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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

Medical Director

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 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. 


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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Mary Serbin


Family Nurse Practitioner


Mary Serbin is an ANCC board certified Family Nurse Practitioner. She completed her Bachelor of Science Nursing degree at University of Tennessee, Knoxville, TN and her Master’s degree in nursing from Carson-Newman University in Jefferson City, TN.

Mary joins the team at U.S. Diabetes Care & U.S. Diabetes Care & Surgical Specialty with over 40 years experience in the medical field. Mary spent much of her career in nursing primarily in Intensive Care, Organ Recovery and Cardiac Rehabilitation nursing. After earning her Master’s degree, Mary has spent her time providing care as a primary care family nurse practitioner and advanced wound care management including diabetic foot ulcers and hyperbaric wound management.

Mary brings a diverse, holistic quality to the practice. She enjoys living and working in East TN. Mary has many ties to the medical community locally. As a Diabetic Nurse Practitioner with experience in both family practice and diabetic wound care, she is able to
provide her patients with global and inclusive care. Her extensive experience patient care instills trust and confidence in her client population. Patients know that their health evaluation and treatment plan has been thoroughly and globally assessed and executed.


She is married to her husband and they have 3 sons. She enjoys spending time with her family and their 3 dogs: Ziggy, Pippi, and Roy. Her hobbies include running, hiking, reading and cooking. Mary looks forward to meeting you, building a strong relationship and providing you quality health care!


2231 Sand Stone Dr

Morristown, TN 37814


MON - THURS: 8 AM - 6:30 PM



P: (423) 616-0635

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