1. If a health plan receives the subscriber ID number and the subscriber last name in the X12 270 inquiry, does the health plan have to use the subscriber last name or can they ignore the subscriber last name when processing the X12 270 Inquiry?
The CAQH CORE 258 Rule does not require that a health plan use the patient’s last name in its search and matching logic for locating an individual within its systems. Further, the rule does not specify the search criteria used by a health plan (or information source) to identify a patient in its systems.