Sayaka Kanda onEnumeration basically relates to the number of NPIs a provider has and the different
“parts” of a provider that are associated with those NPIs. For example in the past a
small hospital may have had three Highmark Legacy Numbers with a different
number for the main hospital, an emergency room, and labor and delivery (its
Highmark Legacy Enumeration).
In the NPI world, the hospital may choose to
enumerate in the same manner as it had before (three NPIs, one for each of the
three parts mentioned above) or it may, under the regulations, choose to enumerate
with a single NPI (one number for the whole hospital regardless of subpart).
Highmark is urging, though it cannot require, that providers try to match their existing
structure as closely as possible in order to avoid confusion and reduce the risk of
delays. In the event that a provider does not enumerate the same way, Highmark
will attempt to map the new structure to the old one internally within Highmark using
additional data-elements. That process of mapping has a small risk of error which
may slow down transaction processing in a limited number of instances.