HealthcareDiscovery.AI / Doctors / California / Los Altos / Internal Medicine

Internal Medicine in Los Altos, California

Data updated monthly · Last refresh September 2026

29 Internal Medicine providers practice in Los Altos, and 21% received drug or device company payments in 2025. Listings are drawn from federal public records and are not endorsements.

Internal Medicine providers in Los Altos

Listed alphabetically. 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. Allan Kramer, M.D.
Los Altos, CA · No drug or device payments recorded (2025) · (650) 224-4970
Dr. Amy Muzaffar, MD
Los Altos, CA · No drug or device payments recorded (2025) · (650) 254-5200
Dr. Bhanu-rekha Bhaskar, MD
Los Altos, CA · No drug or device payments recorded (2025) · Telehealth · (650) 254-5200
Dr. Carrie Mousseau, M.D.
Los Altos, CA · No drug or device payments recorded (2025) · (650) 888-5790
Dr. Charles Tuchinda, M.D.
Los Altos, CA · No drug or device payments recorded (2025) · (617) 930-6428
Dr. Dianne Storey, MD
Los Altos, CA · No drug or device payments recorded (2025) · Telehealth · (650) 254-5200
Dr. Francis Lastufka, MD
Los Altos, CA · No drug or device payments recorded (2025) · Telehealth · (650) 254-5200
Dr. Gina Serraiocco, MD
Los Altos, CA · No drug or device payments recorded (2025) · Telehealth · (650) 254-5200
Dr. Heba Yassin Jioussy, MD
Los Altos, CA · No drug or device payments recorded (2025) · Telehealth · (650) 254-5200
Dr. Jacqueline Denkabe, MD
Los Altos, CA · No drug or device payments recorded (2025) · Telehealth · (650) 254-5200
Dr. Janusz Madej, M.D.
Los Altos, CA · $718 in drug and device payments (2025) · (650) 529-1669
Dr. Jessica Favreau, MD
Los Altos, CA · No drug or device payments recorded (2025) · (650) 668-2558
Dr. Jessica Madej, MD
Los Altos, CA · $876 in drug and device payments (2025) · (650) 529-1669
Dr. Julia Fong, MD
Los Altos, CA · No drug or device payments recorded (2025) · Telehealth · (650) 254-5200
Dr. Karen Suskiewicz, MD
Los Altos, CA · No drug or device payments recorded (2025) · Telehealth · (650) 254-5200
Dr. Karthikeyan Viswanathan, DO
Los Altos, CA · $29 in drug and device payments (2025) · (866) 362-4246
Dr. Lailey Naomi Oliva, MD
Los Altos, CA · No drug or device payments recorded (2025) · Telehealth · (650) 254-5200
Dr. Laurel Trujillo, MD
Los Altos, CA · No drug or device payments recorded (2025) · (650) 254-5200
Dr. Patricia Sitnitsky, M.D.
Los Altos, CA · $2,243 in drug and device payments (2025) · Telehealth · (408) 495-5770
Dr. Paul Tang, M.D.
Los Altos, CA · No drug or device payments recorded (2025) · (650) 254-5200
Dr. Payvand Milani
Los Altos, CA · No drug or device payments recorded (2025) · Telehealth · (650) 254-5200
Dr. Ronda Macchello, MD
Los Altos, CA · No drug or device payments recorded (2025) · (650) 254-5200
Dr. Ronesh Sinha, MD
Los Altos, CA · $66 in drug and device payments (2025) · Telehealth · (650) 254-5200
Dr. Simon Humphries, MD
Los Altos, CA · $93 in drug and device payments (2025) · Telehealth · (650) 917-6920
Dr. Steven Hamman, M.D.
Los Altos, CA · No drug or device payments recorded (2025) · (650) 903-0843
Dr. Steven Natterstad, M.D.
Los Altos, CA · No drug or device payments recorded (2025) · (650) 917-1357
Dr. Susan Sorensen, MD
Los Altos, CA · No drug or device payments recorded (2025) · (650) 941-5028
Dr. Tinuola Ademola, MD
Los Altos, CA · No drug or device payments recorded (2025) · Telehealth · (650) 254-5200
Dr. Valerie Gurle, M.D.
Los Altos, CA · No drug or device payments recorded (2025) · (650) 949-1914

Conditions Internal Medicine providers in Los Altos, 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 Los Altos, California?

There are 29 Internal Medicine providers with active NPI records practicing in Los Altos, according to federal NPPES data refreshed monthly.

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

6 of 29 (21%) 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 Los Altos treat?

Internal Medicine providers in Los Altos 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 records 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.

All specialties in Los Altos Internal Medicine across California

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.