Final answer:
The POA indicator for sepsis in the case of the patient is 'U' as it is unknown and insufficiently documented whether the sepsis was present at the time of admission.
Step-by-step explanation:
In the scenario described where a 45 year old female patient presents to the Emergency Room (ER) with shortness of breath, cough, and a high fever, and is later admitted with pneumonia prior to the development of sepsis, the appropriate Present on Admission (POA) indicator for sepsis would be 'U' (documentation is insufficient to determine if the condition was present at the time of inpatient admission). The POA indicator 'U' signifies that it is unknown whether the condition was present at the time of inpatient admission, and the documentation is insufficient to determine whether it was present on admission or not. As the physician indicated it was unknown if the patient was septic prior to admission, 'U' is the most appropriate POA indicator to assign to the diagnosis of sepsis.