Physician specialty
Nephrology (Kidney)
At a glance
- Practicing in the U.S.
- 13,252
- Per 100,000 residents
- 3.9
- Women
- 30%
- Median years since graduating
- 25
Training path
- College (bachelor’s degree) 4 years
- Medical school (MD or DO) 4 years
- Internal medicine residency 3 years
- Nephrology fellowship 2 years
Training after medical school: 5 years. From the start of college: about 13 years.
Usual minimum program lengths from ACGME program requirements. Some doctors take extra research years or a second fellowship.
Who they are
- MD (DOs make up the rest) 93%
- Women 30%
- Graduated 35 or more years ago 23%
- Offer telehealth 47%
- Accept Medicare’s approved amount 97%
Sex and credentials from NPPES. Graduation year, telehealth and Medicare assignment from Medicare Care Compare, which covers clinicians enrolled in Medicare.
Where they practice
What they do most for Medicare patients
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 2,848,746
- Established patient office or other outpatient visit, 30-39 minutes 1,946,590
- Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 1,674,089
- Dialysis services, 4 or more physician visits per month (20 years or older) 1,101,411
- Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 554,462
- Hemodialysis procedure with physician evaluation 460,090
- Established patient office or other outpatient visit, 20-29 minutes 440,314
- Dialysis services, 2-3 physician visits per month (20 years or older) 346,380
- Established patient office or other outpatient visit, 40-54 minutes 337,047
- Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 311,245
- Insertion of needle into vein for collection of blood sample 302,265
- Dialysis services, per day, less than full month service (20 years or older) 252,170
Services billed to traditional Medicare in 2023 (Physician and Other Practitioners data); drugs given in the office are left out.
What they prescribe most
- Amlodipine Besylate (Norliqva, Norvasc) 6.9%
- Losartan Potassium (Cozaar) 5.9%
- Furosemide (Furoscix, Lasix) 5.5%
- Calcitriol (Rocaltrol, Vectical) 4.2%
- Dapagliflozin Propanediol (Farxiga, Dapagliflozin) 3.6%
- Lisinopril (Qbrelis, Zestril) 3.5%
- Carvedilol (Coreg) 3.5%
- Allopurinol 3.2%
- Atorvastatin Calcium (Atorvaliq, Lipitor) 2.8%
- Hydralazine Hcl 2.8%
- Sevelamer Carbonate (Renvela) 2.5%
- Empagliflozin (Jardiance) 2.3%
- Nifedipine (Procardia Xl) 2.2%
- Potassium Chloride (Klor-Con, Klor-Con M15, Klor-Con 10) 1.8%
- Tamsulosin Hcl (Flomax) 1.8%
Share of this specialty’s Medicare Part D prescriptions in 2024, including refills. Select a drug to see which of these clinicians prescribe it most, and where.
Hospitals where the most work
- Northwestern Medicine Central Dupage Hospital Winfield, IL 126 Nephrology (Kidney) at Northwestern Medicine Central Dupage Hospital
- Memorial Hermann Hospital System Houston, TX 85 Nephrology (Kidney) at Memorial Hermann Hospital System
- Brigham and Women's Hospital Boston, MA 85 Nephrology (Kidney) at Brigham and Women's Hospital
- New York-Presbyterian Hospital New York, NY 83 Nephrology (Kidney) at New York-Presbyterian Hospital
- Hospital of Univ of Pennsylvania Philadelphia, PA 79 Nephrology (Kidney) at Hospital of Univ of Pennsylvania
- Adventhealth Orlando Orlando, FL 79 Nephrology (Kidney) at Adventhealth Orlando
- Methodist Hospital San Antonio, TX 75 Nephrology (Kidney) at Methodist Hospital
- Uci Health-Orange Orange, CA 73 Nephrology (Kidney) at Uci Health-Orange
- NYU Langone Hospitals New York, NY 71 Nephrology (Kidney) at NYU Langone Hospitals
- Houston Methodist Hospital Houston, TX 70 Nephrology (Kidney) at Houston Methodist Hospital
Clinicians who list the hospital in Medicare Care Compare. The number opens the list of who works there.
Schools they graduated from most
- Albert Einstein College of Medicine of Yeshiva University 82
- Philadelphia College of Osteopathic Medicine 79
- Ohio State University College of Medicine 65
- University of Puerto Rico School of Medicine 63
- University of Texas Southwestern Medical School at Dallas 60
- New York College of Osteo Medicine of New York Institute of Technology 59
- University of Illinois College of Med (chi/peor/rock/chm-Urb) 58
- Wayne State University School of Medicine 57
- New York University School of Medicine 55
- New York Medical College 54
From Medicare Care Compare (Medicare-enrolled clinicians only).
Industry payments
Drug and device makers reported $25.8M in general payments to 8,134 clinicians in Nephrology (Kidney) in 2025. See who received the most
Source: CMS Open Payments, program year 2025. A payment is not evidence of wrongdoing.
Research in this field
U.S. researchers published 11,652 articles and reviews in nephrology in 2024–2026.
Journals with the most U.S. papers
- Journal of the American Society of Nephrology American Society of Nephrology 2,537
- Kidney International Reports Elsevier BV 543
- Cureus Cureus, Inc. 301
- Nephrology Dialysis Transplantation Oxford University Press 282
- Clinical Journal of the American Society of Nephrology Lippincott Williams & Wilkins 275
- Kidney360 Lippincott Williams & Wilkins 269
- Kidney International Elsevier BV 238
- Kidney Medicine Elsevier BV 192
- American Journal of Kidney Diseases Elsevier BV 148
- Physiology American Physiological Society 134
Most-cited recent papers
- Effects of Semaglutide on Chronic Kidney Disease in Patients with Type 2 Diabetes (opens in a new tab) New England Journal of Medicine, 2024 · cited 2,100 times
- Chronic kidney disease and the global public health agenda: an international consensus (opens in a new tab) Nature Reviews Nephrology, 2024 · cited 1,627 times · free to read
- Global, regional, and national burden of chronic kidney disease in adults, 1990–2023, and its attributable risk factors: a systematic analysis for the Global Burden of Disease Study 2023 (opens in a new tab) The Lancet, 2025 · cited 625 times · free to read
- An update on the global disparities in kidney disease burden and care across world countries and regions (opens in a new tab) The Lancet Global Health, 2024 · cited 591 times · free to read
- Executive summary of the KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease: known knowns and known unknowns (opens in a new tab) Kidney International, 2024 · cited 477 times · free to read
- Finerenone with Empagliflozin in Chronic Kidney Disease and Type 2 Diabetes (opens in a new tab) New England Journal of Medicine, 2025 · cited 348 times · free to read
- Long-term kidney outcomes of semaglutide in obesity and cardiovascular disease in the SELECT trial (opens in a new tab) Nature Medicine, 2024 · cited 260 times · free to read
- Chronic kidney disease (opens in a new tab) Nature Reviews Disease Primers, 2025 · cited 237 times
From OpenAlex, an open index of research papers. Papers with at least one author at a U.S. institution, classified by subject; the subject covers the whole field, so related specialties share these lists. Citation counts change daily.
Sources: CMS NPPES (counts, sex, credentials), Medicare Care Compare (schools, graduation years, hospitals, telehealth), CMS Medicare Physician & Other Practitioners (2023) and Part D Prescribers (2024), CMS Open Payments (2025), ACGME program requirements (training length), OpenAlex (research), U.S. Census Bureau ACS 2020–2024 (population).