Specializing in Concierge Internal Medicine in Frisco, TX

Patient Portal

What is Concierge Medicine? 

Signature Internal Medicine is a superior internal medicine practice in Frisco, TX, led by Humera Ahmed, MD, and Dina Diehl, DO. We offer 24/7 access to physicians any time patients need them. Providers spend as much time as patients desire to ensure exceptional care so appointments never feel rushed.

Learn more.

Medical Services

Memberships/Awards

Dr. Diehl


  • Board Certified in Internal Medicine
  • Board Certified in Obesity Medicine 
  • Certified Functional Medicine Provider
  • American College of Physicians
  • Certified Functional Medicine Provider 
  • Member of Institute of Functional Medicine
  • Member of American Medical Association
  • National Committee for Quality Assurance

      Excellence in Diabetes Care 2017

  • Board member at Texas Health Presbyterian, 2010
  • Certificate of Recognition for Delivery of Quality Cardiovascular and Stroke Care 2017-2020
  • America's Most Honored Professionals 2019 - Top 5%
  • America's Most Honored Professionals 2018 - Top 1%
  • America's Most Honored Professionals 2017 - Top 5%
  • Compassionate Doctor 2015
  • Compassionate Doctor 2016
  • On-Time Physician Award - 2016
  • On-Time Physician Award - 2015
  • Patients' Choice 2016
  • Patients' Choice 2018

Dr. Ahmed


  • Board Certified Internal Medicine 
  • Board Certified in Obesity
  • Member of Institute of Functional Medicine
  • D-Magazine Best Internist in 2018, 2019 and 2023
  • National Committee for Quality Assurance Excellence in Diabetes Care, 2017
  • Recognized for Delivery of Quality Cardiovascular and Stroke Care, 2017-2020
  • Board member at Texas Health Presbyterian, 2010
  • Member of the American College of Physicians
  • Top doctors of America selected in 2022
  • America's Most Honored Doctors - Top 5% 2022
  • America's Most Honored Doctors - Top 5% 2021
  • America's Most Honored Doctors 2020 - Top 5%
  • Compassionate Doctor 2020
  • On-Time Physician Award - 2020
  • Patients' Choice 2020
  • Patients' Choice 2019
  • Biote Certified

Memberships/Awards

Dr. Diehl


  • Board Certified in Internal Medicine
  • Board Certified in Obesity Medicine 
  • Certified Functional Medicine Provider
  • American College of Physicians
  • Certified Functional Medicine Provider 
  • Member of Institute of Functional Medicine
  • Member of American Medical Association
  • National Committee for Quality Assurance

      Excellence in Diabetes Care 2017

  • Board member at Texas Health Presbyterian, 2010
  • Certificate of Recognition for Delivery of Quality Cardiovascular and Stroke Care 2017-2020
  • America's Most Honored Professionals 2019 - Top 5%
  • America's Most Honored Professionals 2018 - Top 1%
  • America's Most Honored Professionals 2017 - Top 5%
  • Compassionate Doctor 2015
  • Compassionate Doctor 2016
  • On-Time Physician Award - 2016
  • On-Time Physician Award - 2015
  • Patients' Choice 2016
  • Patients' Choice 2018

Dr. Ahmed


  • Board Certified Internal Medicine 
  • Board Certified in Obesity
  • Member of Institute of Functional Medicine
  • D-Magazine Best Internist in 2018, 2019 and 2023
  • National Committee for Quality Assurance Excellence in Diabetes Care, 2017
  • Recognized for Delivery of Quality Cardiovascular and Stroke Care, 2017-2020
  • Board member at Texas Health Presbyterian, 2010
  • Member of the American College of Physicians
  • Top doctors of America selected in 2022
  • America's Most Honored Doctors - Top 5% 2022
  • America's Most Honored Doctors - Top 5% 2021
  • America's Most Honored Doctors 2020 - Top 5%
  • Compassionate Doctor 2020
  • On-Time Physician Award - 2020
  • Patients' Choice 2020
  • Patients' Choice 2019
  • Biote Certified

Patient Reviews

EXCELLENT!

★★★★★

Lanette H. | Dec 20, 2023

GREAT COMMUNICATION. VERY GOOD CALL.

★★★★★

Joseph D. | Nov 30, 2023

BEST DOCTOR EVER

★★★★★

Raymond M. | Oct 25, 2023

SHE LISTENS & DISCUSSES YOUR CURRENT SICKNESS. THEN SUGGESTS THINGS FOR YOU TO DO TO HELP GET BETTER & SHE EXPLAINS WHAT MEDICINES SHE IS PRESCRIBING AND HOW THEY SHOULD HELP. THEN IN A COUPLE DAYS SHE CALLS YOU TO SEE HOW YOU ARE DOING & MAKES FURTHER SUGGESTIONS.

★★★★★

Lila A. | Aug 16, 2023

QUICK, DETAILED, AND COMPREHENSIVE APPOINTMENT WITH HER!

★★★★★

Umar A. | Jul 24, 2023

IT WAS GREAT

★★★★★

Spencer P. | Jul 15, 2023

DR. AHMED IS VERY CARING PHYSICIAN.

★★★★★

Artel K. | May 26, 2023

AS AN EXECUTIVE WITH A BUSY SCHEDULE, WORKING WITH DR. DIEHL AS A PATIENT CAN ONLY BE DESCRIBED AS : FOCUSED, PRECISE, REASSURING, AND CONFIDENT. I APPRECIATE THE FLEXIBILITY AND SUPPORT DR DIEHL AND THE ENTIRE SIGNATURE TEAM PROVIDES. I ALWAYS WALK AWAY FEELING BETTER. CHEERS !

★★★★★

Gregory M. | May 01, 2023

VERY, VERY THOROUGH DURING YOUR OFFICE VISIT. REALLY LISTENS AND TAKES THE TIME NEEDED WHEN YOU ARE WITH HER WHICH IS SO REFRESHING AND MAKES ME CONFIDENT I AM GETTING THE BEST CARE.

★★★★★

Carmen W. | Apr 27, 2023

Insurances

We accept most insurance providers. If you have specific questions regarding your coverage, please contact us for additional information.

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