Predictors of Emergency Room and Hospital Utilization Among Adults With Intellectual and Developmental Disabilities (IDD)

Primary Care Quality Improvement Through Patient-Centered Medical Homes and the Impact on Emergency Department Utilization for Children With Autism and Mental Health Disorders

BACKGROUND AND OBJECTIVES

To address health care spending growth, coordinated care, and patient-centered primary care, most states in the United States have adopted value-based care coordination programs such as patient-centered medical homes (PCMHs). The objective of this study was to understand the relationship between having access to PCMHs and emergency department (ED) utilization for high cost/need children with autism and children with mental health disorders (MHDs).

METHODS

This cross-sectional study included 87 723 children between ages 3 and 17 years in the 2016-2018 National Survey for Children's Health. Multivariate-adjusted logistic regression analyses were used to assess the association between ED and PCMH utilization for children with autism, with MHDs without autism, and others without autism or MHDs. Marginal predictions were used to examine whether PCMH utilization was moderated by health conditions.

RESULTS

The results showed that children with a PCMH had a 16% reduction in the odds to visit the ED (adjusted odds ratio [aOR] = 0.84; confidence interval [CI], 0.77-0.92; P < .001). When compared with the reference group of children without autism and without MHDs, children with MHDs but without autism had 93% higher odds to visit the ED (aOR = 1.93; CI, 1.75-2.13; P < .001) and children with autism had 35% higher odds to visit the ED (aOR = 1.35; CI, 1.04-1.75; P = .023). Marginal effects results suggested that PCMHs reduced the odds of ED visits the most for children with MHDs without autism and reduced the predicted ED visits from 30.1% to 23.7% ( P < .001).

CONCLUSIONS

Primary care quality improvement through access to a PCMH reduced ED visits for children, but the effect varied by autism and MHD conditions. Future PCMH efforts should continue to support children with autism and address unmet needs for children with MHDs with a focus on needed care coordination, family-centered care, and referrals.

A qualitative analysis of expert interviews on safety and risk

Safety is a significant clinical challenge in settings serving adults with developmental disabilities. Few resources exist to guide clinical teams in this realm; this study explored safety elements through interviews with experts in critical areas of safety management. The present study aimed to gather knowledge and insights regarding assessing risk among individuals with disabilities. Due to gaps in the available safety literature in adult services, interviews in related areas were conducted and analyzed for thematic content. This paper focuses on the extracted safety themes' categorization, summarization, and implications. The safety themes extracted from the interviews included environmental arrangements, medical, independent living skills, historical indicators of risk, family life skills, challenging behavior, and communication. The interviews identified areas of concern that might guide assessment and inform providers about the most individually relevant contexts to consider when supporting clients.

Health care transition quadruple aim outcomes for IDD: Scoping review

Purpose

Structured HCT models addressing planning, transfer, and integration into adult care for adolescents and young adults with childhood-acquired chronic conditions are becoming more prevalent. However, consensus on outcome measures to assess health care transition (HCT) interventions particularly for intellectual and developmental disabilities (IDD) population is lacking. This scoping review identified potential HCT outcome measures for young adults (aged 18-26) with IDD using the Quadruple Aim Framework.

Methods

On August 6, 2021 and April 27, 2023, Medline Ovid, Embase, Web of Science, PsycINFO, and Cochrane databases were searched using the terms "young adult," "intellectual disability," "developmental disability, "cognitive dysfunction," "autism," "cerebral palsy," "spina bifida," and "transition to adult care." Searches were limited to publications in English and published from 2000 to present. Observational and experimental (qualitative or quantitative) studies were included if participants were young adults (median/mean ages 18-26) with IDD (Autism, cerebral palsy, Down syndrome, spina bifida, or other IDD-related conditions) and study outcomes addressed one of the Quadruple Aim domains (population health, patient/family experience, cost/utilization, and healthcare provider/caregiver experience). Studies were excluded if participants had attention deficit/hyperactivity disorder or learning disability only, if outcomes were primarily educational or vocational, or if publications were reviews, abstracts, or not in English.

Results

One hundred and three articles were included data extraction. Articles were categorized under the Quadruple Aim domains: Population Health (43), Patient/Caregiver Healthcare Experience included (23), Cost/Utilization (24), and Healthcare Provider/Caregiver Experience (15). Most articles were observational and utilized a variety of assessments or internally developed questions as measures.

Conclusions

While studies describing HCT outcomes for the IDD population are limited and measures are inconsistent, studies pertaining to Quadruple Aim outcomes identified in this review can further direct efforts towards consensus and standardization of HCT outcome measures to address the needs of individuals with IDD, their families, and caregivers/providers.

Understanding Characteristics and Predictors of Admission From the Emergency Department for Patients With Intellectual Disability

The goal of this investigation is to compare rates of admission from the emergency department (ED) and the characteristics of patients with intellectual disability (ID) who get admitted from the ED. This was a retrospective study using data from the United States' Nationwide Emergency Data Sample (NEDS) to investigate the associations between the diagnosis of ID and admission to the hospital in patients ≥ 18 years during the years 2016-2017. Adults with ID were almost four times as likely to be admitted to the hospital from the ED as patients who were not identified as having ID. Identifying the major contributors to increased admission for patients with ID may help improve their care.

Emergency Medical Care of People with Intellectual Disabilities: A Scoping Review

Purpose

The paper intends to do a scoping review of people with intellectual disabilities in emergency care where this group seems to face access barriers and discrimination. It analyses the conceptual and methodological framework for studies examining the former.

Methods

A scoping review is conducted. The studies' quality is assessed via a checklist developed by the authors drawing on a compilation of common assessment tools for study quality.

Results

Fourteen quantitative studies fulfil the inclusion criteria for further analysis. Summary measures are extracted. Results are synthesized with Andersen's Behavioral Model of Health Service Use. Studies employ a combination of variables attributable to different aspects of population characteristics and health behavior.

Conclusion

Most studies seek to quantify or predict emergency care overuse by people with intellectual disabilities. Future studies should also take patients' poor health or treatment outcomes and their perspectives into account.

Barriers and Facilitators to Healthcare Access in Adults with Intellectual and Developmental Disorders and Communication Difficulties: an Integrative Review

This integrative review explores the barriers to and facilitators of healthcare access in adults with intellectual and developmental disorders (IDD) and communication difficulties (CD) using Levesque et al.'s conceptual framework of access to health. IDDs are a group of disorders that occur early in childhood and often involve language dysfunction. CDs are prevalent in adults with IDD. Several themes emerged as barriers to access for adults with IDDs and CDs including health literacy, understanding health information, and screening; fear and negative patient expectations; impaired autonomy; time; accommodation needs; insurance coverage and financial hardship; communication; coordination and continuity of care; and supporter presence and inclusion. Communication between providers, patients, and supporters is a significant barrier for adults with IDD and CD.

Supplementary Information

The online version contains supplementary material available at 10.1007/s40489-022-00324-8.

Factors associated with use of medication for behavioral challenges in adults with intellectual and developmental disability

BACKGROUND/AIMS

Persons with intellectual or developmental disabilities and who exhibit challenging behaviors are often prescribed medication to control behavior. Little is known about the environmental factors that may be associated with taking these medications.

METHODS AND OUTCOMES

This study examined the association between individual and intermediate or environmental factors and the documented use of medication for clients with intellectual or developmental disabilities (IDD) who exhibit challenging behavior, using the 2014-15 National Core Indicators Adult Consumer Survey dataset.

RESULTS AND CONCLUSIONS

Individual-level variables associated with a higher likelihood of taking medication for persons with IDD exhibiting challenging behaviors included being of younger age, male gender, having moderate or severe intellectual disability, being ambulatory, communicating verbally, having a behavioral plan, requiring support for behavioral challenges, and having a history of mental illness. Environment-level variables included infrequently eating out and having less everyday choice. This study found that restrictions in opportunities to make choices in their life was associated with a greater likelihood of being on a medication for persons with IDD who exhibit challenging behavior. Living in group home settings also increased the likelihood of medication use. A limitation of the study is a lack of information on why medications were prescribed and whether they were intended to treat the challenging behavior.

IMPLICATIONS

This work has important implications for health providers, as addressing malleable social factors may provide an avenue for reducing challenging behaviors without the need for medication.

Determinants of hospital-based health service utilisation in cerebral palsy: a systematic review

OBJECTIVE

To systematically review and synthesize evidence of determinants associated with hospital-based health service utilisation among individuals with cerebral palsy (CP).

DATA SOURCES

Electronic databases MEDLINE, Embase, APA Psycinfo were searched from January 2000 to April 2020.

STUDY SELECTION

Observational studies were included that described people with CP, reported quantitative measures of hospital-based health service utilisation (inpatient, outpatient, emergency department), and based in high-income countries. We excluded studies that included only subsets of people with CP, or those that only reported therapy service utilisation.

DATA EXTRACTION

After initial screen, two reviewers reviewed full texts for inclusion and performed data extraction and risk of bias assessment using the Newcastle Ottawa scale. Determinants of health service utilisation were identified and categorised using the Andersen Behavioural Model.

DATA SYNTHESIS

Seventeen studies met inclusion criteria. Study quality was high. Twenty-six determinants were reported across eight Andersen Model characteristics. Individual predisposing factors such as sex showed no difference in health service utilisation; inpatient admissions decreased with increasing age during childhood and was lower in adults. Increased health service utilisation was associated with "individual need" including severe gross motor disability, epilepsy, developmental/ intellectual disability and gastrostomy-use across inpatient, outpatient and emergency department settings. There was little information reported on socio-demographic and health system contextual determinants.

CONCLUSIONS

CP health service utilisation was associated with age, severity and comorbidities. Improved understanding of determinants of health service utilisation can support health service access for people with CP.

Psychotropic Use Among Youths With Intellectual and Developmental Disabilities

OBJECTIVE

The authors examined the prevalence and correlates of psychotropic medication prescribing among outpatient youths with intellectual and developmental disabilities.

METHODS

The authors reviewed cross-sectional data on medications for 1,333 youths (ages 5-21 years) with intellectual and developmental disabilities who were referred to a community-based mental health crisis service. Descriptive statistics and regression analysis were used to describe the study group and to identify correlates of psychotropic polypharmacy, antipsychotic use, and anticonvulsant use in the absence of a seizure disorder.

RESULTS

Most youths were taking psychotropic medications (N=1,139, 86%), often three or more medications (N=733, 55%) from two or more drug classes (N=919, 69%). Most youths received antipsychotics (N=863, 65%), and a third (N=432, 32%) were taking anticonvulsants in the absence of a seizure disorder. Greater severity (number of psychiatric diagnoses and recent psychiatric hospitalization), older age, and living in a group home were significantly correlated with these practices.

CONCLUSIONS

Polypharmacy, antipsychotic use, and anticonvulsant use in the absence of seizure disorders were common among youths with intellectual and developmental disabilities referred to the crisis service. Older age, number of psychiatric diagnoses, living in a group home, and psychiatric hospitalization correlate with these prescribing practices. These elevated prescribing rates in a very vulnerable population warrant further study.

Consultation Needs for Young Adults with Intellectual and Developmental Disabilities Admitted to an Adult Tertiary Care Hospital: Implications for Inpatient Practice

BACKGROUND

Children with intellectual and developmental disabilities (IDD), particularly those with medical complexity, account for a large proportion of pediatric inpatients and are increasingly surviving to adulthood. However, few studies have evaluated the inpatient care of this population after transition to adult hospitals. This paper describes a Med-Peds Hospitalist service providing inpatient consultation for young adults with childhood conditions and offers a window into issues likely to be faced by young adults with IDD as they face increased admissions to adult hospitals.

METHODS

A single center retrospective chart review was performed of adults with intellectual and developmental disabilities referred to the Med-Peds consult service at a large urban adult academic medical center.

FINDINGS

The most common medical recommendations provided focused on diagnosis and management of gastrointestinal, neurologic, and respiratory issues. Coordination between pediatric and adult caregivers, disposition planning, communication and family support, and guidance on weight-based dosing were also commonly provided services.

DISCUSSION

Young adults with IDD face new challenges when admitted to adult hospitals. In this single-center study, several areas were identified where expert consultation could be helpful. The need for structured coordination of care for this vulnerable patient population was highlighted. Knowledgeable consultative services may be an effective intervention to address the unique needs of hospitalized young adults with IDD.

APPLICATION TO PRACTICE

Hospitals should consider structured inpatient programs, care-paths, or consultation from providers knowledgeable in the care of young adults with intellectual disabilities in order to improve the inpatient care of this population.

Value-Based Payments: Intellectual and Developmental Disabilities Quality Indicators Associated With Billing Expenditures

Although managed care is expanding into the intellectual and developmental disabilities (IDD) service system, there is little agreement about measurable and meaningful outcomes for people with IDD, including for use in value-based payments (VBP). In this study, we examined potential VBP metrics for people with IDD-relationships between quality and costs. We analyzed Basic Assurances data and long-term services and supports billing data from 68 human service organizations that supported 6,608 people with IDD. Our final hierarchical regression model predicted 66.40% of the variance of annual long-term services and supports (LTSS) billing per person. Our findings suggest quality assurance indicators can account for a significant portion of cost variance-quality metrics represent a potential for cost savings and efficient service delivery.

Evidence to Inform Occupational Therapy Intervention With Adults With Intellectual Disability: A Scoping Review

IMPORTANCE

Occupational therapy practitioners use a range of habilitative and compensatory approaches to teach new skills or modify tasks and environments to address occupational performance among adults with intellectual disability (ID); therefore, they must identify and use available evidence to guide intervention planning.

OBJECTIVE

To summarize the scope of evidence that can inform occupational therapy intervention with adults with primary or comorbid ID.

DATA SOURCES

Articles published in peer-reviewed journals between January 2002 and January 2018 and indexed in PubMed, CINAHL, PsycINFO, and Scopus. Study Selection and Data Collection: A total of 159 articles met inclusion criteria and contained information on occupational therapy intervention with adults ages 18 yr or older with primary or coexisting ID.

FINDINGS

Fifty-seven of the 159 articles focused on intervention to address occupational performance outcomes (i.e., employment, self-care, leisure and social interaction, community participation).

CONCLUSIONS AND RELEVANCE

A wide range of literature is available to support occupational therapy intervention with adults with ID. Occupational therapy practitioners may be less knowledgeable about this evidence because much of it is located in non-occupational therapy or international journals. What This Article Adds: This scoping review provides occupational therapy practitioners with evidence to support high-quality occupational therapy intervention with adults with ID.

Managed Care and Value-Based Payment: The Relationship Between Quality of Life Outcomes and Emergency Room Utilization

Although Medicaid managed care is a growing service model, there is a limited evidence base regarding quality and value-based payment standards for people with intellectual and developmental disabilities (IDD). This study examined the relationship between emergency room utilization and quality of life outcomes. We analyzed secondary Personal Outcome Measures quality of life and emergency room utilization data from 251 people with IDD. According to our findings, people with IDD with continuity and security in their lives and/or who participated in the life of the community had fewer emergency room visits, regardless of their impairment severity or dual diagnosis status. As such, the number of emergency room visits needed, and the potential expenditures associated, may be reduced by focusing on quality outcomes.

The Impact of Home and Community Based Settings (HCBS) Final Settings Rule Outcomes on Health and Safety

Despite physically relocating into the community, many people with intellectual and developmental disabilities (IDD) fail to be meaningfully included in the community. The Home and Community Based Services (HCBS) Settings Rule was introduced to expand community integration, person-centered services, and choice. The aim of this exploratory study is to examine the potential impact of HCBS Settings Rule implementation, specifically by examining how the presence of HCBS Settings Rule outcomes impact three areas of health and safety. We analyzed secondary Personal Outcome Measures data relating to the HCBS Settings Rule, and emergency room visits, abuse and neglect, and injuries data from 251 people with IDD. Findings indicate a clear need to improve HCBS Settings Rule related areas of people's lives.

The Medicaid expansion did not crowd out access for medicaid recipients with disabilities in Oregon

BACKGROUND

The Affordable Care Act (ACA) substantially increased the number of Medicaid enrollees, which could have reduced access to health care services for those already on Medicaid before the expansion.

OBJECTIVE

To examine the association of the ACA expansion on health care access and utilization for adults ages 18-64 years who have qualified for Supplemental Security Income (SSI) in Oregon.

METHODS

We used Oregon Medicaid claims and enrollment data from 2012 to 2015 and information from the American Community Survey and the Local Area Unemployment Statistics. Multivariate regressions compared changes in health care access and utilization before and after the expansion among Medicaid recipients who qualified for SSI across counties in Oregon with higher and lower Medicaid enrollment increases due to the expansion. Health care access and utilization outcome measures included: primary care visits, non-behavioral health outpatient visits, behavioral health outpatient visits, emergency department (ED) visits and potentially avoidable ED visits.

RESULTS

The Medicaid expansion led to an uneven increase in Medicaid enrollment across Oregon's counties (mean increase from the first quarter of 2012 to the third quarter of 2015: 12.4% points; range: 7.3 to 18.6% points). Access and utilization outcomes for SSI Medicaid recipients were mostly unaffected by differential enrollment increases. ED visits increased more in counties with a larger Medicaid enrollment increase (estimate: 1.8, p < 0.05), but adjusting for pre-expansion trends eliminated this association.

CONCLUSIONS

We did not find evidence that an increase in Medicaid enrollment due to the ACA negatively impacted access and utilization for adult Medicaid recipients on SSI, who were eligible for Medicaid prior to expansion.

Health inequities in unscheduled healthcare for children with intellectual disabilities in Ireland: a study protocol

Background: Health inequities for children with intellectual disabilities  are prevalent within different health systems, and children with intellectual disabilites  have shorter life expectancies than the general population, higher mortality rates before the age of 17 and have a greater risk of potentially preventable hospitalisations. A health systems approach to research in this area provides a useful means through which research can inform policy and practice to ensure people with intellectual disabilities receive equitable healthcare; however, there is a paucity of evidence regarding how to address differences that have been described in the literature to date. The overall aim of this research is to establish the extent of health inequities for children with intellectual disabilities  in Ireland compared to children without intellectual disabilities with respect to their utilisation of primary care and rates of hospitalisation, and to gain a better understanding of what influences utilisation of primary care and emergency department services in this population. Methods and analysis: The design of this research adopts a multi-methods approach: statistical analysis of health data to determine the extent of health inequities in relation to healthcare utilisation; discrete choice experiments to explore General Practitioners' decision making and parental preferences for optimal care; and concept mapping to develop consensus between stakeholders on how to address current healthcare inequities. Discussion: By applying a systems lens to the issue of health inequities for children with intellectual disabilities, the research hopes to gain a thorough understanding of the varying components that can contribute to the maintenance of such healthcare inequities. A key output from the research will be a set of feasible solutions and interventions that can address health inequities for this population.

Social determinants of health, emergency department utilization, and people with intellectual and developmental disabilities

BACKGROUND

People with intellectual and developmental disabilities' (IDD's) health is largely dependent on the government services they receive. Medicaid managed care has emerged as one mechanism used to provide services to people with disabilities in an attempt to reduce costs. In managed care, there has been an emphasis on reducing emergency department visits and hospital admissions in an effort to reduce expenditures.

OBJECTIVE

The purpose of this exploratory study was to examine the impact social determinants of health -"conditions in the environments in which people are born, live, learn, work, play, worship, and age that affect a wide range of health, functioning, and quality-of-life outcomes and risks" (n.p.)¹ - had on the emergency department utilization of people with IDD.

METHODS

We had the following research question: what is the relationship between social determinants and emergency department utilization (visits) among adults with IDD? To explore this research question, a negative binomial regression analysis was used with secondary social determinant outcomes data (from Personal Outcome Measures®) and emergency department visit data from a random sample of 251 people with IDD. We also examined relationships with participants' demographics.

RESULTS

Our findings revealed for every one unit increase in the number of social determinant outcomes present, there was a 7.97% decrease in emergency department visits. There were also significant relationships between emergency department visits, and complex support needs, intellectual disability level, primary communication method, and residence type.

CONCLUSIONS

Social determinants are critical to promote the quality of life and health equity of people with IDD.

Incidence Rate of Advanced Chronic Kidney Disease Among Privately Insured Adults with Neurodevelopmental Disabilities

Purpose

Due to complex medical profiles, adults with neurodevelopmental disabilities (NDDs) may have a heightened risk for early development of chronic kidney disease (CKD) and accelerated CKD progression to advanced stages and kidney failure. The purpose of this study was to estimate the incidence rate of advanced CKD for adults with NDDs and compare the incidence rate to adults without NDDs.

Patients and Methods

Data were used from the Optum Clinformatics^® Data Mart to conduct this retrospective cohort study. The calendar year 2013 was used to identify eligible participants: individuals ≥18 years of age and without advanced CKD. Participants were followed from 01/01/2014 to advanced CKD, loss to follow-up, death, or end of the study period (12/31/2017), whichever came first. Diagnostic, procedure, and diagnosis-related group codes identified NDDs (intellectual disabilities, cerebral palsy, autism spectrum disorders), incident cases of advanced CKD (CKD stages 4+), diabetes, cardiovascular diseases, and hypertension present in the year 2013. Crude incidence rates (IR) of advanced CKD and IR ratios (IRR), comparing adults with vs without NDDs (with 95% CI) were estimated. Then, Cox regression estimated the hazard ratio (HR and 95% CI) for advanced CKD, comparing adults with NDDs to adults without NDDs while adjusting for covariates.

Results

Adults with NDDs (n=33,561) had greater crude IR of advanced CKD (IRR=1.32; 95% CI=1.24–1.42) compared to adults without NDDs (n=6.5M). The elevated rate of advanced CKD among adults with NDDs increased after adjusting for demographics (HR=2.19; 95% CI=2.04–2.34) and remained elevated with further adjustment for hypertension and diabetes (HR=2.01; 95% CI=1.87–2.15) plus cardiovascular disease (HR=1.84; 95% CI=1.72–1.97). Stratified analyses showed that the risk of advanced CKD was greater for all NDD subgroups.

Conclusion

Study findings suggest that adults with NDDs have a greater risk of advanced CKD than do adults without NDDs, and that difference is not explained by covariates used in our analysis.

Health inequities in unscheduled healthcare for children with intellectual disabilities in Ireland: a study protocol

Background: Health inequities for children with intellectual disabilities (ID) are prevalent within different health systems, and children with ID have shorter life expectancies than the general population, higher mortality rates before the age of 17 and have a greater risk of potentially preventable hospitalisations. A health systems approach to research in this area provides a useful means through which research can inform policy and practice to ensure people with ID receive equitable healthcare; however, there is a paucity of evidence regarding how to address differences that have been described in the literature to date. The overall aim of this research is to establish the extent of health inequities for children with ID in Ireland compared to children without ID with respect to their utilisation of primary care and rates of hospitalisation, and to gain a better understanding of what influences utilisation of primary care and ED services in this population. Methods and analysis: The design of this research adopts a mixed-methods approach: statistical analysis of health data to determine the extent of health inequities in relation to healthcare utilisation; discrete choice experiments to explore General Practitioners' decision making and parental preferences for optimal care; and concept mapping to develop consensus between stakeholders on how to address current healthcare inequities. Discussion: By applying a systems lens to the issue of health inequities for children with ID, the research hopes to gain a thorough understanding of the varying components that can contribute to the maintenance of such healthcare inequities. A key output from the research will be a set of feasible solutions and interventions that can address health inequities for this population.

Health Care Use and Spending of Pediatric Patients With an Intellectual or Developmental Disability

BACKGROUND

Health care costs and utilization for those with an intellectual or developmental disability (IDD) have been shown to be higher than the general population.

OBJECTIVE

To investigate the services that contribute to higher costs and utilization among noninstitutionalized children with an IDD.

DESIGN

Matched case-control secondary analysis of the 2000-2017 Medical Expenditure Panel Survey. Pediatric (age 0-21) patients with an IDD were matched to non-IDD subjects. Health care utilization and costs were evaluated with zero-inflated negative binomial regressions and generalized linear models, respectively.

MEASURES

Outcome measures included high-acuity health care utilization [ie, emergency department (ED) visits and hospital admissions], and cost outcomes for total spending, ED use, hospitalization, medications, office visits, home health, and physical therapy.

RESULTS

There was no statistical difference in utilization of EDs among the 2 groups though subjects with an IDD showed more hospitalizations than their matched cohort (incidence rate ratios=1.63, P=0.00). Total health care spending was higher among patients with an IDD (coefficient=$5831, P=0.00). Pediatric spending was higher in all measures except for ED. The biggest discrepancies in spending were seen in home health (coefficient=$2558, P=0.00) and outpatient visits (coefficient=$1180, P=0.00).

CONCLUSIONS

Pediatric patients with an IDD had higher health care spending and utilization than non-IDD subjects in all categories except for ED use.

The Impact of Medicaid Managed Care on Health Service Utilization Among Adults With Intellectual and Developmental Disabilities

People with intellectual and developmental disabilities (IDD) are frequent users of health services. We examined how their service utilization of emergency department (ED), inpatient hospitalization, and primary care physicians changed as they transitioned from fee-for-service to Medicaid managed care (MMC). Our results showed that MMC reduced the utilization of all of these services. A substantial decrease in ED visits was associated with the reduction in visits due to mental/behavioral health conditions and conditions that could be nonemergent and manageable with the community-based health services. These findings suggest that health service utilization of people with IDD is related not only to their health needs, but also to the delivery model that provides their health services.