Table 1. Weighted Percentages of Medicare Beneficiaries With Exclusive Annual Enrollment in Medicare Advantage (MA) by Disability Entitlement, 2015-2018.
| Variable | Disability entitlement | No disability entitlement | % (95% CI) | |
|---|---|---|---|---|
| Unadjusted difference | Market-adjusted differencea | |||
| Total unweighted patient-years, No.b | 8716 | 43 871 | NA | NA |
| Exclusive MA enrollment among all beneficiaries, % | 34.8 | 41.2 | –6.4 (–9.0 to –3.8) | –6.7 (–9.1 to –4.3) |
| SNP enrollment among MA beneficiariesc | ||||
| SNP (as % of MA beneficiaries)d | 28.1 | 8.7 | 19.4 (15.3 to 23.4) | 13.0 (10.0 to 16.1) |
| Non-SNP (as % of MA beneficiaries) | 71.9 | 91.3 | NA | NA |
Abbreviations: NA, not applicable; SNP, special needs plan.
We adjusted for county-level MA market penetration rate (proportion of Medicare beneficiaries in the beneficiary's county enrolled in MA) and state fixed effects to adjust for state policy differences and state differences in supply of medical services, clinician practice intensity, and coding intensity. We included year fixed effects to adjust for secular trend.
Medicare beneficiaries living in the community with at least 1 month of enrollment in Part A and B benefits. Unweighted sample sizes are reported. Estimates from the 2015-2018 Medicare Current Beneficiary Survey were weighted to be nationally representative using cross-sectional weights accounting for the overall annual selection probability of each person sampled and including adjustments for the stratified sampling design, survey nonresponse, and coverage error.
Sampling MA beneficiaries with an available MA plan and contract identification numbers in the Medicare Current Beneficiary Survey linked to public data on MA special needs plans published annually by the Centers for Medicare & Medicaid Services at the plan and contract level (n = 2368 of 2732 for beneficiaries with disability entitlement and n = 16 408 of 18 412 for beneficiaries without disability entitlement).
SNPs for chronic and disabling conditions, dually enrolled Medicare-Medicaid beneficiaries, and beneficiaries institutionalized in long-term care.