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Doctor and Patient

Diabetes Services

One Hour Initial Diabetic Assessment | CDC-Certified Diabetes Care | Insurance Accepted

Exceptional Care for Diabetes 

Reach out to the medical professionals at US Diabetes Care for efficient diabetic services. We treat patients age 10 years and above. No referrals are needed as we work with your Primary Care Physician. Call today to schedule an appointment.  


Every diabetes diagnosis is unique, we spend time getting to know you as a person, your environment, family life and stressors so we can provide you with the individualized care and support you deserve. We will ask the questions below.

  • Have you ever been treated for diabetes or have a strong family history?

  • Is your A1C greater than 6.5?

  • Are you a Type 1 or a Type 2 diabetic on an insulin pump?

  • Do you have diabetes and struggle with weight loss?

After our unique diagnosis and thorough evaluation of your medical history and reports, we provide you with the best medical care possible.

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Comprehensive Diabetic Care & Education

  • Initial one hour diabetes assessment

  • Group diabetes sessions to provide extensive education about self-care

  • Prescribe right medications

  • Partnership with labs to perform quick diabetes tests

We accept most insurance with no speciality co-pay. Don't get stuck to an insulin pump. With proper education and medical care, you'll live a happier and healthier life.


Daniel Castro, M.D., FACP, CDCES, Dipl. ACLM

Medical Director
CDCES Certified 

Internal Medicine / Lifestyle Medicine


Born in New York and raised in California and Chile has given Dr. Castro the ability to adapt to multiple cultures. Completing his undergraduate study at California State University, Northridge with a double bachelor's degree in Biology and Chemistry. His medical education was at Loma Linda University, continuing his residency program specializing in Internal Medicine. Once this program was completed, he became Chief Resident and then joined the Internal Medicine and Family Medicine faculty. This is where he developed his passion for teaching and working with students and residents. 


Dr. Castro held multiple leadership roles over the years, both in his Church as well as his professional career. For many years, he served as co-host of a Spanish radio show on health-related topics in Southern California. He and his wife are very involved locally with Church and teaching health seminars and cooking classes for the community. Highlights of his professional roles include Chief of General Internal Medicine at Loma Linda Veterans Administration Medical Center, working as overseer for the physicians in the clinics and hospital settings. Most recently, the Lead Medical Officer for the Morristown Veterans Administration Clinic and is now transitioning as Medical Director for US Diabetes Care.


Over the last several years, Dr. Castro has developed a growing interest in diet, lifestyle, and health outcomes. He completed Board Certifications in Lifestyle Medicine in 2019 to complement his Board Certifications in Internal Medicine and Geriatric Medicine. He is CDCES certified which means he is a Certified Diabetes Care and Education Specialist. He wishes to integrate his Internal Medicine skills with Lifestyle Medicine with those patents that desire to work towards better health by making wise lifestyle choices and to help battle the diabetes epidemic. 


Dr. Castro, his wife, and their children enjoy spending time outdoors in the garden, on his farm, hiking, traveling, and camping.

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Joyce Shea


Dr. Joyce Shea is a Board-Certified Acute Care Registered Nurse Practitioner. She received her Master of Science in Nursing and Doctorate of Nursing Practice from the University of Alabama in Huntsville. During her Doctorate Studies she did extensive research in prevention of coronary artery disease in Type 2 Diabetes in primary care settings devising a checklist to ensure proper screenings were completed for patients with diabetes.

She taught Master-level nursing students from the University of Alabama, University of Alabama in Huntsville, University of Alabama in Birmingham, Walden University, Troy State University, South University in Montgomery, and Mississippi University for Women. Dr. Joyce Shea has extensive medical experience as an Intensive Care, Cardiovascular Care and Emergency Department nurse. 


She and her husband, Thomas, relocated to the Shoals in 1987, as Thomas is originally from the Shoals. They have 2 grown children and 4 grandchildren. Dr. Joyce Shea hails from East Tennessee and has relocated back to our area from the Shoals.


Dr. Shea has a passion and love for her patients and is a perfect fit for the U.S. Diabetes Care Love, Hope, Family team! 


Jessica Singleton


Family Nurse Practitioner


Jessica Singleton is an ANCC board-certified Family Nurse Practitioner. She completed her associate degree of Science General Studies at Walters State Community College, a bachelor's degree of Science in Nursing at Lincoln Memorial University. She then earned her Master of Science Degree in Nursing at Carson-Newman University. She began working at US Diabetes Care in May of 2019 and later that year, welcomed a new addition to her family - a baby boy. Before working at US Diabetes Care, Jessica served part-time as a Volunteer FNP for Helping Hands Clinic in Morristown, TN, and later with Mountain Hope Clinic in Sevier County. In 2020, Jessica received her CDCES which stands for Certified Diabetes Care and Education Specialist. 


She has lived in Morristown for 20 years and is married and has 3 sweet sons. Professionally, her goals are to educate and empower patients and help them to have the necessary information to make well-informed choices regarding their care. Philosophy of treatment in her practice is "an ounce of prevention is worth a pound of cure". She stresses the importance of making the best lifestyle choices for optimal health. She is very grateful to be able to serve others and assist them to lead their best lives.

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William T. Allred, M.D.

Neurology- Brain Health

Dr. Allred is originally from a small town near Augusta, Georgia. At the age of 17, he joined the Army and is a Desert Storm veteran. While in the Army, he served as a computer technician. He then spent several years in Germany as an operating room nurse after completing nursing school there.


After returning home to Georgia, he graduated summa cum laude with a degree in Biology at Augusta State University and was accepted to the Medical College of Georgia. Before beginning the medical school program, he joined the Air Force as a second lieutenant. He completed his residency in Neurology at the Walter Reed National Capital Consortium in Washington, DC.


He later served as the Department Chief of Neurology and Sleep Medicine at the United States Air Force Academy. He resigned from the Air Force at the rank of major in 2012. Since then, he has assisted many different locations as a board-certified Neurologist and Sleep Medicine specialist.

Dr. Allred is excited to be joining U.S. Diabetes Care to care for our patient’s brain health.  This will include Type III Diabetes which is Alzheimer’s/Vascular Dementia.  Diabetes has a direct effect on cognitive function and this will be his primary focus of patient care.  We have BrainView Diagnostic Testing available on site and Dr. Allred will be evaluating and interpreting these tests for review with patients.

Stay in Touch



P: (423) 616-0625

2231 Sand Stone Dr

Morristown, TN 37814

Hours of Operation

Monday: 8:00 AM - 6:30 PM
Tuesday: 8:00 AM - 6:30 PM

Wednesday: 8:00 AM - 6:30 PM

Thursday: 8:00 AM - 6:30 PM

Friday: Closed

Saturday: Closed

Sunday: Closed

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