Oregon Medicaid Expenditures After the 2014 Affordable Care Act Medicaid Expansion: Over-time Differences Among New, Returning, and Continuously Insured Enrollees

Rachel Springer, Miguel Marino, Jean P. O’Malley, Stephan Lindner, Nathalie Huguet, Jennifer Devoe

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Background: There is interest in assessing health care utilization and expenditures among new Medicaid enrollees after the 2014 Medicaid expansion. Recent studies have not differentiated between newly enrolled individuals and those returning after coverage gaps. Objectives: To assess health care expenditures among Medicaid enrollees in the 24 months after Oregon’s 2014 Medicaid expansions and examine whether expenditure patterns were different among the newly, returning, and continuously insured (CI). Research Design: Retrospective cohort study using inverse-propensity weights to adjust for differences between groups. Subjects: Oregon adult Medicaid beneficiaries insured continuously from 2014 to 2015 who were either newly, returning, or CI. Measures: Monthly expenditures for inpatient care, prescription drugs, total outpatient care, and subdivisions of outpatient care: emergency department, dental, mental and behavioral health, primary care, and specialist care. Results: After initial increases, newly and returning insured (RI) outpatient expenditures dropped below CI. Expenditures for emergency department and dental services among the RI remained higher than among the newly insured. Newly insured mental and behavioral health, primary care, and specialist expenditures plateaued higher than RI. Prescription drug expenditures increased over time for all groups, with CI highest and RI lowest. All groups had similar inpatient expenditures over 24 months post-Medicaid expansion. Conclusions: Our findings reveal that outpatient expenditures for new nonpregnant, non–dual-eligible Oregon Medicaid recipients stabilized over time after meeting pent-up demand, and prior insurance history affected the mix of services that individuals received. Policy evaluations should consider expenditures over at least 24 months and should account for enrollees’ prior insurance histories.

Original languageEnglish (US)
JournalMedical Care
DOIs
StateAccepted/In press - Mar 23 2018

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Patient Protection and Affordable Care Act
Medicaid
Health Expenditures
Prescription Drugs
Ambulatory Care
Insurance
Delivery of Health Care
Hospital Emergency Service
Inpatients
Primary Health Care
Tooth
Mental Health
Outpatients
Patient Acceptance of Health Care
Cohort Studies
Research Design

Keywords

  • health insurance
  • medicaid
  • medical expenditures
  • policy evaluation

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health

Cite this

Oregon Medicaid Expenditures After the 2014 Affordable Care Act Medicaid Expansion : Over-time Differences Among New, Returning, and Continuously Insured Enrollees. / Springer, Rachel; Marino, Miguel; O’Malley, Jean P.; Lindner, Stephan; Huguet, Nathalie; Devoe, Jennifer.

In: Medical Care, 23.03.2018.

Research output: Contribution to journalArticle

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abstract = "Background: There is interest in assessing health care utilization and expenditures among new Medicaid enrollees after the 2014 Medicaid expansion. Recent studies have not differentiated between newly enrolled individuals and those returning after coverage gaps. Objectives: To assess health care expenditures among Medicaid enrollees in the 24 months after Oregon’s 2014 Medicaid expansions and examine whether expenditure patterns were different among the newly, returning, and continuously insured (CI). Research Design: Retrospective cohort study using inverse-propensity weights to adjust for differences between groups. Subjects: Oregon adult Medicaid beneficiaries insured continuously from 2014 to 2015 who were either newly, returning, or CI. Measures: Monthly expenditures for inpatient care, prescription drugs, total outpatient care, and subdivisions of outpatient care: emergency department, dental, mental and behavioral health, primary care, and specialist care. Results: After initial increases, newly and returning insured (RI) outpatient expenditures dropped below CI. Expenditures for emergency department and dental services among the RI remained higher than among the newly insured. Newly insured mental and behavioral health, primary care, and specialist expenditures plateaued higher than RI. Prescription drug expenditures increased over time for all groups, with CI highest and RI lowest. All groups had similar inpatient expenditures over 24 months post-Medicaid expansion. Conclusions: Our findings reveal that outpatient expenditures for new nonpregnant, non–dual-eligible Oregon Medicaid recipients stabilized over time after meeting pent-up demand, and prior insurance history affected the mix of services that individuals received. Policy evaluations should consider expenditures over at least 24 months and should account for enrollees’ prior insurance histories.",
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