Association of Managed Medicaid Plans and Cancer Stage at Diagnosis

Abstract

Managed care organizations provide insurance to many Medicare (Advantage) and Medicaid beneficiaries and seek to maintain quality while controlling provider networks, utilization, and costs. In prior research, patients with Medicare Advantage plans had restricted access to care, including at cancer centers, and had higher mortality after cancer surgery than patients with traditional Medicare. Over 80% of Medicaid patients nationally are enrolled in managed care plans; despite their prevalence, there is a paucity of evidence regarding the quality of cancer care provided by these plans. We examined associations of state-level managed Medicaid rates and cancer stage at diagnosis. Adults ages 18-64 years with Medicaid coverage diagnosed with cancer from 2007-2016 were identified from Surveillance, Epidemiology, and End Results program data covering 12 states. Note that 2016 was the last year with unsuppressed insurance status data. Year-varying state-level rates of types of managed Medicaid plans (comprehensive risk-based managed care, limited benefit plans, and primary care case management) were obtained from the Medicaid and CHIP Payment and Access Commission and categorized in quartiles. The association of state levels of each type of managed Medicaid plan with localized stage diagnoses was evaluated using multivariable linear probability models with cluster-robust standard errors (state clusters) accounting for state fixed effects, year fixed effects, age, sex, race, metropolitan residence, marital status, county-level income and education, state Medicaid expansion status, and cancer type. A total of 229,227 Medicaid patients were identified. The average state-level rates of comprehensive managed care, limited benefit, and primary care case management plans were 47%, 47%, and 5.6%, respectively. In adjusted analyses, relative to states with <20% of Medicaid recipients enrolled in comprehensive managed care plans, states with 40-80% (-2.07 percentage points, 95% CI = -3.31 to -0.83, P = .001) and >80% (-1.49, 95% CI = -2.49 to -0.50, P = .003) had fewer localized stage diagnoses. States with >2% relative to 0-1% of recipients enrolled in primary care case management plans had more localized stage diagnoses (1.02, 95% CI = 0.27 to 1.77, P = .008). States with higher levels of limited benefit plans had more localized stage diagnoses (P = .011), though associations were attenuated with increasing levels (20-40%: 1.22; 40-80%: 0.53; >80%: 0.40). Patterns were similar across most cancer types. The prevalence and type of Medicaid managed care plans are associated with early-stage cancer diagnoses. Higher levels of comprehensive managed care plans were associated with fewer early diagnoses, raising concerns about barriers to symptom evaluation and diagnostic workup. In contrast, higher levels of primary care case management plans were associated with more early diagnoses, potentially through streamlined care coordination.