Principal diagnosis selection

Can anyone give feedback and when to use prematurity as Principal diagnosis? What scenarios should you be reporting prematurity as Pdx? Our NICU will sometimes get transfers from an OSH for an extreme premature baby that another NICU has been caring for...The baby will present to us for "feeding problems". However will have a many problems going on upon arrival which all stem back to the extreme prematurity. 

Another questions is selection of respiratory failure as pdx. We get alot of patients with RSV bronchiolitis, status asthmaticus, pneumonias/aspiration pna. Generally we will sequence the above diagnoses as Pdx and use the acute respiratory failure as secondary. We just got a new coding manager at our facility and she wants to use respiratory failure as Pdx in these situations. I'm looking for any insight on these matters. 

Thank you for your time :) 
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