Our approach is based on personalized medicine that aims to find and treat the root cause of disease so our patients can return to optimal health and thrive.

Functional medicine efforts focus on the root causes of an individual’s condition and treats those causes. Our philosophy for optimum health is based on our belief that everyone has the potential to achieve wellness. We achieve this through practicing evidence-based medicine, using nutritional interventions, nutraceuticals, and medications when necessary.

In addition to functional medicine offerings, we also provide annual wellness exams, involving the most up to date testing and exams required for disease prevention. For patients who are in-network with us, they are able to select Functional Medicine of Idaho as their primary care provider after they establish themselves as a patient at our clinic.

Functional Medicine of Idaho Matrix

Conditions We Treat

Our team of providers treat a wide variety of chronic health conditions based on the Functional Medicine Matrix above, including but not limited to:

  • Adrenal Fatigue
  • Alzheimer’s / Dementia
  • Ankylosing Spondylitis
  • Anxiety/Depression
  • Asthma
  • Autoimmune disorders
  • Bio-identical Hormone Replacement Therapy
  • Bipolar
  • Blood Sugar Imbalances
  • Brain Fog
  • Cardiovascular Disease
  • Celiac Disease
  • Chronic Pain Syndrome
  • Congestion and intestinal tract optimization
  • Constipation
  • Crohn’s Disease
  • Detoxification
  • Diabetes, Pre-Diabetes and Metabolic Syndrome
  • Diarrhea
  • Dry Eye
  • Eating Disorders
  • Ehlers’ Danlos Syndrome
  • Endometriosis
  • Eosinophilic
  • Esophagitis
  • Fatigue and cognitive disorders
  • Female Hormone Imbalances
  • Fibromyalgia
  • Food Allergies / Intolerances
  • Gastritis & Reflux
  • GERD
  • Gout
  • Guillain Barre Syndrome
  • Hormonal imbalances
  • Hashimoto’s Disease
  • Hypothyroidism
  • Hyperlipidemia
  • Hypertension
  • Hyperthyroidism
  • Hypertriglyceridemia
  • Immune and inflammatory disease modification
  • Inflammatory Bowel Disease
  • Inflammatory Erosive Arthritis
  • Insulin Resistance / Pre-diabetes
  • Irritable Bowel Syndrome
  • Kidney Stones
  • Leaky Gut
  • Low Testosterone & Hypogonadism
  • Lupus
  • Malabsorption
  • Minor surgical procedures
  • Mood disorders
  • Multiple Sclerosis
  • Nutritional bio chemistry assessment
  • OCD
  • Obesity
  • Osteoarthritis
  • Osteoporosis / Osteopenia
  • Pain and inflammation
  • Parasites
  • Polycystic Ovarian Syndrome
  • Post Concussion Syndrome / Traumatic Brain Injury
  • Postpartum Depression
  • Psoriatic Arthritis
  • PTSD
  • Reactive Arthritis
  • Rheumatoid Arthritis
  • SICCA Syndrome
  • Sleep Apnea
  • Ulcerative Colitis
  • Weight Management
  • Yeast / Candida Overgrowth Syndrome

Meet Our Adult Care Team

Dr. David Musnick, MD, IFMCP

Christa Inzer Castillo MSPAS, PA-C, MPH

Karen Callagy

Karen Callagy, PA-C, IFMCP

Amy Ray


Michael Sermon, PA-C

Gavin Guard, PA-C, CISSN

Elizabeth Hingley, NP-C, IFMCP, CDCES

Jennifer Paulson, DNP, FNP-BC, APHN-BC, IFMCP

Janessa Tenney, PA-C, IFMCP