Medicare Enrollees in Part D, 2006 - 2013

Description: The number and proportion of Medicare beneficiaries who have elected to purchase the Medicare Part D drug benefit has increased since the inception of the benefit in 2006. Enrollees may choose either a stand-alone prescription drug plan (PDP) or a managed care plan (i.e., Medicare Advantage [MA]), which includes wrap around medical coverage. MA coverage is not fee-for-service (FFS), which means that the Medicare A and B claims are not observable for this subgroup.

Technical Notes: Medicare Part D coverage includes anyone with one month or more of Part D during the year. Fee-for-service (FFS) Medicare coverage = 11 or 12 months during the year with Medicare Part A or B coverage, but without HMO any of the months.

Chart Date: April 25, 2015

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Medicare Enrollees in Part D, by Age Group 2013

Description: The 65-74 year old age group comprises the largest group enrolled in Medicare Part D. The number and proportion of Medicare beneficiaries who have elected to purchase the Medicare Part D drug benefit varies by age of the beneficiary. Approximately 75 percent of beneficiaries younger than 65 years of age were enrolled in Part D in 2013, compared to 64.4% of beneficiaries in the 65-74 year age group and approximately 70% of beneficiaries in the two older age groupings.

Technical Notes: Medicare Part D coverage includes anyone with one month or more of Part D during the year. Age is calculated based on age at the end of the calendar year.

Chart Date: April 25, 2015

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Proportion of Medicare Enrollees in Part D, 2013

Description: The proportion of Medicare beneficiaries enrolled in Part D varies by state. There were a total of 55.3 million beneficiaries in 2013 and 68.45% overall were enrolled in Part D. Alaska had the smallest proportion of Medicare beneficiaries enrolled in Part D (40.3%) and California had the largest (75%).

Technical Notes: Medicare Part D coverage includes anyone with one month or more of Part D during the year.

Chart Date: April 25, 2015

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Medicare Part D Enrollment by Plan Type, 2006 - 2013

Description: Medicare Part D enrollees may choose either a stand-alone prescription drug plan (PDP) or a managed care drug plan which includes wrap around medical coverage (i.e., Medicare Advantage [MA-PD]). MA-PD coverage is not fee-for-service (FFS), which means that the Medicare A and B claims are not observable for this subgroup. The proportion of Part D enrollees in managed care has increased from 25.4% in 2006 to 34.6% in 2013.

Technical Notes: Medicare Part D coverage includes anyone with one month or more of Part D during the year. The "Other" plan type includes employer sponsored plans, national PACE and demonstrations; in addition "Other" includes employer direct plans.

Chart Date: April 25, 2015

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Medicare Part D Enrollment by Subsidy Type, 2006 - 2013

Description: The proportion of Medicare Part D enrollees classified as dually eligible (i.e., enrolled in both Medicare and Medicaid) has declined slightly from 35.8% in 2006 to 28.7% in 2013. This is likely due to an influx of beneficiaries without any subsidy for Part D electing to purchase the benefit.

Technical Notes: Medicare Part D coverage includes anyone with one month or more of Part D during the year. Classification used the state-reported dual status variable to determine dual eligibility (DE; with a full LIS subsidy) and the cost-share group variable to determine non-dual eligible LIS status, where any month of DE or LIS resulted in such a classification.

Chart Date: April 25, 2015

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Medicare Part D Enrollment by Age Group, 2006 - 2013

Description: The population aged 65-74 years accounts for the largest proportion of the Part D enrollees. The proportion of enrollees comprised of 65-74 year olds has increased over time – from 38.6% in 2006 to 43.5% of the Part D enrolled population in 2013.

Technical Notes: Medicare Part D coverage includes anyone with one month or more of Part D during the year. Age is calculated based on age at the end of the calendar year.

Chart Date: April 25, 2015

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Medicare Part D Enrollment by Gender, 2006 - 2013

Description: Females accounted for 60.4% of all Medicare Part D enrollees in 2006. This proportion has declined slightly over time, to 57.8% in 2013.

Technical Notes: Medicare Part D coverage includes anyone with one month or more of Part D during the year.

Chart Date: April 25, 2015

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Medicare Part D Enrollment by Racial Group, 2006 - 2013

Description: The white racial group comprises the largest proportion of Part D enrollees, by racial group (74% of Part D enrollees in 2013). The second and third largest groups are the black and Hispanic racial groups (11% and 9.6% of all Part D enrollees, respectively).

Technical Notes: Medicare Part D coverage includes anyone with one month or more of Part D during the year. The RTI race variable is used; American Indian, Native American, Other, and Unknown races are grouped together due to small cell sizes.

Chart Date: April 25, 2015

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Medicare - Total Part D Events (fills), 2006 - 2013

Description: For Medicare Part D, all prescription drug events (PDEs) are present in the data – regardless of whether the beneficiary is enrolled in managed care or a fee-for-service plan. PDEs are available for all filled prescriptions that are covered as part of the Part D benefit. The total number of PDEs has increased over time since the inception of the benefit in 2006.

Technical Notes: Medicare Part D coverage includes anyone with one month or more of Part D during the year. The "Other" plan type includes employer sponsored plans, national PACE and demonstrations.

Chart Date: April 25, 2015

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Average Fills per Person per Month by Part D Plan Type, 2006 - 2013

Description: Medicare Part D enrollees may choose either a stand-alone prescription drug plan (PDP) or a managed care drug plan which includes wrap around medical coverage (i.e., Medicare Advantage [MA-PD]). The average number of PDEs per month has increased for all plan types over time. The average number of PDEs per month is much lower for those enrolled in MA-PD or "Other" plans than for those enrolled in PDP plans. PDP plans generally have a higher proportion of dual eligibles, who tend to be sicker and therefore high service utilizers, than other plan types.

Technical Notes: Monthly Part D enrollment counts were used to calculate average number of PDEs per month. For Medicare Part D, all prescription drug events (PDEs) are present – regardless of whether the beneficiary is enrolled in managed care or a fee-for-service plan. PDEs are available for all filled prescriptions that are covered as part of the Part D benefit. The "Other" plan type includes employer sponsored plans, national PACE and demonstrations.

Chart Date: April 25, 2015

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Average Monthly Fills by Medicare Status or Gender, 2013

Description: The average number of PDEs per month is shown for two variables on this graph - by reason for enrollment in Medicare, as well as the gender of the beneficiary. The average number of drugs is much higher for those enrolled due to a disability rather than due to aging into the Medicare benefit. Average fills are higher for females than males.

Technical Notes: Monthly Part D enrollment counts were used to calculate average number of PDEs per month. For Medicare Part D, all prescription drug events (PDEs) are present – regardless of whether the beneficiary is enrolled in managed care or a fee-for-service plan. PDEs are available for all filled prescriptions that are covered as part of the Part D benefit. The reason for enrollment in Medicare classification used the Medicare status code, and combined ESRD and Disabled categories into the "Disabled" grouping.

Chart Date: April 25, 2015

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Average Monthly Fills by Age Group, 2013

Description: The average number of PDEs per month is shown by age group. The highest average number is for the youngest group, which likely reflects enrollment due to disability rather than age.

Technical Notes: Monthly Part D enrollment counts were used to calculate average number of PDEs per month. For Medicare Part D, all prescription drug events (PDEs) are present – regardless of whether the beneficiary is enrolled in managed care or a fee-for-service plan. PDEs are available for all filled prescriptions that are covered as part of the Part D benefit. Fills may consist of different quantities of the drug; no adjustment was made to account for fills which provided more than a 30-day supply. Age is calculated at the end of the year.

Chart Date: April 25, 2015

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Average Monthly Fills by Part D Subsidy, 2013

Description: The average number of PDEs per month is shown by Part D subsidy status. Those classified as dually eligible (i.e., enrolled in both Medicare and Medicaid) have a much higher number of average monthly fills than those who have no subsidy. This is likely due to the Medicaid coverage requirements – including disability and medical need.

Technical Notes: Monthly Part D enrollment counts were used to calculate average number of PDEs per month. For Medicare Part D, all prescription drug events (PDEs) are present – regardless of whether the beneficiary is enrolled in managed care or a fee-for-service plan. PDEs are available for all filled prescriptions that are covered as part of the Part D benefit (note that some drugs may have covered by Medicaid and not Medicare; these drugs are not included in these calculations). Fills may consist of different quantities of the drug; no adjustment was made to account for fills which provided more than a 30-day supply. Classification used the state-reported dual status variable to determine dual eligibility (DE; this includes a fill LIS subsidy) and the cost-share group variable to determine LIS status, where any month of DE or LIS resulted in such a classification.

Chart Date: April 25, 2015

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Average Number of Prescription Fills per Month, 2013

Description: The average number of monthly prescription drug fills varies by state. Part D enrolled beneficiaries in Hawaii had the lowest average number of monthly fills (2.4) and Mississippi had the highest (4.0).

Technical Notes: Medicare Part D coverage includes anyone with one month or more of Part D during the year. All Medicare covered drugs were included in the count of drug fills. Fills may consist of different quantities of the drug; no adjustment was made to account for fills which provided more than a 30-day supply.

Chart Date: April 25, 2015

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