About
Dr. Scott Sieberg has practiced primary care medicine for over 25 years. He grew up in central and southern Illinois, attending Kaskaskia College before transferring to Southern Illinois University in Carbondale. He completed medical school at SIU in Springfield, then finished his family medicine residency through SIU in Decatur.
Dr. Sieberg spent years practicing in varied settings, including working for other physicians, for a hospital, and running his own practice. For two and a half years, he ran a mobile practice and made only house calls. In 2017, he earned certification through the Institute for Functional Medicine. He also holds certification as a practitioner of the Dr. Dale Bredesen Protocol for Alzheimer's prevention and treatment. Dr. Sieberg takes a science-based approach to functional medicine, focusing on root causes rather than symptom management. He is passionate about nutrition, sleep, exercise, and stress management as tools alongside prescriptions. He currently resides in Decatur and practices in Effingham, where he is a member of Southside Baptist Church.
Education & Training
Undergraduate
Kaskaskia College; Southern Illinois University, Carbondale
Medical School
Southern Illinois University School of Medicine, Springfield
Residency
Family Medicine, Southern Illinois University, Decatur
Additional Training
Certification, Institute for Functional Medicine (2017); Certified Practitioner, Dr. Dale Bredesen Protocol (Alzheimer's prevention and treatment)
Certifications
Conditions Treated
Who is Dr. Sieberg right for?
Dr. Sieberg works well with adults managing chronic conditions such as diabetes, hypertension, thyroid disorders, and autoimmune disease. Patients dealing with fatigue, brain fog, gut issues, or hormone dysregulation benefit from his functional medicine approach. He is a strong fit for anyone seeking root-cause analysis alongside conventional treatment. Families with children also find a home at Cornerstone DPC, as the practice serves patients from newborn through adulthood. Patients interested in Alzheimer's prevention or long-haul Covid treatment have specific protocols available through Dr. Sieberg.
Frequently Asked Questions
Dr. Sieberg treats a wide range of conditions including diabetes, hypertension, elevated cholesterol, thyroid disorders, adrenal disorders, digestive disorders, leaky gut, fatty liver, depression, fatigue, and brain fog. He also provides care for acute Covid-19 infection and long-haul Covid syndrome. His functional medicine training adds depth to his work with autoimmune conditions and chronic inflammation.
Dr. Sieberg holds certification from the Institute for Functional Medicine, which he earned in 2017. He also holds certification as a practitioner of the Dr. Dale Bredesen Protocol for the prevention and treatment of Alzheimer's disease. His primary training is in family medicine through Southern Illinois University.
Dr. Sieberg looks for root causes rather than focusing solely on symptom relief. He combines evidence-based prescribing with lifestyle modifications covering diet, sleep, exercise, stress management, and relationships. He uses peer-reviewed research and functional medicine principles to guide individualized treatment plans.
Yes. Dr. Sieberg received specialized training in the care and treatment of long-haul Covid syndrome. He applies FLCCC Alliance-based protocols to address the persistent symptoms that follow acute Covid-19 infection, including fatigue, brain fog, depression, and breathing difficulties.
Dr. Sieberg gives enrolled patients access to Fullscript, an online supplement platform sourced directly from manufacturers. He passes the maximum discount to patients and does not profit from supplement purchases. He considers nutrition and supplementation a meaningful part of healthcare.
Dr. Sieberg completed his undergraduate education at Kaskaskia College and Southern Illinois University Carbondale. He earned his medical degree from SIU School of Medicine in Springfield and completed his family medicine residency through SIU in Decatur.
Yes. Dr. Sieberg holds certification as a practitioner of the Dr. Dale Bredesen Protocol, which addresses the prevention and treatment of Alzheimer's disease. This certification complements his functional medicine approach and his focus on neurological and cognitive health.
Yes. Dr. Sieberg offers individual functional medicine appointments outside the monthly membership. A first visit of 60 minutes costs $250, with additional 30-minute increments at $75 each. Follow-up visits run $150 for the first 60 minutes, with additional time at $50 per 30 minutes.
Doctor profile last updated April 11, 2026