| 2007 NAICS | 2012 NAICS | 2017 NAICS | Corresponding Index Entries | |||
| 621512 | 621512 | 621512 | CAT (computerized axial tomography) scanner centers | |||
| 621512 | 621512 | 621512 | Computer tomography (CT-SCAN) centers | |||
| 621512 | 621512 | 621512 | CT-SCAN (computer tomography) centers | |||
| 621512 | 621512 | 621512 | Dental X-ray laboratories | |||
| 621512 | 621512 | 621512 | Diagnostic imaging centers (medical) | |||
| 621512 | 621512 | 621512 | Laboratories, dental X-ray | |||
| 621512 | 621512 | 621512 | Laboratories, medical radiological or X-ray | |||
| 621512 | 621512 | 621512 | Laboratory testing services, medical radiological or X-ray | |||
| 621512 | 621512 | 621512 | Magnetic resonance imaging (MRI) centers | |||
| 621512 | 621512 | 621512 | Mammogram (i.e., breast imaging) centers | |||
| 621512 | 621512 | 621512 | Medical laboratories, radiological or X-ray | |||
| 621512 | 621512 | 621512 | Medical radiological laboratories | |||
| 621512 | 621512 | 621512 | Medical X-ray laboratories | |||
| 621512 | 621512 | 621512 | Mobile breast imaging centers | |||
| 621512 | 621512 | 621512 | Mobile X-ray facilities (medical) | |||
| 621512 | 621512 | 621512 | MRI (magnetic resonance imaging) centers | |||
| 621512 | 621512 | 621512 | Positron emission tomography (PET) scanner centers | |||
| 621512 | 621512 | 621512 | Radiological laboratories, medical | |||
| 621512 | 621512 | 621512 | Radiological laboratory services, medical | |||
| 621512 | 621512 | 621512 | Single photon emission computerized tomography (SPECT) centers | |||
| 621512 | 621512 | 621512 | Ultrasound imaging centers | |||
| 621512 | 621512 | 621512 | X-ray laboratories, medical or dental |