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This variable is contained in the following files: Plan Characteristics File, Part D Formulary File
SAS Name
TIER_ID

Medicare Part D formulary tier identifier. This field represents the cost sharing tier in which the product was placed in the sponsor's formulary.

This identifier is also a key that links a Part D sponsor's cost sharing tier record to a prescription drug event record via contract ID, plan ID, and tier ID.

Comments

Up to six tiers are possible.

The CCW constructs the Plan Characteristics File from information submitted by plan sponsors to CMS’s Health Plan Management System (HPMS).

Source: CMS (HPMS Files)

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