Columbia subject headings:
Insurance, Pharmaceutical services--United States.
Managed care plans (Medical care)--United States.
Medicare.
Older people--Pharmaceutical assistance--United States.
Harvard subject headings:
Managed care plans (Medical care)--United States.
Medicare.
Older people--Pharmaceutical assistance--United States.
Pharmaceutical services insurance--United States.
Princeton subject headings:
Managed care plans (Medical care)--United States.
Medicare.
Older people--Pharmaceutical assistance--United States.
Pharmaceutical services insurance--United States.