TABLE 1.

Beneficiaries by age and original reason for eligibility

	Total	Original reason for eligibility = aged		Original reason for eligibility = disability, end-stage renal disease, or Alzheimer’s
		Age 65 +		Age 65 +		Age <65
2001	5,760,821	4,563,388	79.2%	422,207	7.3%	775,226	13.5%
2002	5,959,061	4,701,352	78.9%	442,511	7.4%	815,198	13.7%
2003	6,095,807	4,779,197	78.4%	458,698	7.5%	857,912	14.1%
2004	6,143,162	4,781,953	77.8%	465,479	7.6%	895,730	14.6%
2005	6,129,633	4,740,059	77.3%	467,811	7.6%	921,763	15.0%
2006	5,974,412	4,607,287	77.1%	459,927	7.7%	907,198	15.2%
2007	5,887,761	4,506,823	76.5%	460,829	7.8%	920,109	15.6%
2008	5,820,956	4,427,286	76.1%	465,482	8.0%	928,188	15.9%
2009	5,871,707	4,429,056	75.4%	476,663	8.1%	965,988	16.5%
2010	5,958,291	4,462,672	74.9%	498,891	8.4%	996,728	16.7%

Notes: The following types of beneficiaries were excluded from the sample: newly eligible beneficiaries since no prior claims information was available with which to compute a risk score and beneficiaries who did not have 12 months of continuous enrollment in TM, both Parts A and B, in the prior year. In addition, beneficiaries who switched into cost MA plans or Special Needs Plans were excluded.