I have had clinicians order this test and others on archived material.  I
use the date that the test was ordered as the date of service and generate
a new billing number as of that date.  This is simply another order from a
clinician, but instead of getting new material, it is done on the archived
material.

The key, I believe, is the order from the clinician.

What do the rest of you do?

Priscilla in Central Wyoming