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Medical team of the General Practice in Kleve

Two physicians with complementary expertise in general medicine, nutritional medicine, internal medicine and pulmonology.

Our Physicians

The people behind your care.

Two doctors with complementary specialisations – united by an approach that takes time, thinks in context, and places the person at the centre.

General Medicine · Additional qualification: Nutritional Medicine

Dr. medic Diana Mihaela Behler

Specialist in General Medicine · Additional qualification: Nutritional Medicine

Diana Behler completed her medical training in Romania, where the close doctor–patient relationship is part of a long tradition. Following further qualifications in Germany, she specialised in nutritional medicine – a field she considers inseparable from genuine primary care.

Her consultations go deep: she asks about lifestyle, sleep, stress, and nutrition not as an afterthought, but as core diagnostic dimensions. Every patient receives her full attention – and the time that real medicine requires.

Qualifications

  • Dr. medic Diana Mihaela Behler, MBA
  • Specialist in General Medicine
  • Additional qualification: Nutritional Medicine
  • Travel and vaccination medicine
  • MBA in International Healthcare Management, Frankfurt School of Finance & Management
  • Functional Medicine

Medical Focus Areas

  • Preventive medicine
  • Cardiometabolic medicine
  • Nutritional and metabolic medicine
  • Women’s health
  • Weight management and obesity medicine
  • Executive Health & Longevity
  • Functional Medicine

Languages

  • German
  • English
  • French
  • Spanish

Memberships

  • German College of General Practitioners and Family Physicians (DEGAM)
  • German Society for Nutritional Medicine (DGEM)
  • European Society for Clinical Nutrition and Metabolism (ESPEN)
  • German Medical Women’s Association
  • Centre for Travel Medicine (CRM)
Health emerges from the interaction of prevention, nutrition, metabolism, lifestyle and individual medical care. Her aim is evidence-based, personalised medicine that identifies risk factors early, makes complex connections understandable and develops long-term strategies for health, performance and quality of life.
“I want to understand why someone becomes ill – not just what they have. That is the real difference.”
General MedicineNutritional MedicineChronic ConditionsPreventive Care
Internal Medicine · Sleep Medicine

Dr. med. Paul-Georg Behler

Specialist in Internal Medicine · Pulmonology · Sleep Medicine

Dr. Paul-Georg Behler is an internist whose clinical background spans pulmonology and sleep medicine – two disciplines that intersect with almost every chronic condition. He brings specialist-level depth to the general practice setting, enabling diagnostics and treatment that usually require a separate referral.

His approach is systemic: he looks for patterns across organ systems, considers night-time physiology as seriously as daytime symptoms, and takes the time needed to form a complete clinical picture.

Qualifications

  • Dr. med. Paul-Georg Behler
  • Lecturer at the Medical Faculty of Düsseldorf
  • Specialist in Internal Medicine
  • Specialist in Pulmonology
  • Specialist in Sleep Medicine
  • Specialist in Allergology
  • Respiratory and ventilation medicine
  • Additional qualification in Environmental Medicine

Medical Focus Areas

  • Pulmonology, sleep medicine and allergology
  • Environmental medicine and ventilation medicine
  • Chronic respiratory disease
  • Preventive medicine
  • Functional Medicine

Special Expertise

  • Airway and lung diseases: asthma, COPD, chronic cough, interstitial lung diseases, sarcoidosis, pulmonary hypertension and complex pulmonary conditions
  • Sleep medicine: obstructive sleep apnoea, sleep-related breathing disorders, chronic insomnia, non-restorative sleep, daytime fatigue and exhaustion
  • Allergology and environmental medicine: allergic airway disease, food allergies, food intolerances and chronic mucosal or respiratory complaints
  • Internal medicine: arterial hypertension, coronary heart disease, heart failure, diabetes mellitus, lipid disorders, metabolic syndrome and multimorbid patients

Languages

  • German
  • English
  • Dutch
  • French

Memberships

  • German Respiratory Society (DGP)
  • European Respiratory Society (ERS)
  • German Society of Internal Medicine (DGIM)
  • German Society for Allergology and Clinical Immunology (DGAKI)
  • German Sleep Society (DGSM)
  • Association of Pulmonological Clinics (VPK)
Dr. Behler brings more than 30 years of clinical experience in senior and chief physician positions in internal medicine and pulmonology. He is one of the experienced pioneers of German sleep medicine and was involved early in establishing and developing sleep-medicine diagnostics and therapy. His goal is evidence-based, interdisciplinary and patient-centred medicine that connects diagnostics, prevention and individual treatment.
“Symptoms are often signals of a larger connection. Understanding it – that is my task.”
Internal MedicinePulmonologySleep MedicineLong-term Management
2×
Medical specialisations
under one roof
30+
Minutes per appointment
as standard
6+
Clinical focus areas
covered in-house
3×
Locations in the
Lower Rhine region
Our Philosophy

Medicine with time –
because there is no other kind.

Four principles that guide every consultation, every diagnosis, and every treatment plan we develop together with our patients.

01

Causes, not symptoms

We do not suppress what the body signals. We investigate the underlying causes to address conditions at their root – sustainably and with lasting effect.

02

Individual, not standard

Every patient is different – in biology, in lifestyle, in history. Our treatments are tailored to the person, never to a statistical average.

03

Prevention first

The most effective treatment is the one that is no longer needed. We invest in thorough diagnostics and early intervention before illness becomes entrenched.

04

Continuity of care

We build long-term relationships with our patients. Your medical history is known to us – not as a record number, but as the story of a person we accompany over time.

Medical expertise

Two medical perspectives for structured primary care

Dr. medic Diana Mihaela Behler contributes specialist expertise in general medicine and nutritional medicine. Dr. med. Paul-Georg Behler contributes specialist expertise in internal medicine and pulmonology. Their complementary experience supports clear assessment, prevention and coordinated care in Kleve.

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Professional responsibility: Medical information on these pages is reviewed by the physicians named above. Last updated: July 2026.

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