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This variable is contained in the following files: Plan Characteristics File
SAS Name
EFFECTIVE_DATE

This variable is the date the Part D plan sponsor began offering the particular plan benefit package.

Comments

This is the date the contract (CONTRACT_ID) and benefit package number (PLAN_ID) was first offered.

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)

date