Dr. Dina Diehl, DO
Concierge Internal Medicine physician, Frisco, TX
Select Internal MedicineDr. Dina Diehl is a concierge internal medicine physician in Frisco, Texas, and founder of Select Internal Medicine.
Facts on this page last checked November 2026. How we check doctors
About Dr. Diehl
Dr. Diehl is board certified in internal medicine and obesity medicine. She has worked in outpatient medicine and previously served as a hospitalist. She earned her DO degree at the Philadelphia College of Osteopathic Medicine in 2003 and finished her residency at Summa Health System in Akron, Ohio in 2007.
She also received additional training at the Cleveland Clinic. She founded Select Internal Medicine, which blends internal and functional medicine in a concierge model. Patients can reach providers at any hour and get same-day appointments with short waits.
She focuses on finding the root cause of disease and building individualized treatment plans. She treats chronic conditions such as hypertension, diabetes and obesity, along with hormonal imbalances and gastrointestinal disorders. She uses advanced testing, including gut, hormone and genetic assessments.
She is a Certified Functional Medicine Provider. She enjoys traveling, running, golfing and skiing.
Membership and fees
Select Internal Medicine runs a concierge model with 24/7 access to physicians and unrushed appointments of any length needed.
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Questions patients ask
Does Dr. Diehl offer a membership?
Select Internal Medicine is a concierge practice. It offers 24/7 access to physicians and unrushed appointments of any length needed.
Is Dr. Diehl board certified?
Dr. Diehl is board certified in internal medicine and in obesity medicine.
Where did Dr. Diehl train?
She earned her medical degree at the Philadelphia College of Osteopathic Medicine in Philadelphia, Pennsylvania. She completed her residency at Summa Health System in Akron, Ohio, and received additional training at the Cleveland Clinic.
Where is Dr. Diehl's office?
Her practice, Select Internal Medicine, is in Frisco, Texas.
Does Dr. Diehl offer medical weight loss?
She provides medical weight loss with an approach that may include medications, peptides, supplements and lifestyle counseling.
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