DJ
Accepting patients
Affiliated with a Castle Connolly Top Hospital
Who is Dr. John, Endocrinologist in Lake Mary, FL?
Dr. Dieula John, MD is an Endocrinologist, who primarily practices in Lake Mary, FL with 2 additional practice locations. Dr. John is fluent in English, and is currently seeing new patients. Dr. John’s practice accepts Medicare and other major insurance plans. To book an appointment or to confirm insurance options, please call Dr. John’s office at (407) 373-3809.
What languages does Dr. John speak?
Dr. John and their clinical team can communicate with patients in the following languages:
English
What conditions does an Endocrinologist like Dr. John typically treat?
As an Endocrinologist, Dr. John diagnoses, treats, and manages a wide range of conditions. This condition information is derived from anonymized insurance claims and highlights the medical conditions most commonly treated by Dr. John. It provides insight into the doctor’s areas of experience and expertise based on real-world patient encounters from the past two years, updated quarterly. Learn more about our claims-based healthcare methodology.
Also known as:
- Type 2 Diabetes with High Blood Sugar
- Type 2 Diabetes
- Diabetes Type 2
- Hyperglycemia
- Type 2 diabetes
- Diabetic Hyperglycemia
- High Blood Glucose
- High Sugar Levels
- Diabetes Mellitus Type 2
- Adult-Onset Diabetes
- Non-Insulin Dependent Diabetes
ICD-10 Codes:
- E1165: Type 2 diabetes mellitus with hyperglycemia
- E119: Type 2 diabetes mellitus without complications
Also known as:
- Hypothyroidism
- Congenital hypothyroidism
- Hypothyroidism (Underactive Thyroid)
- Underactive Thyroid
- Low Thyroid Function
ICD-10 Codes:
- E039: Hypothyroidism, unspecified
Also known as:
- Sepsis
- Blood Poisoning
- Septicemia
- Systemic Bacterial Infection
ICD-10 Codes:
- A419: Sepsis, unspecified organism
Also known as:
- Type 1 Diabetes with High Blood Sugar
- Diabetes Type 1
- Hyperglycemia
- Type 1 diabetes
- Diabetic Hyperglycemia
- High Glucose in Type 1 Diabetes
- High Blood Sugar Episode
ICD-10 Codes:
- E1065: Type 1 diabetes mellitus with hyperglycemia
Also known as:
- Nontoxic Multinodular Goiter
- Thyroid Disease
- Multinodular Goiter
- Lumpy Enlarged Thyroid
ICD-10 Codes:
- E042: Nontoxic multinodular goiter
Also known as:
- Low Blood Sugar
- Hypoglycemia
- Low Blood Glucose (Hypoglycemia)
- Blood Sugar Drop
- Sugar Crash
ICD-10 Codes:
- E162: Hypoglycemia, unspecified
Also known as:
- Hashimoto's Disease
- Thyroid Disease
- Hashimoto's disease
- Autoimmune thyroiditis
- Chronic lymphocytic thyroiditis
- Hashimoto's thyroiditis
ICD-10 Codes:
- E063: Autoimmune thyroiditis
What procedures does an Endocrinologist like Dr. John typically perform?
As an Endocrinologist, procedures performed by Dr. Dieula John may include:
- Adrenal Surgery
- Comparative Genomic Hybridization
- D and C / Vacuum Aspiration
- Diabetes Blood Sugar Management
- Diabetes Care - Kidney Disease Monitoring
- Diabetes Consultation
- Doppler Ultrasound
- Egg Freezing/ Fertility Preservation
Please contact Dr. John's office directly to confirm care for your specific procedure, for more information, or to schedule a consultation.
Does Dr. John accept my insurance?
Dr. John accepts most major insurance plans. Important: Please call our office at (407) 373-3809 before your appointment to verify that your specific plan and network are accepted.
What insurance plans does Dr. John accept in Lake Mary, FL?
Dr. John in Lake Mary, FL accepts plans from many carriers. While this list is updated regularly, it is not a guarantee of coverage.
Top Insurances
All Other Third Party
Centene Corporation
Cigna Group
CVS Health (formerly Aetna)
Guidewell Mutual Holding Corporation
Humana
Medicare
Oscar Health
UnitedHealth Group
Unknown
View All Insurances
Where is Dr. John's office located?
Dr. Dieula John's Primary Practice
525 Technology Park Ste 109
Lake Mary, FL 32746
(407) 373-3809
What is Dr. John's NPI number?An National Provider Identifier (NPI) is a unique ID number that identifies doctors and healthcare providers nationwide.
Dr. John's National Provider Identifier (NPI) number is 1861954265.
What common questions do patients ask about Dr. John?
Here are answers to patients Frequently Asked Questions (FAQ’s) about Dr. John
What is Dr. Dieula John's specialty?
Dr. John is a Endocrinologist near Lake Mary, FL.
What does an Endocrinologist do?
An internist specializing in disorders of the endocrine glands, including the thyroid and adrenal glands. This specialist also manages a range of conditions such as diabetes, metabolic and nutritional disorders, obesity, pituitary disorders, and menstrual and sexual health issues.
Is this Dr. Dieula John affiliated with a ranked Castle Connolly Top Hospital?
Yes, Dr. John is affiliated with Adventhealth Ocala which is a Castle Connolly Top Hospital. Castle Connolly Top Hospitals are healthcare institutions recognized for their excellence in specific medical procedures and overall patient care. They are identified through a rigorous peer nomination process, evaluating factors like patient outcomes, quality of care, and expertise. The list recognizes hospitals that excel in 20 or more specific medical procedures, representing the top 25% nationwide. Castle Connolly Top Hospitals
When to see an Endocrinologist?: Guides for symptoms, conditions, and treatments
Understand your symptoms and know when it’s time to see an Endocrinologist. Explore insights from trusted medical experts on EverydayHealth.com, where you'll find the most relevant content and helpful condition guides for up-to date information about symptoms, causes, diagnosis, treatment and more. See all our health guides to find trusted information on medical conditions from our experts at Everyday Health.
Is Dieula John accepting new patients in Lake Mary, FL?
Yes, Dr. Dieula John is accepting new patients at this time.
Does Dr. Dieula John offer online booking?
Please contact Dr. John's office at (407) 373-3809 for information about online booking, telehealth, or to schedule an appointment.
How can I make an appointment with Dieula John?
Please contact Dr. John's office at (407) 373-3809 for information regarding telehealth appointment availability or for scheduling assistance.
Other Endocrinologist Near Lake Mary, FL
VR
Endocrinologist
Dr. Victor Roberts, MD is an Endocrinologist, who primarily practices in Lake Mary, FL with 1 additional practice location. He has been practicing for over 40 years and is board certified.
Lake Mary, FL
MB
Pediatric Endocrinologist
Dr. Matthew Benson, MD is a Pediatric Endocrinologist, who primarily practices in Lake Mary, FL with 2 additional practice locations. He is board certified.
Lake Mary, FL

Pediatric Endocrinologist
Dr. Joshua Yang, MD is a Pediatric Endocrinologist, who primarily practices in Orlando, FL with 2 additional practice locations. He is board certified.
Orlando, FL