HealthcareDiscovery.AI / Doctors / California / Infectious Disease

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 in Los Angeles145 providers
Infectious Disease in San Francisco108 providers
Infectious Disease in San Diego76 providers
Infectious Disease in Stanford58 providers
Infectious Disease in Sacramento56 providers
Infectious Disease in Torrance26 providers
Infectious Disease in Orange23 providers
Infectious Disease in Fresno20 providers
Infectious Disease in Loma Linda18 providers
Infectious Disease in Walnut Creek18 providers
Infectious Disease in Long Beach17 providers
Infectious Disease in Pasadena16 providers
Infectious Disease in Palo Alto15 providers
Infectious Disease in La Jolla15 providers
Infectious Disease in Santa Monica14 providers
Infectious Disease in San Jose14 providers
Infectious Disease in Oakland13 providers
Infectious Disease in Newport Beach13 providers
Infectious Disease in Bakersfield11 providers
Infectious Disease in Pomona10 providers
Infectious Disease in San Mateo9 providers
Infectious Disease in Santa Ana9 providers
Infectious Disease in Santa Barbara9 providers
Infectious Disease in Modesto8 providers

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. Harkiran Grewal, MD
Castro Valley, CA · $174 in drug and device payments (2025) · (202) 444-0086
Dr. Steven Oppenheimer, MD
Castro Valley, CA · No drug or device payments recorded (2025) · (510) 566-8331
Dr. Jason Halperin, M.D.
Cathedral City, CA · $127 in drug and device payments (2025) · (760) 507-3310
Dr. Brian Courtney, M.D.
Chico, CA · $73 in drug and device payments (2025) · (530) 896-7455
Dr. Shawn Koura, M.D.
Chula Vista, CA · No drug or device payments recorded (2025) · (877) 256-2043
Dr. Deepthi Jayasekara, MD
Claremont, CA · $8,168 in drug and device payments (2025) · (626) 851-8880
Dr. Hua Jiang, MD
Claremont, CA · $591 in drug and device payments (2025) · (626) 851-8880
Dr. Karen Michelle Guiang, D.O.
Claremont, CA · $870 in drug and device payments (2025) · Telehealth · (626) 851-8880
Dr. Katrina Anne Sandejas, MD
Claremont, CA · No drug or device payments recorded (2025) · (626) 851-8880
Dr. Nasima Begum, MD
Claremont, CA · $883 in drug and device payments (2025) · (626) 851-8880
Dr. Sohanjeet Bassi, MD
Claremont, CA · $1,999 in drug and device payments (2025) · Telehealth · (626) 851-8880
Dr. Brianna Ray, D.O., M.P.H.
Colton, CA · $36 in drug and device payments (2025) · Telehealth · (909) 580-1000
Dr. Kuo-liang Huang, M.D.
Colton, CA · No drug or device payments recorded (2025) · (909) 580-6270
Dr. Juan Caeiro, M.D.
Commerce, CA · $975 in drug and device payments (2025) · (323) 869-5448
Dr. Maita Kuvhenguhwa, M.D.
Compton, CA · $124 in drug and device payments (2025) · (424) 529-6755
Dr. Aye Khyne, MD
Concord, CA · No drug or device payments recorded (2025) · Telehealth · (925) 671-7629
Dr. Ingrid Fernandes, M.D.
Concord, CA · No drug or device payments recorded (2025) · (925) 681-4100
Dr. Michael Ein, MD
Concord, CA · No drug or device payments recorded (2025) · (925) 753-1986
Dr. Firas Abubaker, MD
Corona, CA · $425 in drug and device payments (2025) · (973) 330-1940
Dr. Tejaskumar Naik, M.D.
Corona, CA · $187 in drug and device payments (2025) · (951) 372-0039
Dr. Rokhsareh Tajrishi, M.D.
Corona Del Mar, CA · No drug or device payments recorded (2025) · (714) 903-7767
Dr. Daniel Ehrensaft, MD
Culver City, CA · No drug or device payments recorded (2025) · (310) 202-9145
Dr. Isam Mawas, MD
Culver City, CA · No drug or device payments recorded (2025) · (310) 730-8606
Dr. Martha Sonnenberg, MD
Culver City, CA · No drug or device payments recorded (2025) · (310) 659-4384
Dr. Fabian Romero, M.D.
Daly City, CA · $3,535 in drug and device payments (2025) · (650) 991-5960
Dr. James Ziegenbein, M.D. A PROF CORP
Downey, CA · $171 in drug and device payments (2025) · (562) 862-0604
Dr. Lisa Chiang, M.D.
Downey, CA · No drug or device payments recorded (2025) · Telehealth · (562) 657-4684
Dr. Michelle Lebrun, M.D.
Downey, CA · $102 in drug and device payments (2025) · (909) 518-0735
Dr. Sandeep Bansil, M.D.
Downey, CA · No drug or device payments recorded (2025) · (562) 923-1211
Dr. Avneet Kaur, M.D.
Duarte, CA · $125 in drug and device payments (2025) · Telehealth · (626) 256-4673
Dr. Caroline Ho, DO
Duarte, CA · No drug or device payments recorded (2025) · Telehealth · (626) 256-4673
Dr. Deepa Nanayakkara
Duarte, CA · $125 in drug and device payments (2025) · Telehealth · (626) 256-4673
Dr. Jana Dickter, MD
Duarte, CA · No drug or device payments recorded (2025) · Telehealth · (626) 256-4673
Dr. Jeffrey Bender, MD
Duarte, CA · No drug or device payments recorded (2025) · (626) 218-8858
Dr. Randy Taplitz, MD
Duarte, CA · $4,675 in drug and device payments (2025) · (626) 256-4673
Dr. Sanjeet Dadwal, MD
Duarte, CA · $8,436 in drug and device payments (2025) · (626) 359-8111
Dr. Christina Hopson, DO
Dublin, CA · No drug or device payments recorded (2025) · (925) 237-9795
Dr. Mohammed Al-jasim, MD
El Centro, CA · $693 in drug and device payments (2025) · Telehealth · (760) 336-3773
Dr. Hannah Kern, M.D.
Encinitas, CA · $88 in drug and device payments (2025) · (760) 257-5750
Dr. Kevin Smith, M.D.
Encinitas, CA · $188 in drug and device payments (2025) · (760) 230-2252
Dr. Alan Nazarian, M.D.
Encino, CA · $261 in drug and device payments (2025) · (310) 914-9150
Dr. Ramee Younes, M.D.
Encino, CA · No drug or device payments recorded (2025) · Telehealth · (818) 461-8148
Dr. Russell Klein, MD
Encino, CA · $52 in drug and device payments (2025) · (818) 788-7500
Dr. Uzi Selcer, MD
Eureka, CA · No drug or device payments recorded (2025) · (707) 443-9371
Dr. Justin Graham, MD
Fairfield, CA · No drug or device payments recorded (2025) · (707) 646-4180
Dr. Mark Ellis, MD
Fairfield, CA · No drug or device payments recorded (2025) · (707) 426-3911
Dr. Elizabeth Kailath, MD,MPH
Fair Oaks, CA · $347 in drug and device payments (2025) · (916) 536-1136
Dr. Jeffrey Nelson, M.D.
Folsom, CA · No drug or device payments recorded (2025) · (916) 987-0765
Dr. Jea Lee, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-3910
Dr. Richard Morrissey, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-3910

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.

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.

Related reading on HealthcareDiscovery.AI

Infectious Disease in all 50 states Search all 1,121 in the directory Ask Zach for help choosing

Related

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. Are you a Infectious Disease in California? Get featured.