A note for our existing patients

If you saw Dr. Duis between September 1, 2024 and September 30, 2026, you are an established patient, and you can keep Dr. Duis as your physician.
Established patients will be offered membership in our new concierge practice on special terms. You don’t need to do anything until you hear from us.

We are no longer accepting new patients through insurance. All new patients join through the concierge practice.

About concierge care

Existing patients · Education

Learn about rare conditions

Plain-language overviews of conditions we care for, written for patients and families.

Featured

Ehlers-Danlos Syndrome (EDS)

Ehlers-Danlos syndrome (EDS) is a group of inherited connective tissue disorders that affect collagen — the protein that provides structure and support to skin, joints, blood vessels, and internal organs.

Kabuki Syndrome

Kabuki syndrome is a rare genetic condition that affects multiple body systems. It is commonly associated with distinctive facial features, developmental delay, and congenital anomalies.

Pitt-Hopkins Syndrome

Pitt-Hopkins syndrome is a rare genetic disorder caused by changes in the TCF4 gene. It affects neurodevelopment and can impact breathing patterns, mobility, communication, and cognition.

Prader-Willi Syndrome

Prader-Willi syndrome is a complex genetic condition affecting metabolism, growth, appetite regulation, cognition, and behavior. It is caused by abnormalities involving chromosome 15.

Angelman Syndrome

Angelman syndrome is a rare genetic neurodevelopmental disorder that affects the nervous system. It is typically characterized by developmental delay, minimal or absent speech, difficulty with coordination and balance (ataxia), seizures, and a uniquely joyful and social personality.

Mast Cell Activation Syndrome (MCAS)

Mast cell activation syndrome (MCAS) is a condition in which mast cells — a type of immune cell — release excessive or inappropriate chemical mediators, leading to widespread inflammatory symptoms.