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This variable is contained in the following files:
SAS Name
TAX_NUM
The federal taxpayer identification number (TIN) that identifies the physician/practice/supplier to whom payment is made for the line-item service on the noninstitutional claim.
This number may be an employer identification number (EIN) or social security number (SSN).
Source: NCH
For DME claims, all 10 digits are populated. The first 9 digits represent the EIN or SSN, and the final (rightmost) tenth digit indicate the type of provider ID that is used (reference the DMERC_LINE_SUPPLR_TYPE_CD for these values). For all other claim types, only 9 digits of the field are populated.