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SAS Name
CLM_ADMSN_DT

On an institutional claim, the date the beneficiary was admitted to the hospital, skilled nursing facility, or religious non- medical health care institution.

For home health services, this is the date care started for the HH services reported on the encounter record. 

Comments

For HH, this date indicates the date the home health plan was established or last reviewed.

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. 

Source: Medicare Advantage Organizations (MAOs)