On an institutional claim, the date the beneficiary was admitted to the hospital, skilled nursing facility, or religious non-medical health care institution. When this variable appears in the HHA claims (Short Name = HHSTRTDT), it is the date the care began for the HHA services reported on the claim.
The date in this variable may precede the claim from date (CLM_FROM_DT) if this claim is for a beneficiary who has been continuously under care.
In HHA claims, this is the date the home health plan was established or last reviewed.
This field is not well populated in HHA until after 2011.