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Short SAS Name
CLM_CNTL_NUM
SAS Name
CLM_CNTL_NUM

The claim control number is an identifier assigned by the processing system (i.e., the Encounter Data System Contractor) to a claim.

This is the field that, in combination with the original claim control number, identifies a unique version of a service record.

Comments

Multiple iterations of a single service (i.e., a particular type of claim for a specific service date for the person) are present in the Encounter RIFs; records are not limited to the final version of the encounter record.   When multiple records for a service exist, the higher the claim control number, the later it was adjusted (i.e., the highest CLM_CNTL_NUM is the latest version of the encounter). 

Source: CMS Encounter Data System (EDS)