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Endocrine and metabolic disease care conveniently located in McKinney

Baylor Scott & White Endocrinology Specialists – McKinney is located in McKinney, TX. Vivienne Yoon, MD, Jennifer St. John, MD, and Sana Ullah, MD, are board-certified in internal medicine, endocrinology, diabetes and metabolism.

At Baylor Scott & White Endocrinology Specialists – McKinney, we realize the importance of involving our patients in their treatment plan. We strive to offer innovative management and treatment options that are individualized according to our patient's specific condition.

At this time we are only accepting physician-to-physician referrals.

Insurances accepted

Baylor Scott & White has established agreements with several types of insurance to ensure your health needs are covered.

Insurance listings are subject to change without prior notice. Please call the hospital or health plan to verify coverage information before scheduling your visit/procedure.
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  • University Mary Hardin-Baylor - (1)
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Insurance listings are subject to change without prior notice. Please call your physician's office or your health or insurance plan to verify coverage information prior to scheduling your visit or procedure. Not all members participating in contracted networks have "in network" access. In network participation may change from time to time without prior notice. Independent providers (which could include, for example only, anesthesiologists, radiologists, pathologists, emergency medicine physicians, advance practice professionals, and other independent providers of healthcare services) may deliver part of your care, and such providers may be considered out-of-network on your health and insurance plans even if the Facility may be considered in network. If you desire additional information as to the providers who may be involved in providing your care, you can either ask your treating provider (who may know some of the specialists or groups who could be involved) or you can request a list of Facility-based physician groups by calling the following toll free number: 1.877.810.0372. This list is updated annually and is subject to change without prior notice.


Your rights and protections against surprise medical bills

Endocrinology services

The endocrinologists here in McKinney provide consultation, diagnosis and management of endocrine and metabolic diseases.

Endocrine disorders involve the body's over- or under-production of certain hormones, while metabolic disorders affect the body's ability to process certain nutrients and vitamins.

Endocrinology and metabolic procedures and treatments we offer include:

  • Atherosclerosis assessment
  • Bone density testing
  • Dietary counseling
  • Glucose monitoring
  • Insulin pump placement and maintenance
  • Lipoprotein/cholesterol analysis

Conditions we treat include:

  • Calcium and skeleton mineralization and metabolism
  • Diabetes mellitus and obesity
  • Diseases of the parathyroid gland
  • Disorders affecting cholesterol and lipoprotein metabolism in relation to atherosclerosis
  • Disorders affecting the pituitary, thyroid, adrenal cortex and reproductive organs
  • Diseases of the adrenal glands
    • Cushing's syndrome
    • Addison's disease
  • Hypertension due to endocrine causes
  • Hypothyroidism
  • Parathyroid cancer
  • Thyroid cancer

Endocrine disorders include hypothyroidism, diseases of the parathyroid gland, diabetes mellitus and ovarian dysfunction (including polycystic ovary syndrome ), among others. Some examples of metabolic disorders include hyperlipidemia and rickets.

Pay bill

Baylor Scott & White Health is pleased to offer you multiple options to pay your bill. View our guide to understand your Baylor Scott & White billing statement.

We offer two online payment options:

Other payment options:

  • Pay by mail

    To ensure that your payment is correctly applied to your account, detach the slip from your Baylor Scott & White billing statement and return the slip with your payment. If paying by check or money order, include your account number on the check or money order.

    Please mail the payment to the address listed on your statement.

  • Pay by phone

    Payments to HTPN can be made over the phone with our automated phone payment system 24 hours a day, seven days a week. All payments made via the automated phone payment system will post the next business day. Please call 1.866.377.1650.

    If you need to speak to someone about a bill from a Baylor Scott & White Hospital, our Customer Service department is available to take payments over the phone from Monday through Friday from 8:00 AM - 5:00 PM and can be reached at 1.800.994.0371.

  • Pay in person

    Payments can be made in person at the facility where you received services.

Financial assistance

At Baylor Scott & White Health, we want to be a resource for you and your family. Our team of customer service representatives and financial counselors are here to help you find financial solutions that can help cover your cost of care. We encourage you to speak to a team member before, during or after care is received.

View financial assistance options

Mobile makes it easy
Just like we make it easy to get care when your child is sick or injured, our top-rated app, MyBSWHealth, can simplify keeping them healthy. The app lets you book appointments, message your pediatrician, view your child’s medical records and schedule virtual same-day care from your computer, smartphone or tablet.
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Patient forms

To ensure that your visit to our office is as convenient and efficient as possible, we are pleased to offer our registration forms online. The patient registration form may be completed electronically and printed for better legibility or completed manually.