What does the term "present on admission" mean?

A. The diagnosis or diagnoses for which a patient has been admitted to an inpatient facility
B. A clinical situation in which both a physician and an NPP have participated in the performance of one E/M service; must meet all incident-to requirements
C. A billing phrase used by CMS to help identify, report, and appropriately bill incidental clinical, medical, or professional services performed by an NPP that are integral to the physician's overall care of the patient
D. The numeric codes that identify the specific settings in which the E/M services occurred

A