Exhibit 1
Most Non-LIS Medicare Part D Enrollees Did Not Switch Plans
Voluntarily During an Open Enrollment Period, 2006-2010
Switched plans Did not switch plans
12,6% 12,9% 12,1%
87,4% 87,1% 87,9%
PDP & MA-PD Enrollees PDP Enrollees MA-PD Enrollees
NOTES: LIS is Low-Income Subsidy. PDP is prescription drug plan. MA-PD is Medicare Advantage Prescription Drug Plan. Analysis includes non-LIS Medicare Part D enrollees in a PDP or MA-PD in one or more annual enrollment period from 2006 to 2010; estimates are averaged across four annual enrollment periods, 2006-2010. See Appendix 1 for full methodology.
SOURCE: Georgetown/NORC/Kaiser Family Foundation analysis of Medicare Beneficiary Summary Files and Plan Characteristics
Files, 2006-2010.

Exhibit 2
Switching Rates Among Non-LIS Part D Enrollees Were Similar
Across Four Annual Enrollment Periods and Different Plan Types
Switched plans Did not switch plans
10,6% 11,3% 9,4% 13,1% 13,6% 12,3% 11,8% 12,9% 10,1%
15,0% 13,6% 16,8%
89,4% 88,7% 90,6%
86,9% 86,4% 87,7% 88,2% 87,1% 89,9%
85,0% 86,4% 83,2%
PDP &
MA-PD
PDP MA-PD
2006-2007
PDP &
MA-PD
PDP MA-PD
2007-2008
PDP &
MA-PD
PDP MA-PD
2008-2009
PDP &
MA-PD
PDP MA-PD
2009-2010
NOTES: LIS is Low-Income Subsidy. PDP is prescription drug plan. MA-PD is Medicare Advantage Prescription Drug Plan. See
Appendix 1 for full methodology.
SOURCE: Georgetown/NORC/Kaiser Family Foundation analysis of Medicare Beneficiary Summary Files and Plan Characteristics
Files, 2006-2010.

Exhibit 3
Among Non-LIS Part D Enrollees Continuously Enrolled in PDPs
From 2006 to 2010, 7 out of 10 Never Voluntarily Switched Plans
1 switch
19,1%
Never switched
71,9%
2 switches
6,2%
3 switches
2,2%
Switched every year
0,5%
NOTES: LIS is Low-Income Subsidy. PDP is prescription drug plan. Analysis includes non-LIS Medicare Part D enrollees in a PDP continuously from 2006 to 2010 (n=313,418). See Appendix 1 for full methodology.
SOURCE: Georgetown/NORC/Kaiser Family Foundation analysis of Medicare Beneficiary Summary Files and Plan Characteristics
Files, 2006-2010.

Exhibit 4
Switching Rates In 2009-2010 Were Higher Among Non-LIS PDP
Enrollees Who Previously Switched Plans and Increased With the
Number of Prior Switches
45,9%
32,0%
16,7%
10,1%
6,7%
Total PDP-to-PDP switching rate
0 1 2 3
Number of Switches Prior to the 2009-2010 Enrollment Period
Share of enrollees:
100% 77.1% 16.7% 5.1% 1.1%
NOTES: LIS is Low-Income Subsidy. PDP is prescription drug plan. Analysis includes non-LIS Medicare Part D enrollees in a PDP continuously from 2006 to 2010 (n=313,418). See Appendix 1 for full methodology.
SOURCE: Georgetown/NORC/Kaiser Family Foundation analysis of Medicare Beneficiary Summary Files and Plan Characteristics
Files, 2006-2010.

Exhibit 5
A Larger Share of Non-LIS PDP Enrollees Who Switched Plans Had Lower
Costs in Year 2 Than in Year 1, Compared to Non-Switchers, 2006-2010
At least 5% lower At least 5% higher
Switchers 45.9% 46,4%
Premiums
Non-switchers 8.3% 77,9%
Switchers
Out-of-pocket drug costs
Non-switchers
47.3% 46,4%
42.1% 50,7%
NOTES: LIS is Low-Income Subsidy. PDP is prescription drug plan. Analysis includes non-LIS Medicare Part D enrollees in a PDP in one or more annual enrollment period from 2006 to 2010; excludes those who switched to a Medicare Advantage drug plan; estimates are averaged across four annual enrollment periods, 2006-2010. See Appendix 1 for full methodology.
SOURCE: Georgetown/NORC/Kaiser Family Foundation analysis of Medicare Beneficiary Summary Files and Plan Characteristics
Files, 2006-2010.

Exhibit 6
Switching Rates Were Higher Among Non-LIS PDP Enrollees Facing
Larger Premium Increases, Compared to Other Enrollees, 2006-2010
28,4%
21,3%
10,5%
7,8%
7,1%
Total PDP-to-PDP switching rate
Decrease Increase of up to
$10 or no change
Increase of $10 to
$20
Increase of $20 or more
Change in Monthly PDP Premium From Year 1 to Year 2
Share of enrollees
100% 13.0% 66.6% 16.6% 3.8%
NOTES: LIS is Low-Income Subsidy. PDP is prescription drug plan. Analysis includes non-LIS Medicare Part D enrollees in a PDP in one or more annual enrollment period from 2006 to 2010; excludes those who switched to a Medicare Advantage drug plan; estimates are averaged across four annual enrollment periods, 2006-2010. See Appendix 1 for full methodology.
SOURCE: Georgetown/NORC/Kaiser Family Foundation analysis of Medicare Beneficiary Summary Files and Plan Characteristics
Files, 2006-2010.

Exhibit 7
Switching Rates Were Higher Among Non-LIS PDP Enrollees Facing a Higher Deductible, Compared to Other PDP Enrollees, 2009-2010
18,9%
10,7%
10,0%
9,4%
Total PDP-to-PDP switching rate
Lower deductible Same deductible Higher deductible
Change in PDP Deductible From Year 1 to Year 2
Share of enrollees
100% 3.6% 83.5% 12.7%
NOTES: LIS is Low-Income Subsidy. PDP is prescription drug plan. Analysis includes non-LIS Medicare Part D enrollees in a PDP in the 2009-2010 annual enrollment period (n=438,006); excludes those who switched to a Medicare Advantage drug plan. See
Appendix 1 for full methodology.
SOURCE: Georgetown/NORC/Kaiser Family Foundation analysis of Medicare Beneficiary Summary Files and Plan Characteristics
Files, 2006-2010.

Exhibit 8
Switching Rates Were Higher Among Non-LIS PDP Enrollees Who Lost
Brand-Name Gap Coverage, Compared to Other Enrollees, 2006-2008
Total PDP-to-PDP switching rate Plan dropped brand-name gap coverage Plan made no change in gap coverage
50,3%
39,1%
9,4%
6,9%
11,5% 11,0%
2006-2007 2007-2008
Share of enrollees
100% 5.0% 89.0% 100% 1.3% 97.8%
NOTES: LIS is Low-Income Subsidy. PDP is prescription drug plan. Analysis includes non-LIS Medicare Part D enrollees in a PDP in one or more annual enrollment period from 2006 to 2008; excludes those in PDPs adding gap coverage and those who switched to a Medicare Advantage drug plan. See Appendix 1 for full methodology.
SOURCE: Georgetown/NORC/Kaiser Family Foundation analysis of Medicare Beneficiary Summary Files and Plan Characteristics
Files, 2006-2010.