| Origin/Destination | Description |
|---|---|
| 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 | Freestanding ESRD facility |
| N | Skilled nursing facility |
| P | Physician’s office |
| R | Residence |
| S | Scene of accident or acute event |
| X | Intermediate stop at physician’s office on way to hospital (This is a destination code only) |
| 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 |
| GY | Item or service is statutorily excluded or does not meet the definition of any Medicare benefit |
| GW | Service not related to the hospice patient's terminal condition. |