I have a hospital that is licensed as an acute care hospital and they have a psych unit where they provide psych services - would they report POS 21 or 51? When would you report POS 52?

Also what about an acute care hospital that has a rehab unit - POS 61 or 21?

I am struggling to find out what criteria needs to be met to report 51 or 61 in lieu of 21?

please email me at: coding_compliance@msn.com or you can reach me at 913-768-1212