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Clemens Bergwitz, MD

Associate Professor of Medicine (Endocrinology)

Contact Information

Clemens Bergwitz, MD

Patient Care Location



Clemens W.H. Bergwitz, MD, is an endocrinologist at Yale Medicine who sees patients with primary hyperparathyroidism, general endocrine disorders, hyperthyroidism, thyroid nodules, adrenal disorder, hypophosphatemic disorders and hypogonadism.

Dr. Bergwitz’s characterizes the endocrine system as the human body’s own data messaging system. “It sends information to regulate some of our body’s most critical functions,” he says. In addition to treating patients, Dr. Bergwitz conducts research on many of these conditions, and his lab has worked on projects that test various therapies for hereditary endocrine disorders. “I am really a physician-scientist. My patients inspire my research, which eventually leads back to the bedside,” he says.

Dr. Bergwitz believes that patients should be the expert of their own illness. He strives to explain conditions and treatments in plain language so that patients not only understand their disorder, but also the biological mechanisms behind it. “I’m interested in providing my patients with the information they need to not only understand their condition, but to empower them to take good care of themselves,” he says.

Education & Training

  • Fellowship
    Massachusetts General Hospital (2006)
  • Residency
    Massachusetts General Hospital (2003)
  • Fellowship
    NICHD, NIH (2001)
  • Residency
    Hannover Medical School (1999)
  • Research Fellowship
    Massachusetts General Hospital and Harvard Medical School (1996)
  • MD
    Hannover Medical School (1993)
  • BA
    Wilhelm Gymnasium, Chemistry and Ancient Greek (1986)


  • TIO and other causes of hypophosphatemia 2022
    European Society of Endocrinology Clinical Update on Calcium and Bone 2022 online webinar series
  • Hereditary hypophosphataemic rickets with hypercalciuria
    Calgary, AB, Canada 2022
    19th Congress of the International Pediatric Nephrology Association (IPNA 2022)
  • Phosphate-sensing and related skeletal disorders
    Marseille, Provence-Alpes-Côte d'Azur, France 2020
    Phosphate-sensing and related skeletal disorders
  • Advances in FGF23 Signalling
    Brighton, England, United Kingdom 2018
    British Society for Endocrinology Annual Meeting
  • Metabolic and endocrine sensing of phosphate – insights from genetic disorders
    Nantes, Pays de la Loire, France 2017
  • Disorders of Phosphate Homeostasis and Tissue Mineralization
    Würzburg, BY, Germany 2016
    International Expert Workshop on Rare Bone Diseases
  • Phosphate Sensing: Two Sensors, a Metabolic and an Endocrine One?
    Atlanta, GA, United States 2016
    ASBMR 2016 Annual Meeting
  • Genetic approaches to understanding phosphate homeostasis and Disorders of Phosphate Homeostasis and Tissue Mineralization
    Dresden, SN, Germany 2015
    Endocrine Grand Rounds and Research Day
  • Renal phosphaturia and SLC34A3 mutations
    Zürich, ZH, Switzerland 2009
  • Renal Sodium-Phosphate Cotransporters in Human Disease
    Bethesda, MD, United States 2005
    NIH Inter-Institute Endocrine Grand Rounds, National Institute of Dental and Craniofacial Research, Craniofacial and Skeletal Diseases Branch, Bethesda, MD

Honors & Recognition

AwardAwarding OrganizationDate
Yale Center for Clinical Investigation Pilot on "The impact of phosphate metabolism on healthy aging"2019
O’Brien Center Pilot on “Role of Pyrophosphate in Nephrocalcinosis of Npt2a-/- Mice”2016, 2017, 2018
Young Investigator Award on “Role of the renal sodium-phosphate cotransporter NaPi-IIc in phosphate homeostasis”American Society for Clinical Investigation2007
Young Investigator Award on “Role of the renal sodium-phosphate cotransporter NaPi-IIc in phosphate homeostasis”National Kidney Foundation2007
Von-Recklinghausen-PreisGerman Endocrine Society1996

Professional Service

Gordon Conference on Physiology, Biology and Pathology of PhosphateSession Chair2023
Barron'sInterview with Neal Templin from Barron's on what seniors can do to avoid osteoporosis: “Osteoporosis Affects Many. What to Know—and How to Prevent It.”2022 - Present
Clinical Relevance of IV Iron-Associated Hypophosphatemia, Pharmacosmos Therapeutics Inc.Advisor2022 - Present
Deutsche Forschungsgemeinschaft (DFG)Ad-hoc Member2021 - Present
French National Research AgencyAd-hoc reviewer2021 - Present
PRMRP Musculoskeletal health (PRE-MSH-1), Department of DefenseAd-hoc Member2020 - Present
Research & Development, Pharmaceuticals Pediatric Development, Bayer AG, Berlin, GermanyAdvisor2020 - Present
Nature Scientific ReportsGuest Editor2019 - 2021
Skeletal Biology Development and Disease (SBDD), NIHAd-hoc Member2017 - Present
Association of OsteobiologyMember2016 - Present
Advances in Mineral Metabolism (AIMM)Board Member2016 - Present
American Society of Bone and Mineral Research (ASBMR)Member1993 - Present

Departments & Organizations