For POA reporting, “present on admission” refers to a condition present at the time the order for inpatient admission occurs. Conditions that develop during an outpatient encounter—including emergency-department, observation, or outpatient surgery care—before the inpatient admission order are generally considered POA when they are present at that inpatient admission point.
Therefore, the NSTEMI in this scenario is considered present on admission even though it developed after the patient physically arrived at the hospital.
This distinction is essential because hospital arrival and inpatient admission are not synonymous for POA purposes. A patient may spend hours in the ED or observation status before an inpatient order is entered.
The POA indicator applies to applicable principal and secondary diagnoses and is important to CMS's HAC payment provisions as well as quality analysis. A condition does not become hospital acquired merely because it arose somewhere on hospital premises before inpatient status began.
CDI specialists should clarify timing when the record does not establish whether a diagnosis existed before or after the inpatient admission order rather than relying solely on note timestamps or physical location.
The FY 2026 ICD-10-CM Official Guidelines contain the governing POA definitions and reporting rules.
CCDS Reference Topics: POA; emergency department; observation; timing of diagnosis; HAC payment logic.
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