Site of service and specialty groups studied with the corresponding codes
| Site Group/Specialty Group | Sites (Code) |
|---|---|
| Outpatient | Office (11), outpatient hospital (19 and 22), independent clinic (49) |
| Inpatient | Inpatient hospital (21) |
| Emergency department | Emergency department (23) |
| Other | Other: independent laboratory (81), skilled nursing facility (31), temporary lodging (16), mobile unit (15), home (12), and other place of service (99) |
| Radiology | Diagnostic radiology (30), interventional radiology (94), and nuclear medicine (36) |
| Neurology | Neurology (13) |
| Neurosurgery | Neurosurgery (14) |
| Others | All other identifiable groups |
| Unidentified | Unidentified: independent diagnostic testing facility (47), single or multispecialty clinic or group practice (70), unknown physician specialty (99) |