The Effects of the Transition From Medicaid to Medicare on Health Care Use for Adults With Mental Illness

Background:The transition from Medicaid-only to dual Medicare/Medicaid coverage has the potential to reduce financial barriers to health care for patients with serious mental illness through increased coverage or expanded access to clinicians as their reimbursement increases. Aims:To estimate the effect of dual coverage after Medicaid enrollment during the required waiting period among adults with serious mental illness on health care use, overall and related to mental health and substance use disorders (MHSUD). Methods:Data include enrollment and claims from Medicaid and Medicare in Missouri and South Carolina, from January 2004 to December 2007. We used an interrupted time-series design to estimate the effect of dual coverage on average use of outpatient, emergency department (ED), and inpatient care/month. Results:After 12 months of dual coverage, the probability of outpatient care use increased in both states from 4% to 9%. In Missouri, the mean probability and frequency of ED visits, total and MHSUD related, increased by 21%–32%; the probability of all-cause and MHSUD-related inpatient admissions increased by 10% and 19%, respectively. In South Carolina, the mean probability of any inpatient admission increased by 27% and of any MHSUD-related inpatient admission by 42%. Discussion:The increase in use of outpatient care is consistent with the expected increase in coverage of, and payment for, outpatient services under dual coverage relative to Medicaid-only. Sustained increases in ED and inpatient admissions raise questions regarding the complexity of obtaining care under 2 programs, pent-up demand among beneficiaries pretransition, and the complementarity of outpatient and inpatient service use.

[1]  Mark Duggan,et al.  The Supplemental Security Income (Ssi) Program , 2015 .

[2]  Fang Zhang,et al.  A reanalysis of cluster randomized trials showed interrupted time-series studies were valuable in health system evaluation. , 2015, Journal of clinical epidemiology.

[3]  E. Hing,et al.  Acceptance of new patients with public and private insurance by office-based physicians: United States, 2013. , 2015, NCHS data brief.

[4]  S. Soumerai,et al.  Changes in drug coverage generosity and untreated serious mental illness: transitioning from Medicaid to Medicare Part D. , 2015, JAMA psychiatry.

[5]  G. Riley,et al.  Expenditure Patterns Under the Four Major Public Cash Benefit and Health Insurance Programs for Working-Age Adults With Disabilities , 2014 .

[6]  A. Epstein,et al.  Factors associated with high levels of spending for younger dually eligible beneficiaries with mental disorders. , 2014, Health affairs.

[7]  S. Soumerai,et al.  Effects of Medicare Part D on guideline-concordant pharmacotherapy for bipolar I disorder among dual beneficiaries. , 2014, Psychiatric services.

[8]  Katherine Baicker,et al.  Medicaid Increases Emergency-Department Use: Evidence from Oregon's Health Insurance Experiment , 2014, Science.

[9]  S. Soumerai,et al.  Low-socioeconomic-status enrollees in high-deductible plans reduced high-severity emergency care. , 2013, Health affairs.

[10]  Laura Dague,et al.  Wisconsin experience indicates that expanding public insurance to low-income childless adults has health care impacts. , 2013, Health affairs.

[11]  Richard Williams,et al.  Using the Margins Command to Estimate and Interpret Adjusted Predictions and Marginal Effects , 2012 .

[12]  B. Druss,et al.  Mental Comorbidity and Quality of Diabetes Care Under Medicaid: A 50-state Analysis , 2012, Medical care.

[13]  S. Normand,et al.  Ten-year trends in quality of care and spending for depression: 1996 through 2005. , 2011, Archives of general psychiatry.

[14]  Christine Y. Lu,et al.  Association between prior authorization for medications and health service use by Medicaid patients with bipolar disorder. , 2011, Psychiatric services.

[15]  Alisa B. Busch,et al.  Longitudinal Racial/Ethnic Disparities in Antimanic Medication Use in Bipolar-I Disorder , 2009, Medical care.

[16]  S. Zuckerman,et al.  Trends in Medicaid physician fees, 2003-2008. , 2009, Health affairs.

[17]  Y. Zhang,et al.  Effects of prior authorization on medication discontinuation among Medicaid beneficiaries with bipolar disorder. , 2009, Psychiatric services.

[18]  Alisa B. Busch,et al.  Changes Over Time and Disparities in Schizophrenia Treatment Quality , 2009, Medical care.

[19]  Disability Policy,et al.  Office of Retirement and Disability Policy , 2008 .

[20]  Ellen Meara,et al.  Use of health services by previously uninsured Medicare beneficiaries. , 2007, The New England journal of medicine.

[21]  James Cui,et al.  QIC Program and Model Selection in GEE Analyses , 2007 .

[22]  M. Valenstein,et al.  Effect of a medication copayment increase in veterans with schizophrenia. , 2007, The American journal of managed care.

[23]  Haiden A Huskamp,et al.  Behavioral health insurance parity for federal employees. , 2006, The New England journal of medicine.

[24]  Sandra L. Decker Medicare and the Health of Women with Breast Cancer , 2005, The Journal of Human Resources.

[25]  Janet B. Mitchell,et al.  State Payment Limitations on Medicare Cost-Sharing: Impact on Dually Eligible Beneficiaries , 2004, Inquiry : a journal of medical care organization, provision and financing.

[26]  David Card,et al.  The Impact of Nearly Universal Insurance Coverage on Health Care Utilization: Evidence from Medicare. , 2008, The American economic review.

[27]  Edward C. Chao,et al.  Generalized Estimating Equations , 2003, Technometrics.

[28]  Ellen Meara,et al.  Impact of Medicare coverage on basic clinical services for previously uninsured adults. , 2003, JAMA.

[29]  J. Mccombs,et al.  Cost of treating bipolar disorder in the California Medicaid (Medi-Cal) program. , 2002, Journal of affective disorders.

[30]  A K Wagner,et al.  Segmented regression analysis of interrupted time series studies in medication use research , 2002, Journal of clinical pharmacy and therapeutics.

[31]  S. Soumerai,et al.  Effects of Limiting Medicaid Drug-Reimbursement Benefits on the Use of Psychotropic Agents and Acute Mental Health Services by Patients with Schizophrenia , 1994 .

[32]  S. Normand,et al.  Ten-Year Trends in Quality of Care and Spending for Depression , 2016 .

[33]  P. Davies,et al.  Disability Benefit Coverage and Program Interactions in the Working-Age Population , 2008, Social security bulletin.

[34]  C. Anderson‐Cook,et al.  Experimental and Quasi-Experimental Designs for Generalized Causal Inference:Experimental and Quasi-Experimental Designs for Generalized Causal Inference , 2005 .

[35]  J. Buck,et al.  Mental Health and Substance Abuse Services in Ten State Medicaid Programs , 2004, Administration and Policy in Mental Health and Mental Health Services Research.

[36]  Letty Carpenter Evolution of Medicaid Coverage of Medicare Cost Sharing , 1998, Health care financing review.