Modifiers

Modifier	Description
D	Diagnosis or therapeutic site other than P or H when these are used as origin codes
E	Patient pronounced dead after ambulance called
G	Ambulance service provided under arrangement by a provider of services
H	Ambulance service furnished directly by a provider of services
I	Site of transfer (e.g. airport or helipad) between modes of ambulance transport
J	Freestanding ESRD facility
N	Skilled Nursing Facility (SNF)
P	Physician office
R	Residence
S	Scene of accident or acute event
X	Intermediate stop at physician's office on the way to hospital - use as a destination only

Additional modifiers

Modifier	Description
GM	Multiple patients on one ambulance trip
QL	Patient pronounced dead after ambulance called
QM	Ambulance service provided under arrangement by a provider of services
QN	Ambulance service furnished directly by a provider of services