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Internal Medicine Doctors in California

Data updated monthly · Last refresh October 2026

17,715 Internal Medicine providers practice in California, including 4,245 (24%) 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.

17,715providers
4,245telehealth
Los Angelestop city

Internal Medicine by city in California

Choose a city to see providers there.

Internal Medicine in Los Angeles1,417 providers
Internal Medicine in San Francisco1,322 providers
Internal Medicine in San Diego970 providers
Internal Medicine in Sacramento602 providers
Internal Medicine in Oakland434 providers
Internal Medicine in San Jose433 providers
Internal Medicine in Stanford383 providers
Internal Medicine in Fresno339 providers
Internal Medicine in Torrance230 providers
Internal Medicine in Long Beach225 providers
Internal Medicine in Bakersfield210 providers
Internal Medicine in Loma Linda209 providers
Internal Medicine in Palo Alto189 providers
Internal Medicine in Anaheim188 providers
Internal Medicine in Orange188 providers
Internal Medicine in Riverside188 providers
Internal Medicine in Walnut Creek184 providers
Internal Medicine in Santa Monica170 providers
Internal Medicine in La Jolla161 providers
Internal Medicine in Roseville159 providers
Internal Medicine in Irvine155 providers
Internal Medicine in Beverly Hills152 providers
Internal Medicine in Santa Clara142 providers
Internal Medicine in Pasadena138 providers

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. Kumara Prathipati, M.D.
National City, CA · $19 in drug and device payments (2025) · (619) 267-0552
Dr. Miguel Martinez, M.D.
National City, CA · No drug or device payments recorded (2025) · (619) 477-0084
Dr. Nirali Patel, M.D.
National City, CA · $27 in drug and device payments (2025) · (619) 472-4690
Dr. Razi Hekmat, M.D.
National City, CA · $79 in drug and device payments (2025) · (619) 472-2665
Dr. Renato Masilungan, MD
National City, CA · No drug or device payments recorded (2025) · (619) 474-8989
Dr. Valerie Altavas, M.D.
National City, CA · $319 in drug and device payments (2025) · Telehealth · (619) 472-4575
Dr. Jason Krupp, MD
Newark, CA · No drug or device payments recorded (2025) · (510) 248-1860
Dr. Meera Bhateja, M.D.
Newark, CA · No drug or device payments recorded (2025) · (510) 505-1600
Dr. Michael Parmley, M.D.
Newark, CA · No drug or device payments recorded (2025) · (510) 248-1860
Dr. Omar Mapara, M.D.
Newark, CA · No drug or device payments recorded (2025) · (310) 895-4340
Dr. Parmjit Singh, MD
Newark, CA · No drug or device payments recorded (2025) · (510) 656-5700
Dr. Shaista Shah, MD
Newark, CA · $33 in drug and device payments (2025) · Telehealth · (510) 791-1798
Dr. Stefanie Chu, MD
Newark, CA · No drug or device payments recorded (2025) · (510) 505-1600
Dr. Aram Mkhitarian, D.O.
Newbury Park, CA · $198 in drug and device payments (2025) · Telehealth · (805) 410-4566
Dr. Asra Siddiqui, M.D.
Newbury Park, CA · No drug or device payments recorded (2025) · Telehealth · (805) 375-6000
Dr. Benjamin Capper, M.D.
Newbury Park, CA · $168 in drug and device payments (2025) · Telehealth · (747) 222-6501
Dr. Dan Li, M.D.
Newbury Park, CA · No drug or device payments recorded (2025) · (805) 490-8390
Dr. Garry Forkosh, M.D.
Newbury Park, CA · $340 in drug and device payments (2025) · (646) 734-2585
Dr. Gloria Lee, MD
Newbury Park, CA · $2,376 in drug and device payments (2025) · Telehealth · (805) 214-3122
Dr. Philip Barr, M.D.
Newbury Park, CA · No drug or device payments recorded (2025) · (805) 499-0308
Dr. Ricardo Dent-acosta, M.D.
Newbury Park, CA · No drug or device payments recorded (2025) · (805) 905-5863
Dr. Steven Koe, M.D.
Newbury Park, CA · $24 in drug and device payments (2025) · (805) 375-1611
Dr. Treise Tomlinson-chesnut, M.D.
Newbury Park, CA · $2,496 in drug and device payments (2025) · Telehealth · (805) 214-3122
Dr. Abeer Awad, MD
Newport Beach, CA · No drug or device payments recorded (2025) · (949) 791-3001
Dr. Aditi Springstubb, M.D.
Newport Beach, CA · $119 in drug and device payments (2025) · Telehealth · (949) 791-3001
Dr. Alison Sims, M.D.
Newport Beach, CA · No drug or device payments recorded (2025) · (949) 760-9222
Dr. Allyson Hoppe, M.D.
Newport Beach, CA · $104 in drug and device payments (2025) · (949) 310-7245
Dr. Andre Vovan, MD
Newport Beach, CA · $164 in drug and device payments (2025) · (949) 764-6876
Dr. Ani Baghdassarian
Newport Beach, CA · No drug or device payments recorded (2025) · Telehealth · (949) 791-3001
Dr. Anita Bajpai, MD
Newport Beach, CA · $25 in drug and device payments (2025) · (949) 574-1091
Dr. Anna Ottaka, M.D.
Newport Beach, CA · No drug or device payments recorded (2025) · (949) 720-4920
Dr. Annasha Gabriel, MD
Newport Beach, CA · No drug or device payments recorded (2025) · Telehealth · (949) 445-8768
Dr. Bradley Kays, M.D.
Newport Beach, CA · $46 in drug and device payments (2025) · Telehealth · (949) 644-3566
Dr. Brenton Davis, MD
Newport Beach, CA · No drug or device payments recorded (2025) · (803) 212-8740
Dr. Brian Cheung, MD
Newport Beach, CA · No drug or device payments recorded (2025) · Telehealth · (949) 386-5700
Dr. Cameron Khavarian, M.D.
Newport Beach, CA · No drug or device payments recorded (2025) · (949) 645-8475
Dr. Carolyn Ward
Newport Beach, CA · No drug or device payments recorded (2025) · (833) 334-6393
Dr. Catherine Koper, MD
Newport Beach, CA · $201 in drug and device payments (2025) · Telehealth · (949) 515-3590
Dr. Cesar Guerrero, M.D.
Newport Beach, CA · No drug or device payments recorded (2025) · (949) 270-6371
Dr. Christopher Coulter, MD
Newport Beach, CA · No drug or device payments recorded (2025) · (714) 296-3333
Dr. Claire Scott, MD
Newport Beach, CA · No drug or device payments recorded (2025) · (877) 742-4624
Dr. Daniel Choi, M.D
Newport Beach, CA · No drug or device payments recorded (2025) · Telehealth · (949) 574-4694
Dr. Dattatreya Ramisetti, MD
Newport Beach, CA · No drug or device payments recorded (2025) · (949) 548-8833
Dr. David Brouwer, MD
Newport Beach, CA · $90 in drug and device payments (2025) · Telehealth · (949) 574-0777
Dr. David Chirikian, MD
Newport Beach, CA · No drug or device payments recorded (2025) · (949) 791-3001
Dr. David Chun, MD
Newport Beach, CA · $690 in drug and device payments (2025) · Telehealth · (949) 574-0777
Dr. Dennis Jordanides, M.D.
Newport Beach, CA · $261 in drug and device payments (2025) · (949) 734-7446
Dr. Diana Zhao, MD
Newport Beach, CA · $752 in drug and device payments (2025) · (949) 764-8065
Dr. Dorothy Marquez-maneja, MD
Newport Beach, CA · $48 in drug and device payments (2025) · Telehealth · (800) 400-4624
Dr. Douglas Mcconnaughey, MD
Newport Beach, CA · $38 in drug and device payments (2025) · (949) 706-0181

Conditions Internal Medicine providers in California commonly treat

Patients often search by condition rather than specialty. These are conditions typically managed by Internal Medicine providers. Individual practices vary, so confirm with the provider before booking.

Common questions

How many Internal Medicine providers are in California?

There are 17,715 Internal Medicine providers with active NPI records practicing in California, according to federal NPPES data refreshed monthly.

Do Internal Medicine providers in California offer telehealth?

Yes. 4,245 of the 17,715 Internal Medicine providers in California (about 24%) report offering telehealth services in CMS data.

Which cities in California have the most Internal Medicine providers?

Los Angeles (1,417), San Francisco (1,322), San Diego (970) have the highest concentration of Internal Medicine providers in California.

How many Internal Medicine providers in California received drug or device company payments?

5,614 of 17,715 Internal Medicine providers in California (32%) received at least one payment from a drug or device company in 2025, according to the federal Open Payments program.

What conditions do Internal Medicine providers in California treat?

Internal Medicine providers commonly treat high blood pressure, type 2 diabetes, high cholesterol, preventive care, chronic disease management 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 Internal Medicine Doctors in California work in independent practices or large health systems?

Among 10,847 Internal Medicine Doctors in California enrolled in Medicare, 20% bill through a solo or small practice with fewer than 10 clinicians, 12% through a mid-size group of 10 to 99, and 67% through a large group or health system with 100 or more clinicians, according to CMS enrollment records.

Which hospitals do Internal Medicine Doctors in California work at?

According to CMS facility affiliation records, the California hospitals where the most Internal Medicine Doctors 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

Internal Medicine in all 50 states Search all 17,715 in the directory Ask Zach for help choosing

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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 Internal Medicine in California? Get featured.