Data as of February 1, 2009.

Residence Unknown includes beneficiaries in the territories and beneficiaries whose address information is being updated.
The Medicare Prescription Drug, Improvement, and Modernization Act of 2003 (MMA) added prescription drug coverage to Medicare (Medicare Part D), beginning on January 1, 2006. People on Medicare can obtain the Medicare drug benefit through two types of private plans: a stand-alone prescription drug plan (PDP) for beneficiaries in the traditional fee-for-service program or a Medicare Advantage (MA) plan, such as an HMO or PPO.

For more information, visit Kaiser's Resources on the Medicare Drug Benefit, available at http://www.kff.org/medicare/rxdrugbenefit.cfm.

Centers for Medicare and Medicaid Services (CMS), released February 2009, available at http://www.cms.hhs.gov/prescriptiondrugcovgenIn/.

Stand-Alone PDP: Medicare plans that cover only prescription drugs.
Medicare Advantage Drug Plans (MA-PDs): Total includes enrollees in Local CCPs, PFFS plans, Employer Direct PFFS plans, MSAs, Regional PPOs, and other health plan types with prescription drug coverage (Demo; Cost; PACE; Chronic Care).
Other Prescription Drug Coverage: Total includes Medicare beneficiaries with drug coverage through FEHB, TRICARE, VA and active workers.
FEHB: The Federal Employee Health Benefit program provides health insurance coverage to federal employees, retirees and their dependents.
TRICARE: A federal health care program for active duty and retired uniformed services members and their families.
Beneficiaries with Known Creditable Drug Coverage: Total excludes approximately 2.0 million beneficiaries with the following sources of drug coverage because these data are currently not available at the state level: other retiree coverage not enrolled in RDS (1.5 million); Medigap and other individual insurance (.2 million); State Pharmaceutical Insurance Programs (.02 million), Indian Health Service Coverage (.03 million); other sources (.30 million includes FEHB spouses and dependents).

1. Includes approximately 8.0 million beneficiaries receiving the low-income subsidy.
2. Includes approximately 1.7 million beneficiaries who are receiving the low-income subsidy.
3. Includes: Local CCPs; PFFS;Employer Direct PFFS; MSA; Regional PPOs; and Other Health Plan Types with Prescription Drug Coverage (Demo; Cost; PACE; Chronic Care).
4. Includes FEHB, TRICARE, VA, and Active Workers.
5. Does not include 2 million with coverage for whom data are only available at the national level.