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.
Where Allergists (Internal Medicine) in California practice
From CMS Medicare enrollment records covering 46 of the 81 providers listed here (57%). Providers who do not bill Medicare are not included in these figures.
28%solo or small practice (under 10 clinicians)
15%mid-size group (10 to 99)
57%large group or health system (100+)
Largest practice groups
| Group (as registered with Medicare) | Allergists (Internal Medicine) | All clinicians in group | Main city |
| University of California San Francisco | 6 | 1,780 | San Francisco |
| UCSF Medical Group Business Services | 6 | 1,533 | San Francisco |
| Southern California Permanente Medical Group | 5 | 11,250 | Los Angeles |
| Stanford Health Care | 4 | 3,152 | Stanford |
| Regents of the University of California | 4 | 706 | San Francisco |
Hospitals where they hold privileges
| Hospital | City | Ownership | CMS star rating | Allergists (Internal Medicine) affiliated |
| UCSF Medical Center | San Francisco | Nonprofit | 4 of 5 | 6 |
| Stanford Health Care | Stanford | Nonprofit | 5 of 5 | 4 |
| UC San Diego Health Hillcrest - Hillcrest Med Ctr | San Diego | 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.
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. Clara Toro, M.D.Chula Vista, CA · No drug or device payments recorded (2025) ·
(619) 291-9285 Dr. Lawrence Awai, M.D.Clovis, CA · No drug or device payments recorded (2025) ·
(559) 323-1296 Dr. Imran Junaid, M.D.Concord, CA · $4,618 in drug and device payments (2025) · Telehealth ·
(925) 685-4224 Dr. Rosemary Hallett, M.D.Davis, CA · No drug or device payments recorded (2025) · Telehealth ·
(530) 752-2884 Dr. Suzanne Teuber, M.D.Davis, CA · No drug or device payments recorded (2025) ·
(530) 752-2884 Dr. Ray Williams, M.D.Inglewood, CA · $107 in drug and device payments (2025) ·
(310) 674-2876 Dr. Trisha Sharma, M.D.Irvine, CA · No drug or device payments recorded (2025) ·
(833) 574-2272 Dr. Kenneth Quinto, M.D.La Jolla, CA · No drug or device payments recorded (2025) ·
(619) 543-6248 Dr. Kevin Tse, M.D.La Jolla, CA · No drug or device payments recorded (2025) ·
(858) 657-8440 Dr. Christelle Miot, MDLoma Linda, CA · $524 in drug and device payments (2025) · Telehealth ·
(909) 558-2395 Dr. Sven Wang, MDLong Beach, CA · $2,311 in drug and device payments (2025) ·
(562) 997-7888 Dr. Tejal NarsaiLong Beach, CA · No drug or device payments recorded (2025) ·
(562) 826-5485 Dr. Frederick GuilfordLos Altos, CA · No drug or device payments recorded (2025) ·
(650) 964-6700 Dr. Andre Nel, MDLos Angeles, CA · No drug or device payments recorded (2025) ·
(310) 825-6301 Dr. Andrew Saxon, MDLos Angeles, CA · No drug or device payments recorded (2025) ·
(310) 794-9718 Dr. Edward Hu, M.D.Los Angeles, CA · No drug or device payments recorded (2025) ·
(323) 442-5100 Dr. Howard Strom, MDLos Angeles, CA · No drug or device payments recorded (2025) ·
(323) 851-6666 Dr. Joyce Lee, M.D.Los Angeles, CA · $115 in drug and device payments (2025) ·
(310) 825-7375 Dr. Robert Meth, MDLos Angeles, CA · No drug or device payments recorded (2025) ·
(310) 556-1377 Dr. Sheila Bonilla-tandoc, MD, MSLos Angeles, CA · $1,126 in drug and device payments (2025) · Telehealth ·
(323) 442-5100 Dr. William Klaustermeyer, MDLos Angeles, CA · No drug or device payments recorded (2025) ·
(310) 794-9718 Dr. Andrew Wong, M.D.Manhattan Beach, CA · $3,042 in drug and device payments (2025) · Telehealth ·
(310) 802-8016 Dr. Bruce Nelson, M.D.Mission Viejo, CA · No drug or device payments recorded (2025) ·
(949) 364-6000 Dr. Tyler Basen, M.D.Mission Viejo, CA · $2,751 in drug and device payments (2025) · Telehealth ·
(949) 755-6414 Dr. Gang Cheng, MDModesto, CA · $2,047 in drug and device payments (2025) · Telehealth ·
(209) 550-4792 Dr. Ravdeep Kaur, M.D.Napa, CA · No drug or device payments recorded (2025) ·
(203) 785-4170 Dr. Sam Ahn, M.D.Napa, CA · $4,313 in drug and device payments (2025) · Telehealth ·
(707) 258-8100 Dr. Cynthia Ramirez, RNOakland, CA · No drug or device payments recorded (2025) ·
(510) 437-4800 Dr. Linda Engelstad, MDOakland, CA · No drug or device payments recorded (2025) ·
(510) 437-4323 Dr. Monica TsaiOrange, CA · No drug or device payments recorded (2025) · Telehealth ·
(714) 456-8888 Dr. Rebecca Chinthrajah, M.D.Palo Alto, CA · $4,800 in drug and device payments (2025) · Telehealth ·
(650) 723-4000 Dr. Yu Wong, MDPalo Alto, CA · $68 in drug and device payments (2025) ·
(650) 497-8000 Dr. Jonathan Jalali, MDPasadena, CA · $573 in drug and device payments (2025) ·
(626) 304-0070 Dr. Amie Schweis, MDRedondo Beach, CA · $106 in drug and device payments (2025) ·
(310) 316-0811 Dr. Jesus Torpoco, MDReseda, CA · No drug or device payments recorded (2025) ·
(818) 881-3100 Dr. Brian Lipson, M.D.Rewood City, CA · $70 in drug and device payments (2025) ·
(650) 216-6111 Dr. Bruce Ryhal, MDRoseville, CA · No drug or device payments recorded (2025) ·
(530) 752-2884 Dr. Anna CherianSacramento, CA · $114 in drug and device payments (2025) ·
(916) 734-3665 Dr. Christine LicataSacramento, CA · $1,930 in drug and device payments (2025) · Telehealth ·
(925) 685-4224 Dr. Fatima Ali, MDSacramento, CA · No drug or device payments recorded (2025) ·
(916) 734-2737 Dr. Stephen Nagy, MDSacramento, CA · No drug or device payments recorded (2025) ·
(916) 456-4782 Dr. Osman Numair, MDSalinas, CA · $1,938 in drug and device payments (2025) ·
(831) 424-3300 Dr. Christopher Foster, MDSan Diego, CA · $338 in drug and device payments (2025) ·
(619) 524-1519 Dr. Nicholas Scanlon, M.D.San Diego, CA · $277 in drug and device payments (2025) · Telehealth ·
(800) 926-8273 Dr. Purvi Mehra, M.D.San Diego, CA · No drug or device payments recorded (2025) ·
(858) 278-3647 Dr. Xinyu Wang, MD, PHDSan Diego, CA · No drug or device payments recorded (2025) · Telehealth ·
(800) 926-8273 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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