When coding an encounter for a patient with a localized infection that develops into sepsis after admission, what should be the first code assigned?

In the scenario where a patient initially presents with a localized infection that later progresses to sepsis, the first code to be assigned should reflect the patient's condition at the outset of the encounter. Coding guidelines emphasize that the primary diagnosis should accurately represent the reason for the admission or encounter.

Assigning a code for the localized infection first captures the initial problem for which the patient was treated. This approach maintains clarity in the patient's clinical picture and ensures that the coding aligns with the timing of the patient's condition. Properly coding the localized infection also helps in tracking the course of treatment and subsequent complications, such as the development of sepsis, which can be reported with an additional code.

While other codes might be relevant for documenting the progression to sepsis, they should follow the localized infection code to accurately depict the sequence of events in the patient's treatment history. This coding structure promotes a logical and structured manner of documenting medical encounters.