Endocrine and metabolic disease care conveniently located in McKinney

Baylor Scott & White Endocrinology Specialists – McKinney is located in McKinney, TX. Vivienne Yoon, MDJennifer 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.

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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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  • Baylor Scott & White Health Plan - (1)
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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

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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.