Autism Prevalence in the Medicaid Program and Healthcare Utilization and Costs Among Adult Enrollees Diagnosed with Autism.

As the number of individuals diagnosed with autism increases, there is an increase in demand to provide support throughout their lifespan. This study aimed to: (1) estimate trends in the prevalence of autism diagnoses and medical services use in adults with autism diagnoses; (2) assess predictors of healthcare utilization and costs among adults with autism diagnoses enrolled in Medicaid. A retrospective analysis of 2006-2008 Medicaid claims for 39 states was conducted. There was a 38% increase in the prevalence of autism diagnoses from 2006 to 2008. Total expenditures and outpatient and ER visits varied significantly by demographic variables.