Dr. Dina DiehlDO

Internal Medicine

at Select Internal Medicine — Frisco, TX

About

Dr. Dina Diehl practices concierge internal medicine and functional medicine at Select Internal Medicine in Frisco, TX. She works alongside Dr. Humera Ahmed with a shared focus on root-cause medicine and preventive care. Dr. Diehl is also Biote-certified in bioidentical hormone replacement therapy.

Her clinical interests include anti-aging and longevity, gut microbiome health, IBS, immune optimization, and inflammation. She is passionate about the intersection of lifestyle, nutrition, and long-term health outcomes.

Education & Training

Additional Training

Biote certification in bioidentical hormone replacement therapy

Conditions Treated

hormonal imbalances
IBS
gut health issues
inflammation
diabetes
hypertension
thyroid disease
high cholesterol
osteoporosis
kidney disease
COPD
GERD

Who is Dr. Diehl right for?

Dr. Diehl is a strong fit for adults seeking a root-cause approach to chronic health concerns. Patients dealing with hormonal imbalances, gut issues, or IBS benefit from her functional medicine training. She works well with those focused on longevity, anti-aging, and immune health. Adults interested in nutrition-driven care and lifestyle medicine will find her approach especially useful.

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Frequently Asked Questions

Dr. Diehl specializes in concierge internal medicine, functional medicine, and preventive medicine. Her clinical focus includes gut microbiome health, hormonal balance, immune optimization, and longevity. She is also Biote-certified in bioidentical hormone replacement therapy.

Dr. Diehl holds a Doctor of Osteopathic Medicine degree and practices internal medicine with a functional medicine approach. She is also Biote-certified in bioidentical hormone replacement therapy.

Dr. Diehl treats a wide range of conditions including hormonal imbalances, thyroid disease, IBS, gut health issues, and inflammation-related conditions. She also manages diabetes, hypertension, high cholesterol, and osteoporosis. Her preventive focus means she works proactively with patients on chronic disease risk.

Dr. Diehl looks for the root causes behind a patient's symptoms rather than treating each issue in isolation. She integrates lifestyle, nutrition, and advanced diagnostics into her care plans. Her functional medicine training shapes how she addresses chronic and complex health concerns.

Yes, Dr. Diehl offers bioidentical hormone replacement therapy and holds Biote certification in this area. She evaluates hormonal imbalances as part of a comprehensive view of each patient's health. BHRT is one component of her broader approach to longevity and preventive care.

Dr. Diehl has a strong clinical interest in gut microbiome health and IBS. She incorporates gut health assessment into her functional medicine evaluations. The practice also offers gut health and SIBO testing to support this area of care.

Dr. Diehl works best with adults who want a thorough, investigative approach to their health. Patients managing hormonal issues, digestive problems, or chronic inflammation benefit most from her functional medicine background. Those focused on anti-aging and long-term wellness are also a strong fit.

Doctor profile last updated March 21, 2026