Claim Principal Diagnosis Code (Encounter)

SAS Name
PRNCPAL_DGNS_CD

The diagnosis code identifying the diagnosis, condition, problem or other reason for the admission/encounter/visit shown in the medical record to be chiefly responsible for the services provided.

This data is also redundantly stored as the first occurrence of the diagnosis code (variable called ICD_DGNS_CD1). 

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Source: Medicare Advantage Organizations (MAOs)