I hope this is the correct place to ask this question. I have seen a cosswalk from the HCFA1500 to the 837. When referencing box 20 "Outside Lab Yes/No and Changes", it was not clear how these should be mapped. So, I would like to ask if the following then could be considered correct:
In Loop ID - 2310D Service Facility Location, outside lab my will be identified by the identifiers on the NM1 segment. If the NM101 Entity Code is "IL", this will indicate that the "Outside Lab is Yes". For these transactions, a PS1 segment will be required in loop 2400 to disclose the changes to be reported in box 20 charges. If the NM101 Entity Code is "TL", this will indicate an affiliated "Testing Laboratory", so, box 20 "Outside Lab is NO". No PS1 segment will be required because charges are not required when Outside Lab is NO. Bob Ford [EMAIL PROTECTED] 401-822-1962
