HealthcareDiscovery.AI / Doctors / California / Nephrology

Nephrologists in California

Data updated monthly · Last refresh October 2026

1,476 Nephrology providers practice in California, including 665 (45%) 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.

1,476providers
665telehealth
Los Angelestop city

Nephrology by city in California

Choose a city to see providers there.

Nephrology in Los Angeles153 providers
Nephrology in San Diego75 providers
Nephrology in San Francisco71 providers
Nephrology in Sacramento59 providers
Nephrology in Stanford39 providers
Nephrology in Fresno37 providers
Nephrology in Torrance36 providers
Nephrology in Orange33 providers
Nephrology in San Jose32 providers
Nephrology in Berkeley24 providers
Nephrology in Loma Linda23 providers
Nephrology in Fountain Valley20 providers
Nephrology in Riverside18 providers
Nephrology in Long Beach17 providers
Nephrology in Bakersfield17 providers
Nephrology in Stockton16 providers
Nephrology in Modesto16 providers
Nephrology in La Jolla15 providers
Nephrology in Palo Alto15 providers
Nephrology in Montebello14 providers
Nephrology in Oakland13 providers
Nephrology in Roseville13 providers
Nephrology in Beverly Hills13 providers
Nephrology in Pasadena13 providers

Nephrology 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. John Lilley, M.D.
Escondido, CA · No drug or device payments recorded (2025) · (760) 745-1551
Dr. Joseph Hebreo, M.D.
Escondido, CA · $270 in drug and device payments (2025) · Telehealth · (760) 294-1660
Dr. Joshua Greenstein, M.D.
Escondido, CA · No drug or device payments recorded (2025) · Telehealth · (760) 294-1660
Dr. Mark Shapiro, M.D.
Escondido, CA · $328 in drug and device payments (2025) · (760) 294-1660
Dr. Mohammed Neyaz, D.O.
Escondido, CA · $2 in drug and device payments (2025) · Telehealth · (760) 294-1660
Dr. Qasim Choudry, MD
Escondido, CA · $137 in drug and device payments (2025) · Telehealth · (760) 294-1660
Dr. Zaid Al-dahhan, M.D.
Escondido, CA · $134 in drug and device payments (2025) · Telehealth · (760) 294-1660
Dr. Allen Mathew, MD
Eureka, CA · $606 in drug and device payments (2025) · Telehealth · (707) 444-2534
Dr. Jack Luo, MD
Fairfield, CA · $364 in drug and device payments (2025) · (707) 426-5407
Dr. Madison Calder, MD
Fairfield, CA · No drug or device payments recorded (2025) · (707) 816-5930
Dr. Oleg Rubin, MD
Fairfield, CA · $371 in drug and device payments (2025) · (707) 426-5407
Dr. Steven Ong, MD
Fairfield, CA · $474 in drug and device payments (2025) · (707) 426-5407
Dr. Steven Tolkan, MD
Fairfield, CA · $476 in drug and device payments (2025) · (707) 423-2506
Dr. Maria Joana Thomas, MD
Folsom, CA · No drug or device payments recorded (2025) · Telehealth · (916) 235-7790
Dr. Vijay Mudunuri, MD
Folsom, CA · No drug or device payments recorded (2025) · Telehealth · (916) 235-7790
Dr. Andy Chuu, MD
Fontana, CA · No drug or device payments recorded (2025) · (888) 750-0036
Dr. An Nguyen, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-3910
Dr. Charles Lu, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-3910
Dr. George Grames, M.D.
Fontana, CA · No drug or device payments recorded (2025) · (909) 356-9664
Dr. Jan Herrman, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-3910
Dr. Jason Mak, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-3910
Dr. Jennet Lee, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-3910
Dr. Paula Cho, MD
Fontana, CA · No drug or device payments recorded (2025) · (909) 427-3910
Dr. Talha Imam, MD
Fontana, CA · $750 in drug and device payments (2025) · (909) 427-3910
Dr. Woldemariam Gebreselassie, MD
Fontana, CA · $150 in drug and device payments (2025) · (909) 427-3910
Dr. Afsaneh Haftbaradaran Mohammadi, M.D.
Fountain Valley, CA · $153 in drug and device payments (2025) · Telehealth · (714) 241-9200
Dr. Ajit Sawhney, M.D.
Fountain Valley, CA · $134 in drug and device payments (2025) · Telehealth · (714) 641-9696
Dr. Alan Cantillep, MD
Fountain Valley, CA · $34 in drug and device payments (2025) · Telehealth · (714) 641-9696
Dr. Essam Mostafa, M.D.
Fountain Valley, CA · $57 in drug and device payments (2025) · (714) 486-2586
Dr. Gaytri Manek, MD
Fountain Valley, CA · $146 in drug and device payments (2025) · Telehealth · (714) 435-0150
Dr. Joginder Jodhka, MD
Fountain Valley, CA · $142 in drug and device payments (2025) · Telehealth · (714) 241-9200
Dr. John Ong, DO
Fountain Valley, CA · $1,393 in drug and device payments (2025) · Telehealth · (714) 641-9696
Dr. Lalitha Durairaj, MD
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 641-9696
Dr. Nasim Shahbazi, MD
Fountain Valley, CA · $34 in drug and device payments (2025) · Telehealth · (714) 641-9696
Dr. Nhat Vo, MD
Fountain Valley, CA · $608 in drug and device payments (2025) · (714) 435-0150
Dr. Philip Yang, MD
Fountain Valley, CA · $528 in drug and device payments (2025) · (714) 486-2586
Dr. Rallabhandi Sankaram, M.D.
Fountain Valley, CA · $150 in drug and device payments (2025) · (714) 641-9696
Dr. Sajeet Sawhney, M.D.
Fountain Valley, CA · $179 in drug and device payments (2025) · Telehealth · (714) 641-9696
Dr. Sandeep Dang, M.D.
Fountain Valley, CA · $77 in drug and device payments (2025) · Telehealth · (714) 641-9696
Dr. Sithu Lin, M.D.
Fountain Valley, CA · $258 in drug and device payments (2025) · (714) 641-9696
Dr. Son Dinh, M.D.
Fountain Valley, CA · $321 in drug and device payments (2025) · (714) 486-2586
Dr. Tarun Marwaha, M.D.
Fountain Valley, CA · $438 in drug and device payments (2025) · Telehealth · (714) 241-9200
Dr. Thanh Cao, D.O.
Fountain Valley, CA · $766 in drug and device payments (2025) · Telehealth · (714) 641-9696
Dr. Vijayalakshmi Wijeyakumar, M.D.
Fountain Valley, CA · No drug or device payments recorded (2025) · (714) 641-9696
Dr. Zavier Ahmed, M.D.
Fountain Valley, CA · $439 in drug and device payments (2025) · Telehealth · (714) 241-9200
Dr. Ronald Albright, M.D.
Freedom, CA · No drug or device payments recorded (2025) · (831) 722-8125
Dr. Cynthia Tsui, MD
Fremont, CA · No drug or device payments recorded (2025) · (510) 925-2126
Dr. Jeanie Ahn, M.D.
Fremont, CA · $2,191 in drug and device payments (2025) · Telehealth · (510) 745-8186
Dr. Lucia Yumena, M.D.
Fremont, CA · No drug or device payments recorded (2025) · (510) 745-8100
Dr. Mary Palathumpat, MD
Fremont, CA · No drug or device payments recorded (2025) · (510) 795-3000

Conditions Nephrology providers in California commonly treat

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

Common questions

How many Nephrology providers are in California?

There are 1,476 Nephrology providers with active NPI records practicing in California, according to federal NPPES data refreshed monthly.

Do Nephrology providers in California offer telehealth?

Yes. 665 of the 1,476 Nephrology providers in California (about 45%) report offering telehealth services in CMS data.

Which cities in California have the most Nephrology providers?

Los Angeles (153), San Diego (75), San Francisco (71) have the highest concentration of Nephrology providers in California.

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

885 of 1,476 Nephrology providers in California (60%) received at least one payment from a drug or device company in 2025, according to the federal Open Payments program.

What conditions do Nephrology providers in California treat?

Nephrology providers commonly treat chronic kidney disease, kidney stones, dialysis care, high blood pressure 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 Nephrologists in California work in independent practices or large health systems?

Among 1,107 Nephrologists in California enrolled in Medicare, 30% bill through a solo or small practice with fewer than 10 clinicians, 21% through a mid-size group of 10 to 99, and 49% through a large group or health system with 100 or more clinicians, according to CMS enrollment records.

Which hospitals do Nephrologists in California work at?

According to CMS facility affiliation records, the California hospitals where the most Nephrologists hold privileges are Uci Health-Orange in Orange; Cedars-Sinai Medical Center in Los Angeles; Stanford Health Care in Stanford.

Nephrology in all 50 states Search all 1,476 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 Nephrology in California? Get featured.