We are still there for you from Monday to Friday from 7:00 - 18:00 & Saturday from 09:00 - 12:00!

Please come to your examination with a mouth-nose protection mask. 

Our doctors can also be reached by phone, email or in the context of a video consultation - more detailed information can be found on the page of the respective specialist!

Your contacts for internal medicine Villa Medica in Mödling

In our medical center Dr. Christa Oliveira-Sittenthaler and Dr. Johannes Thomas are at your disposal for the field of internal medicine. Whether diabetic attitude, preventive examinations or diagnosis and therapy of osteoporosis: make an appointment at the Villa Medica to clarify complaints.

The doctors

Dr. Christa Oliveira-Sittenthaler

Our physician for internal medicine and rheumatology was senior physician at the Heart Jesus Hospital from 2009 to 2015 and subsequently chief physician in the Social Ministry Service. Since May 2018 she has been head of PVA's rehabilitation centre in Laab im Walde. As a specialist for the treatment of rheumatic diseases and osteoporosis, Dr. Oliveira-Sittenthaler is your contact if you have any complaints in these areas. The close interdisciplinary cooperation with our orthopaedists, dermatologists and other specialists enables a successful and rapid clarification of your complaints and tailor-made and state-of-the-art therapies are used. With the support of our team of therapists, we can offer you optimal care on the road to recovery.

Dr. Johannes Thomas

Dr. Thomas is a general practitioner as well as a specialist in internal medicine. He is also a visiting professor at the Medical University of Vienna and holds a diploma from the Medical Association for Nutritional Medicine. His focus is on metabolic diseases, high blood pressure therapies, lipid metabolism disorders, preventive examinations for all health insurance companies, nutritional medicine, internal sports medicine consultation, surgical release examinations, diabetes settings, vaccinations and metabolic coaching.

Our services

Within the scope of our general internal services, we offer you, for example, an internal assessment before surgery and risk evaluation, an optimal adjustment for diabetes - i.e. optimisation of sugar control, insulin therapy, oral antidiabetic therapy and FIT therapy - as well as personal, individual diagnosis analysis and consultation, blood pressure adjustment, medication management, preventive examinations in the field of internal diseases with a special focus on diabetes mellitus, cardiovascular diseases and osteoporosis.


One of the focal points of our practice in the field of internal medicine is rheumatology. We carry out laboratory analyses, clinical examinations and the interpretation of X-ray findings and other examinations. In addition, we apply various infiltration techniques individually. We are also happy to offer you the long-term treatment of rheumatological diseases. Therapy is carried out with biologics. In osteoporosis, too, we care for you with a careful diagnosis and individual therapy. We work together interdisciplinary: with dermatologists in patients suffering from collagenosis as well as with orthopaedists when surgical intervention is necessary.