One of the coding guidelines deals with the rare instance in which two or more contrasting or comparative diagnoses are documented as "either/or" (or similar terminology). These diagnoses are coded as if they were confirmed. They are sequenced according to the circumstances of the admission. Either diagnosis may be sequenced first. For example, a patient is admitted with symptoms of abdominal pain with nausea and vomiting determined to be due to pyelonephritis or diverticulitis. The patient has a confirmed diagnosis for both conditions, and both conditions are treated equally. Which UHDDS definition terms are used to describe this situation?

A. Coequal diagnoses
B. Comparative or contrasting
C. Symptom followed by comparative or contrasting
D. Original treatment plan not carried out