D Diagnostic or therapeutic site other than "P" or "H" when these are used as origin codes
E Residential, domiciliary, custodial facility (other than 1819 facility)
G Hospital-based ESRD facility
H Hospital
I Site of transfer (e.g., airport or helicopter pad) between modes of ambulance transport
J Free-standing ESRD facility
N Skilled nursing facility (SNF)
P Physician's office
R Residence
S Scene of accident or acute event
X Intermediate stop at physician's office on way to hospital (includes HMO non-hospital facility, clinic, etc. destination code only).
Note: Modifier X can only be used as a destination code in the second position of a modifier.
Non-OPPS hospitals, Critical Access Hospitals (CAHs), Indian Health Services Hospitals (IHS), hospitals located in American Samoa, Guam, Saipan, or the Virgin Islands, and Maryland waiver hospitals may report these codes at their discretion.
20 Miss. Code. R. 2-II