IDD / Autism
Diagnoses, genetics, case examples, resource hub.
Key definitions: ID, DD, Autism, and SU
These four terms are often used interchangeably but mean different things. Click each tile to read a clear, plain-language definition.
Severity is about support, not IQ
ID severity is described by the level of day-to-day support a person needs — not by an IQ score alone. Click each level for what it means in everyday life and in substance-use work.
Common diagnoses across the IDD/A spectrum
Each tile opens a short, clinical-friendly description. These are examples — not a complete diagnostic list.
Genetic causes and risk factors
Genetic factors account for 25–50% of IDD/A cases, and advances in genetic testing now suggest that up to 80% may have identifiable genetic contributions. The examples below are the most frequently encountered in practice.
Meet the people behind the cases
Click any portrait to read the full case and reflect on practice questions with your team.
Find IDD / Autism resources in your state
Click any state on the map for official behavioral-health, developmental-disability, and crisis contacts. National helplines appear alongside every state.
Find state resources
Click a state to see official behavioral-health and developmental-disability contacts.