr. Stephenie LeSan Jose, CA · No drug or device payments recorded (2025) · Telehealth ·
(408) 885-5000 Dr. Connie Park, MDSan Leandro, CA · $296 in drug and device payments (2025) ·
(510) 454-2700 Dr. Eileen Nenninger, MDSan Leandro, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 463-1318 Dr. Jeffrey Klausner, MDSan Leandro, CA · $3,306 in drug and device payments (2025) · Telehealth ·
(510) 984-2489 Dr. Jeffrey Silvers, M.D.San Leandro, CA · $110 in drug and device payments (2025) ·
(510) 895-0388 Dr. Nicholas Moss, MDSan Leandro, CA · No drug or device payments recorded (2025) ·
(510) 268-7635 Dr. Richard Shen, M.D.San Leandro, CA · No drug or device payments recorded (2025) · Telehealth ·
(925) 463-1318 Dr. Christopher Holland, M.D.San Luis Obispo, CA · No drug or device payments recorded (2025) ·
(805) 540-0689 Dr. Gregory Canfield, M.D., PH.D.San Luis Obispo, CA · No drug or device payments recorded (2025) ·
(805) 543-4407 Dr. Hayley ClevelandSan Luis Obispo, CA · No drug or device payments recorded (2025) · Telehealth ·
(805) 549-8023 Dr. Jethro Ritter, D.O.San Luis Obispo, CA · No drug or device payments recorded (2025) ·
(805) 540-0689 Dr. Bouke Dejong, MDSan Mateo, CA · No drug or device payments recorded (2025) ·
(650) 573-2222 Dr. Cybele RenaultSan Mateo, CA · No drug or device payments recorded (2025) ·
(650) 573-2222 Dr. Dennis IsraelskiSan Mateo, CA · $27 in drug and device payments (2025) ·
(650) 573-2222 Dr. Elizabeth Hudson, DOSan Mateo, CA · No drug or device payments recorded (2025) ·
(650) 573-2222 Dr. Jeanne Linquist, M.D.San Mateo, CA · No drug or device payments recorded (2025) ·
(650) 573-2750 Dr. Karen Relucio, MDSan Mateo, CA · No drug or device payments recorded (2025) ·
(650) 573-2222 Dr. Lisa Gooze, MDSan Mateo, CA · No drug or device payments recorded (2025) ·
(650) 573-2222 Dr. Shefali Talwar, M.D.San Mateo, CA · No drug or device payments recorded (2025) ·
(650) 897-4554 Dr. Vivian Levy, MDSan Mateo, CA · No drug or device payments recorded (2025) ·
(650) 573-2222 Dr. Catherine Treseler, MDSan Rafael, CA · No drug or device payments recorded (2025) ·
(415) 444-2000 Dr. David Witt, MDSan Rafael, CA · No drug or device payments recorded (2025) ·
(415) 444-2000 Dr. James Heffelfinger, M.D.San Rafael, CA · No drug or device payments recorded (2025) ·
(154) 481-5004 Dr. Mary Ellen Guroy, MDSan Rafael, CA · No drug or device payments recorded (2025) ·
(415) 473-4400 Dr. Rehan Syed, MD, MSCSan Rafael, CA · No drug or device payments recorded (2025) ·
(415) 444-2619 Dr. William Joseph, M.D.San Ramon, CA · No drug or device payments recorded (2025) ·
(925) 277-2050 Dr. Helene Calvet, M.D.Santa Ana, CA · No drug or device payments recorded (2025) ·
(714) 834-5518 Dr. Hon Yu, MDSanta Ana, CA · No drug or device payments recorded (2025) ·
(714) 210-2450 Dr. Marianne Go-wheeler, M.D.Santa Ana, CA · $413 in drug and device payments (2025) ·
(714) 664-0045 Dr. Michael Fitzgibbons, MDSanta Ana, CA · $813 in drug and device payments (2025) · Telehealth ·
(714) 541-3744 Dr. Nicholas NguyenSanta Ana, CA · $91 in drug and device payments (2025) ·
(714) 664-0045 Dr. Puneet Chahal, MDSanta Ana, CA · $288 in drug and device payments (2025) ·
(714) 664-0045 Dr. Roma Patel, M.D.Santa Ana, CA · $635 in drug and device payments (2025) ·
(714) 664-0045 Dr. Ronald Sherman, MDSanta Ana, CA · No drug or device payments recorded (2025) ·
(714) 834-7991 Dr. Tuan Ta, MDSanta Ana, CA · $746 in drug and device payments (2025) · Telehealth ·
(714) 664-0045 Dr. Andrea Zambrano, MDSanta Barbara, CA · $1,741 in drug and device payments (2025) · Telehealth ·
(805) 898-3022 Dr. Anil Jagtiani, M.D.Santa Barbara, CA · No drug or device payments recorded (2025) ·
(805) 569-7315 Dr. Barry Statner, MDSanta Barbara, CA · $218 in drug and device payments (2025) · Telehealth ·
(805) 682-7111 Dr. David Fisk, MDSanta Barbara, CA · $122 in drug and device payments (2025) ·
(805) 245-9062 Dr. Jessica So, MD, MS, MPHSanta Barbara, CA · $1,003 in drug and device payments (2025) · Telehealth ·
(805) 898-3558 Dr. Lynn Fitzgibbons, M.D.Santa Barbara, CA · $273 in drug and device payments (2025) ·
(805) 569-7315 Dr. Mary-louise Scully, M.D.Santa Barbara, CA · $494 in drug and device payments (2025) · Telehealth ·
(805) 681-1761 Dr. Stephen Hosea, MDSanta Barbara, CA · $123 in drug and device payments (2025) ·
(805) 682-3610 Dr. William Hahn, M.D.Santa Barbara, CA · $89 in drug and device payments (2025) ·
(805) 569-7315 Dr. Eva Mortensen, MDSanta Clara, CA · No drug or device payments recorded (2025) ·
(408) 236-6400 Dr. Jonathan Blum, MDSanta Clara, CA · No drug or device payments recorded (2025) ·
(408) 851-1000 Dr. Mark Lillo, MDSanta Clara, CA · No drug or device payments recorded (2025) ·
(408) 851-1000 Conditions Infectious Disease providers in California commonly treat
Patients often search by condition rather than specialty. These are conditions typically managed by Infectious Disease providers. Individual practices vary, so confirm with the provider before booking.
- Long COVID
- HIV care
- Lyme disease
- Recurrent infections
- Travel medicine
Common questions
How many Infectious Disease providers are in California?There are 1,121 Infectious Disease providers with active NPI records practicing in California, according to federal NPPES data refreshed monthly.
Do Infectious Disease providers in California offer telehealth?Yes. 322 of the 1,121 Infectious Disease providers in California (about 29%) report offering telehealth services in CMS data.
Which cities in California have the most Infectious Disease providers?Los Angeles (145), San Francisco (108), San Diego (76) have the highest concentration of Infectious Disease providers in California.
How many Infectious Disease providers in California received drug or device company payments?419 of 1,121 Infectious Disease providers in California (37%) received at least one payment from a drug or device company in 2025, according to the federal Open Payments program.
What conditions do Infectious Disease providers in California treat?Infectious Disease providers commonly treat long COVID, HIV care, Lyme disease, recurrent infections, travel medicine and related conditions. Individual practices vary, so confirm with the provider before booking.
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 Infectious Disease Specialists in California work in independent practices or large health systems?Among 717 Infectious Disease Specialists in California enrolled in Medicare, 26% bill through a solo or small practice with fewer than 10 clinicians, 7% through a mid-size group of 10 to 99, and 68% through a large group or health system with 100 or more clinicians, according to CMS enrollment records.
Which hospitals do Infectious Disease Specialists in California work at?According to CMS facility affiliation records, the California hospitals where the most Infectious Disease Specialists hold privileges are Stanford Health Care in Stanford; UCSF Medical Center in San Francisco; Ronald Reagan UCLA Medical Center in Los Angeles.
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