Accepting patients
Affiliated with a Castle Connolly Top Hospital
Who is Dr. Bayer, Endocrinologist in Naperville, IL?
Dr. William Bayer, MD is an Endocrinologist, who primarily practices in Naperville, IL with 2 additional practice locations. He is board certified by the American Board of Internal Medicine. Dr. Bayer graduated from Loyola University Chicago Stritch School of Medicine and completed his residency at Loyola Univ Med Ctr, Endocrinology, Diabetes & Metabolism; Loyola Univ Med Ctr, Internal Medicine. He is a member of the Cadence Physician Group. Dr. Bayer is fluent in English, Italian, and Spanish, and is currently seeing new patients. Dr. Bayer’s practice accepts Medicare, Aetna, Cigna, UnitedHealthcare and other major insurance plans. To book an appointment or to confirm insurance options, please call Dr. Bayer’s office at (630) 924-4009.
What are Areas of Expertise for Dr. Bayer?
Dr. William Bayer, MD is a highly-rated, board-certified Endocrinologist known for expertly diagnosing, treating, and managing a wide array of related conditions or procedures. Utilizing the latest medical advancements and evidence-based practices, Dr. Bayer empowers patients to confidently navigate their health journey, specializing in Diabetes, Osteoporosis, Thyroid Disorders, or comprehensive wellness support. Serving the Naperville/IL community, Dr. Bayer is dedicated to enhancing lives through expert, patient-centered care.
Where did Dr. Bayer go to medical school and complete their residency?
Fellowship: Loyola University Medical Center
Residency: Loyola Univ Med Ctr, Endocrinology, Diabetes & Metabolism; Loyola Univ Med Ctr, Internal Medicine | Loyola University Affiliated Hospitals | Loyola University Medical Center Program
Medical School: Loyola Univ of Chicago Stritch Sch of Med, Maywood Il | Loyola University Chicago Stritch School of Medicine
Is Dr. Bayer board certified in Endocrinologist?
Yes, Dr. William Bayer, MD is board certified by the American Board of Internal Medicine
What languages does Dr. Bayer speak?
Dr. Bayer and their clinical team can communicate with patients in the following languages:
English
Italian
Spanish
What conditions does Dr. Bayer treat?
As a Endocrinologist, Dr. Bayer 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. Bayer. 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.
Also known as:
- Hypothyroidism
- Other Hypothyroidism
- Congenital hypothyroidism
- Hypothyroidism (Underactive Thyroid)
- Underactive Thyroid
- Low Thyroid Function
- Thyroid Gland Underactivity
ICD-10 Codes:
- E039: Hypothyroidism, unspecified
- E038: Other specified hypothyroidism
Also known as:
- Type 2 Diabetes
- Diabetes Complicationss
- Diabetes Type 2
- Type 2 diabetes
- Diabetes Mellitus Complications
- Diabetes Related Health Problems
- Advanced Diabetes
- Diabetes Mellitus Type 2
- Adult-Onset Diabetes
- Non-Insulin Dependent Diabetes
ICD-10 Codes:
- E118: Type 2 diabetes mellitus with unspecified complications
- E119: Type 2 diabetes mellitus without complications
Also known as:
- Vitamin D Deficiency
- Low Vitamin D Levels
- Lack of Vitamin D
- Hypovitaminosis D
ICD-10 Codes:
- E559: Vitamin D deficiency, unspecified
Also known as:
- High Cholesterol
- Cholesterol
- Triglycerides
- Hyperlipidemia
- High lipids
- Dyslipidemia
ICD-10 Codes:
- E785: Hyperlipidemia, unspecified
Also known as:
- Age-Related Osteoporosis
- Fractures
- Osteoporosis
- Senile Osteoporosis
- Primary Osteoporosis
- Bone Thinning from Aging
ICD-10 Codes:
- M810: Age-related osteoporosis without current pathological fracture
Also known as:
- Nontoxic Multinodular Goiter
- Thyroid Disease
- Multinodular Goiter
- Lumpy Enlarged Thyroid
ICD-10 Codes:
- E042: Nontoxic multinodular goiter
Also known as:
- Thyroid Cancer
- Thyroid Carcinoma
- Malignant Thyroid Nodule
- Thyroid Gland Cancer
ICD-10 Codes:
- C73: Malignant neoplasm of thyroid gland
Also known as:
- Multiple Site Bone Density and Structure Disorder
- Bone Density
- Bone Disease
- Widespread Bone Density Disorder
- Generalized Bone Structure Problem
- Multi-site Bone Disorder
ICD-10 Codes:
- M8589: Other specified disorders of bone density and structure, multiple sites
Also known as:
- Nontoxic Goiter
- Thyroid Disease
- Enlarged Thyroid Gland
- Simple Goiter
- Thyroid Swelling
ICD-10 Codes:
- E049: Nontoxic goiter, unspecified
Which procedures does Dr. Bayer perform as a Endocrinologist?
As a Endocrinologist, procedures performed by an Dr. William Bayer 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
For detailed information, please contact Dr. Bayer's office.
Does Dr. Bayer accept my insurance?
Dr. Bayer accepts most major insurance plans. Important: Please call our office at (630) 924-4009 before your appointment to verify that your specific plan and network are accepted.
What insurance plans does Dr. Bayer accept in Naperville, IL?
Dr. Bayer in Naperville, IL accepts plans from many carriers. While this list is updated regularly, it is not a guarantee of coverage.
Top Insurances
Aetna
Blue Cross Blue Shield
Capital Blue Cross
CMS
Corporate Services
CVS Health (formerly Aetna)
Elevance Health Inc. (formerly Anthem)
Express Scripts
Medicare
State of Georgia
View All Insurances
Where is Dr. Bayer's office located?
Dr. William Bayer's Primary Practice
636 Raymond Dr Ste 204
Naperville, IL 60563
(630) 924-4009
Recognitions
Memberships & Associations
Cadence Physician Group
Member
What is Dr. Bayer's NPI number?An National Provider Identifier (NPI) is a unique ID number that identifies doctors and healthcare providers nationwide.
Dr. Bayer's National Provider Identifier (NPI) number is 1528162898.
What common questions do patients ask about Dr. Bayer?
Here are answers to patients Frequently Asked Questions (FAQ’s) about Dr. Bayer
What is Dr. William Bayer's specialty?
Dr. Bayer is a Endocrinologist near Naperville, IL. 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. Contact Dr. Bayer to book an appointment today.
Is this Dr. William Bayer affiliated with a ranked Castle Connolly Top Hospital?
Yes, Dr. Bayer is affiliated with Northwestern Medicine Central DuPage Hospital 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
Where can I learn more about Endocrinologist?
Explore Endocrinologist with 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 William Bayer accepting new patients in Naperville, IL?
Yes, Dr. William Bayer is accepting new patients at this time.
Does Dr. William Bayer offer online booking?
Please contact Dr. Bayer's office at (630) 924-4009 for information about online booking, telehealth, or to schedule an appointment.
How can I make an appointment with William Bayer?
Please contact Dr. Bayer's office at (630) 924-4009 for information regarding telehealth appointment availability or for scheduling assistance.
Which board certifications does Dr. William Bayer have?
Dr. William Bayer is certified by the American Board of Internal Medicine.
Other Endocrinologist Near Naperville, IL
MC
Endocrinologist
Accepting patientsDr. Mary Codo, MD is an Endocrinologist, who primarily practices in Naperville, IL with 2 additional practice locations. She has been practicing for over 31 years and is board certified.
Naperville, IL
FV
Endocrinologist
Accepting patientsDr. Falguni Vasa, MD is an Endocrinologist, who primarily practices in Naperville, IL with 2 additional practice locations. She has been practicing for over 23 years and is board certified by the American Board of Internal Medicine.
Naperville, IL
UA
Endocrinologist
Accepting patientsDr. Unknown Amtul Shafi is an Endocrinologist, who primarily practices in Naperville, IL with 2 additional practice locations. She is board certified.
Naperville, IL