Allergists (Internal Medicine) in California
Data updated monthly · Last refresh October 2026
81 Allergy & Immunology (Internal Medicine) providers practice in California, including 30 (37%) offering telehealth. The largest concentration is in San Francisco. 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.
81providers
30telehealth
San Franciscotop city
Allergy & Immunology (Internal Medicine) by city in California
Choose a city to see providers there.
Allergy & Immunology (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. Anna LangSan Francisco, CA · $31 in drug and device payments (2025) · Telehealth ·
(415) 353-2961 Dr. Iris Otani, M.D.San Francisco, CA · $8,550 in drug and device payments (2025) · Telehealth ·
(415) 353-2961 Dr. Kavitha ThiagarajanSan Francisco, CA · $666 in drug and device payments (2025) · Telehealth ·
(415) 476-3266 Dr. Lulu TsaoSan Francisco, CA · $68 in drug and device payments (2025) · Telehealth ·
(415) 353-2725 Dr. Lynn Spitler, MDSan Francisco, CA · No drug or device payments recorded (2025) ·
(415) 750-5660 Dr. Michael Main, MDSan Francisco, CA · $674 in drug and device payments (2025) · Telehealth ·
(702) 882-5285 Dr. Michele Pham, M.D.San Francisco, CA · No drug or device payments recorded (2025) · Telehealth ·
(415) 353-2725 Dr. Roger Wang, D.O.San Francisco, CA · $2,032 in drug and device payments (2025) · Telehealth ·
(415) 677-0901 Dr. Rose MonahanSan Francisco, CA · No drug or device payments recorded (2025) · Telehealth ·
(415) 353-2725 Dr. Sowmya Arja, M.D.San Francisco, CA · No drug or device payments recorded (2025) ·
(415) 362-2614 Dr. Von Nguyen, MDSan Francisco, CA · No drug or device payments recorded (2025) ·
(415) 600-6000 Dr. Warner Greene, M.D., PH.D.San Francisco, CA · No drug or device payments recorded (2025) ·
(415) 734-4805 Dr. Clayton Feldman, M.D.San Jose, CA · No drug or device payments recorded (2025) ·
(408) 278-3003 Dr. Andrew Engler, MDSan Mateo, CA · $72 in drug and device payments (2025) · Telehealth ·
(650) 343-4597 Dr. Nisha Patel, MDSan Mateo, CA · $275 in drug and device payments (2025) ·
(650) 348-1242 Dr. Zahida Maskatia, M.D.San Mateo, CA · $48 in drug and device payments (2025) ·
(650) 376-0853 Dr. Sally Bailey, MDSan Ramon, CA · $95,315 in drug and device payments (2025) ·
(925) 327-1450 Dr. Jeremy Kaslow, M.D.Santa Ana, CA · $21 in drug and device payments (2025) ·
(714) 565-1032 Dr. Liza Presser Belkin, M.D.Santa Barbara, CA · $1,666 in drug and device payments (2025) · Telehealth ·
(805) 569-3377 Dr. Richard Wu, M.D.South San Francisco, CA · No drug or device payments recorded (2025) ·
(415) 343-5551 Dr. Anna Arroyo, MDStanford, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-4000 Dr. Linda Zhu, MDStanford, CA · No drug or device payments recorded (2025) · Telehealth ·
(650) 723-4000 Dr. Meng Chen, MDStanford, CA · $264 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Carlos Meza, M.D.Stockton, CA · No drug or device payments recorded (2025) ·
(209) 944-9063 Dr. Shields Abernathy, M.D.Templeton, CA · No drug or device payments recorded (2025) ·
(805) 434-1000 Dr. Chongwei CuiThousand Oaks, CA · No drug or device payments recorded (2025) ·
(805) 418-3500 Dr. Raffi TchekmedyianTorrance, CA · $3,018 in drug and device payments (2025) · Telehealth ·
(310) 833-1334 Dr. Geoffrey Carlson, MDTravis Afb, CA · $9,808 in drug and device payments (2025) · Telehealth ·
(707) 423-5107 Dr. Amit Patel, MDUpland, CA · $39,591 in drug and device payments (2025) ·
(909) 931-4034 Dr. Jay Keystone, M.D.Vacaville, CA · No drug or device payments recorded (2025) · Telehealth ·
(707) 446-8581 Dr. Suzanne Cassel, MDWest Hollywood, CA · No drug or device payments recorded (2025) · Telehealth ·
(310) 423-8784 Common questions
How many Allergy & Immunology (Internal Medicine) providers are in California?There are 81 Allergy & Immunology (Internal Medicine) providers with active NPI records practicing in California, according to federal NPPES data refreshed monthly.
Do Allergy & Immunology (Internal Medicine) providers in California offer telehealth?Yes. 30 of the 81 Allergy & Immunology (Internal Medicine) providers in California (about 37%) report offering telehealth services in CMS data.
Which cities in California have the most Allergy & Immunology (Internal Medicine) providers?San Francisco (12), Los Angeles (8), San Diego (4) have the highest concentration of Allergy & Immunology (Internal Medicine) providers in California.
How many Allergy & Immunology (Internal Medicine) providers in California received drug or device company payments?40 of 81 Allergy & Immunology (Internal Medicine) providers in California (49%) 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 Allergists (Internal Medicine) in California work in independent practices or large health systems?Among 46 Allergists (Internal Medicine) in California enrolled in Medicare, 28% bill through a solo or small practice with fewer than 10 clinicians, 15% through a mid-size group of 10 to 99, and 57% through a large group or health system with 100 or more clinicians, according to CMS enrollment records.
Which hospitals do Allergists (Internal Medicine) in California work at?According to CMS facility affiliation records, the California hospitals where the most Allergists (Internal Medicine) hold privileges are UCSF Medical Center in San Francisco; Stanford Health Care in Stanford; UC San Diego Health Hillcrest - Hillcrest Med Ctr in San Diego.
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