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Baylor Scott & White Endocrinology Specialists – McKinney

EndocrinologyMcKinney, TX

★★★★★4.5/5295 reviews across 3 platforms

Ratings by platform

  • Healthgrades (Dr. Vivienne Yoon): 4.6/5 stars (165 ratings) (165 reviews)
  • Healthgrades (Dr. Sana Ullah): 4.9/5 stars (60 ratings) (60 reviews)
  • Healthgrades (Dr. Jennifer St John): 4.1/5 stars (70 ratings) (70 reviews)

What patients say

Patients praise

  • Providers are frequently praised for being knowledgeable, thorough, and professional
  • Many patients feel their concerns are listened to and addressed clearly
  • Positive feedback regarding the quality of medical care and treatment management

Common complaints

  • Reports of unprofessional, rude, or dismissive administrative and front desk staff
  • Concerns regarding office communication, appointment scheduling, and patient portal requirements
  • Isolated reports of negative experiences with specific providers regarding bedside manner and listening skills

In patients' words

"Patients consistently praise Dr. Vivienne Yoon for being an exceptional listener who takes time to understand their concerns and involves them in treatment decisions."

WebMD (Dr. Vivienne Yoon)

"The problem is the haphazard, rude, incompetent, bullying... and unprofessional mean girls who work in that office treated me with unbelievable disrespect."

WebMD review (Dr. Jennifer St. John)

How these reviews were compiled

Synthesized from public patient-review platforms as of Jul 11, 2026 — sources: [1][2][3][4][5][6][7][8].

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