Dr Jonathan Katz
MBBChir MD FRCP
Diabetes & Endocrinology Specialist
34 years of experience
Bushey, WD23 1RD
(+3 more)
34 connections in healthcare
Skill endorsed
by Dr Piyush Jain, Dr Nirit Braha
Areas of expertise
Contact
Book
About Dr Jonathan Katz
Dr Jonathan Katz is a Consultant in Diabetes & Endocrinology, based at Barnet Hospital, which is part of the The Royal Free London NHS Trust. He has over 30 years experience in treating patients with Thyroid problems, Pituitary disorders, Diabetes and other hormone imbalances including Calcium disorders, Menopause, Testosterone Deficiency and Addison's Disease.
Dr Katz studied medicine at Cambridge University and University College London, qualifying in 1991. He specialised in Endocrinology, completing registrar training at UCLH, the Whittington Hospital and the Royal Free Hospital. During higher training he undertook a two year research fellowship for his MD thesis on polycystic ovary syndrome. Following that, he worked for 1 year as a registrar in Sydney, Australia before returning to teh Royal Free Hospital for his final resgistrar year. Dr Katz was appointed as a Consultant in Diabetes and Endocrinology in 2002.
Dr Katz works as a Consultant Endocrinologist for the Royal Free London NHS Foundation Trust, based at Barnet Hospital. In 2009, he was elected as a Fellow of the Royal College of Physicians (FRCP), an honour granted to consultants providing the highest standards of care. In 2019, Dr Katz was appointed as Regional Advisor for the Royal College of Physicians – this is an elected post with wider responsibilities : supporting training, ensuring new consultant posts fulfil Royal College standards, chairing regional conference updates for physicians and appointing College Tutors.
Dr Katz has a busy NHS Endocrinology practice, seeing over 300 new patients and over 1000 follow-up patients each year. In addition, he looks after inpatients at Barnet Hospital with diabetes emergencies and acute endocrine disorders.
Subspecialties
- Diabetes•
- Endocrinology
Areas of expertise
Click the bar to read reviews or skill endorsements
Registered with
General Medical Council
No. 3490022
Education
University of Cambridge
Medicine
Graduated 1991
Qualifications
- MB BChir - Cambridge University 1991
- MD - University of London 2001
- FRCP - Royal College of Physicians 2009
Languages spoken
- English
Consultation fees
- New appointment: £295
- Follow-up appointment: £195
Insurers
- General and Medical
- Freedom Health Insurance
- The Exeter
- Simply Health (Dental)
- Healix Health Services
- Cigna
- Bupa
- WPA
- Allianz Worldwide Care
- AXA Health
- Aviva Health
- Vitality
- The PHC
- Benenden Health
Location
All locations for Dr Jonathan Katz
(645)
Chase Farm, Enfield, United Kingdom, EN28SD
(385)
Cavell Drive, Uplands Park Rd, Enfield, London, United Kingdom, EN2 7PR
(273)
290 Centennial Ave, Elstree Borehamwood, London, United Kingdom, WD6 3SU
Reviews
I have been seeing Dr Katz for over 12 years. He always listens and takes the time to explain as necessary. He is straightforward and responsive to email communications. I have always been able to get an appointment within a reasonable timeframe. I highly recommend him.
Had a very good experience under Dr Katz. Always speaks in simple terms so you don’t feel overwhelmed.
Dr Katz was extremely thorough. His excellent explanations and recommendations are always clear and precise. His care and support over many years has been invaluable.
Dr.Katz was very kind when I saw him about my uncontrolled diabetes. He gave me some charts to follow which I did and I am waiting to hear from him what to do next. I was very impressed as my insurance would not cover this consultation and Dr Katz said he would keep costs to the minimum. very nice doctor and caring. Tessa Weber
Jonathan is a very kind and competent practitioner and always happy to listen or explain, as required. His knowledge is excellent and he has made a huge difference to maintaining my health
Easy and responsive communication by email. He is at his private practice I think one or two evenings per week at Spire Bushey but I’ve not had any problems getting an appointment at a reasonable time. Explains the condition and treatment in language I can understand. Helps sort out bookings for blood tests, MRI etc.
Dr Jonathan Katz has a very calm manner and takes time to listen and give advice , I trust his opinion and have been under him for many years. He dies not rush you out and is highly experienced in what he does . I feel safe under his care.
I am the Mother of a 44 year old autistic learning disabled man. I have complete confidence in the care my son receives from Dr Katz. Dr Katz has investigated any affects Simon may be experiencing from his medication. He has also addressed Simon’s weight problem with a very positive outcome. I am delighted with the care my son receives from Dr Katz.
Endorsements
Dr Katz is an excellent Endocrinologist and highly regarded for his clinical skills, knowledge, and patient-centred approach. I have referred several patients and Dr. Katz has provided timely, evidence-based opinions.
05 Jan 2026
Dr Piyush Jain
CardiologistDr Katz is excellent. He is kind, experienced and pays close attention to detail. As a Paediatrician and Endocrinologist myself, I recommend him to all my patients and colleagues who need advice from a sensible and skilled adult endocrinologist.
20 Dec 2025
Dr Nirit Braha
Paediatrician![Dr Jonathan Katz logo](data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="256" height="256"><rect fill-opacity="0"/></svg>)
Get to know Dr Jonathan Katz
FAQ
What are Dr Jonathan Katz's reviews like?
Dr Jonathan Katz's overall patient rating is 5 out of 5 stars on Doctify. This is based on 19 reviews.
What languages does Dr Jonathan Katz speak?
Dr Jonathan Katz speaks English
Where is Dr Jonathan Katz located?
Dr Jonathan Katz primarily practices at Spire Bushey Hospital, located at Heathbourne Road, Bushey, United Kingdom, WD23 1RD
See more locations
What are Dr Jonathan Katz working hours?
Dr Jonathan Katz is working Wednesday (16:00 - 18:00), Thursday (15:00 - 17:00)
Find where Dr Jonathan Katz operates today
Does Dr Jonathan Katz accept new patients?
Dr Jonathan Katz generally accepts new patients.
Get in touch with this specialist to enquire as a new patient
Visit provider's website