This data element determines the billing provider and service facility
"" if the service facility is blank - when there is no service
facility
[4] service facility IEN - either an IEN to file 4 or to file 355.93
or "" if the service facility is blank
information as defined with IB patch 400.
This function returns a string in the following format:
[1] billing provider Institution file pointer (IEN to file 4) or "0"
if the billing provider cannot be determined
[2] billing provider name (.01 field in file 4) or Error reason why
the billing provider cannot be determined - used when piece [1]=0
[3] 0 if the service facility is a VA institution in file 4
1 if the service facility is a non-VA facility in file 355.93
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