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. Aron Swerdlin, M.D.
Oxnard, CA · $26 in drug and device payments (2025) · (805) 278-9094
Dr. Frank Chieu, M.D.
Oxnard, CA · No drug or device payments recorded (2025) · (805) 278-9094
Dr. Gregory Krastein, MD
Oxnard, CA · No drug or device payments recorded (2025) · Telehealth · (805) 822-4595
Dr. Harvey Lyons, M.D.
Oxnard, CA · No drug or device payments recorded (2025) · (805) 487-5588
Dr. Hashim Mapara, MD
Oxnard, CA · $179 in drug and device payments (2025) · Telehealth · (805) 983-8049
Dr. Koosha Mortazavi, M.D.
Oxnard, CA · $32 in drug and device payments (2025) · Telehealth · (805) 278-9094
Dr. Nicholas Bednarski, M.D.
Oxnard, CA · No drug or device payments recorded (2025) · (805) 278-9094
Dr. Rajendra Niraula, MD
Oxnard, CA · $32 in drug and device payments (2025) · Telehealth · (805) 278-9094
Dr. Steven Ledesma, M.D.
Oxnard, CA · $55 in drug and device payments (2025) · Telehealth · (805) 278-9094
Dr. Tane Liu, M.D.
Oxnard, CA · $55 in drug and device payments (2025) · Telehealth · (805) 278-9094
Dr. Norimoto Yanagawa, M.D.
Pacific Palisades, CA · No drug or device payments recorded (2025) · (310) 454-4832
Dr. John Fisher, M.D.
Palmdale, CA · $121 in drug and device payments (2025) · (661) 265-7019
Dr. Gary Stone, M.D.
Palm Desert, CA · No drug or device payments recorded (2025) · (760) 772-9626
Dr. Akber Saifullah, M.D.
Palm Springs, CA · No drug or device payments recorded (2025) · (760) 323-1155
Dr. Amr Youssef, DO
Palm Springs, CA · No drug or device payments recorded (2025) · (951) 687-3400
Dr. Anas Abou-ismail, MD
Palm Springs, CA · No drug or device payments recorded (2025) · (760) 323-1155
Dr. Carrie Minnelli, MD
Palm Springs, CA · $24 in drug and device payments (2025) · (951) 687-3400
Dr. Marcelo Koppel, M.D.
Palm Springs, CA · No drug or device payments recorded (2025) · (760) 327-1557
Dr. Andrew Koren, M.D.
Palo Alto, CA · No drug or device payments recorded (2025) · (650) 493-5000
Dr. Graham Rodwell, MD
Palo Alto, CA · $125 in drug and device payments (2025) · Telehealth · (650) 328-8385
Dr. Jane Tan, MD
Palo Alto, CA · $2,968 in drug and device payments (2025) · Telehealth · (650) 725-9891
Dr. Kaleb Thomas, MD
Palo Alto, CA · $114 in drug and device payments (2025) · (650) 321-4121
Dr. Luis Alvarez, MD
Palo Alto, CA · $370,261 in drug and device payments (2025) · Telehealth · (650) 328-8385
Dr. Marimar Contreras Nieves, MD
Palo Alto, CA · No drug or device payments recorded (2025) · Telehealth · (650) 853-2917
Dr. Michelle O'shaughnessy, MD
Palo Alto, CA · No drug or device payments recorded (2025) · (650) 725-4738
Dr. Nidharshan Anandasivam
Palo Alto, CA · $221 in drug and device payments (2025) · (650) 723-8561
Dr. Ralph Rabkin, MD, MBCHB
Palo Alto, CA · No drug or device payments recorded (2025) · (650) 858-3985
Dr. Robert Mair
Palo Alto, CA · No drug or device payments recorded (2025) · (650) 493-5000
Dr. Shota Obata, MD
Palo Alto, CA · No drug or device payments recorded (2025) · (650) 723-5948
Dr. Subramanian Sivarajan, M.D.
Palo Alto, CA · $997 in drug and device payments (2025) · Telehealth · (650) 328-8385
Dr. Timothy Meyer, MD
Palo Alto, CA · No drug or device payments recorded (2025) · (650) 852-3314
Dr. Toby Gottheiner, MD
Palo Alto, CA · No drug or device payments recorded (2025) · (650) 328-8385
Dr. Yiming Lit, M.D.
Palo Alto, CA · $100 in drug and device payments (2025) · (650) 493-5000
Dr. Annie Suh, MD
Panorama City, CA · No drug or device payments recorded (2025) · (818) 375-2000
Dr. Eduardo Lopez, M.D.
Panorama City, CA · $14 in drug and device payments (2025) · Telehealth · (818) 375-2574
Dr. Irma Harriman, M.D.
Panorama City, CA · No drug or device payments recorded (2025) · (818) 901-9906
Dr. Neda Poommipanit, M.D.
Panorama City, CA · No drug or device payments recorded (2025) · (310) 966-0540
Dr. Philip Tuso, MD
Panorama City, CA · $21 in drug and device payments (2025) · (818) 375-2000
Dr. Sheila Raj, MD
Panorama City, CA · No drug or device payments recorded (2025) · (818) 375-2000
Dr. George Hon, MD
Paramount, CA · $1,190 in drug and device payments (2025) · Telehealth · (562) 297-4120
Dr. Mohammad Ismail, MD
Paramount, CA · $267 in drug and device payments (2025) · Telehealth · (562) 602-2334
Dr. Richard Lee, MD
Paramount, CA · $19 in drug and device payments (2025) · (562) 531-0015
Dr. Allen Chao
Pasadena, CA · $122 in drug and device payments (2025) · Telehealth · (626) 577-1675
Dr. Ann Moore, MD
Pasadena, CA · $448 in drug and device payments (2025) · Telehealth · (626) 577-1675
Dr. Ashok Sunder Raj, M.D.
Pasadena, CA · $51 in drug and device payments (2025) · (626) 794-7075
Dr. Freddy Calderon, M.D.
Pasadena, CA · No drug or device payments recorded (2025) · (626) 405-7914
Dr. Ilian Marquez, M.D.
Pasadena, CA · $1,110 in drug and device payments (2025) · (626) 794-7075
Dr. Justin Chen, MD
Pasadena, CA · No drug or device payments recorded (2025) · Telehealth · (626) 352-0010
Dr. Ka-lok Tse, M.D.
Pasadena, CA · $1,512 in drug and device payments (2025) · Telehealth · (626) 577-1675
Dr. Matthew Kim, DO
Pasadena, CA · $974 in drug and device payments (2025) · Telehealth · (626) 577-1675

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.