TY  - GEN
TI  - Four or more tiers common among PDPs and MA-PD plans
SN  - 1062-3388
PY  - 2006///0502
KW  - Formularies as Topic
KW  - Insurance, Pharmaceutical Services
KW  - trends
KW  - Medicare
KW  - United States
N1  - Publication Type: Journal Article
ER  -