Dr. Wim de Graaff

Internal Medicine Specialist

As an internist, I’m specialized in diseases of the internal organs, with special emphasis on endocrine diseases, such as thyroid disease and more rare disorders. In addition, I treat many patients with diabetes mellitus (diabetes) and osteoporosis (bone loss).

Obesity and diabetes are seen more often. The treatment and prevention of them are a huge challenge. I spend a lot of attention to inform about the lifestyle, like clean eating and mobility with the aim of encouraging patients.

Specialization/areas of interest

Endocrinology and Diabetes


Dutch and English.

Work experience

2020 – present Co-owner CareBalloon

2016 – present Medical head and coach, Medical Department “Leven & Pensioen” Achmea Interpolis.

2002 – 2016 Internist – endocrinologist, Tergooi Hospital Hilversum Trainer doctors in training, Tergooi Hospital Hilversum Acting trainer specialist in training, Amsterdam Medical Center

2000 – 2002 Internist / Fellow Department of Endocrinology and Metabolic Diseases, Leids University Medical Center

1999 – 2000 The Clinic Chief, Internal Medicine, Medical Center Leeuwarden


2002 Registration as Internist Endocrinologist

2000 Registration Doctor Internal Medicine

1994 – 2000 Internal Medicine Education, University Medical Center, Groningen

1993 Course ‘Teacher Training’, University Medical Center, Groningen

1987 – 1992 Medicine Education at the University of Groningen

Additional activities

1992 – 1994 Watson Dispute UMCG (Research Council for medical students)


Ph.D. in Medicine, title: “Tumor biological studies on adult testicular germ cell Tumors”. UMCG, 1992.

Medical Publications

Click here for an overview.