Duration Of Mechanical Vent for ICD10-PCS

If a patient is intubated in the field and comes to the ED, placed on the ventilator in ED and later admitted, when do you count the start of the ventilator time?

Coding clinic states that if the patient is intubated PTA, the start time for counting duration is the time of admission. Is that the time the vent is started in the ED or is it the official time of admission to inpatient status per physician order?

Thanks for input.

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Duration Of Mechanical Vent for ICD10-PCS