From the
AMA guidelines:
Unique: A unique test is defined by the CPT code set. When multiple results of the same unique
test (eg, serial blood glucose values) are compared during an E/M service, count it as one unique
test. Tests that have overlapping elements are not unique, even if they are identified with distinct
CPT codes. For example, a CBC with differential would incorporate the set of hemoglobin, CBC
without differential, and platelet count. A unique source is defined as a physician or other
qualified health care professional in a distinct group or different specialty or subspecialty, or a
unique entity. Review of all materials from any unique source counts as one element toward
MDM.
If the testing the provider is doing in house, and the testing sent out are different CPT codes, then they are 2 unique tests.