| 128 / | HD | SURGERY |
| 200.24 | DF | RESPIRATORY METHOD OR DEVICE {32} |
| 205.27 | DF | .~ Means for removing substance from respiratory gas {2} |
| 205.29 | DF | .~.~ Particulate filtering {2} |
| 206.12 | DF | .~.~.~ Face mask covering a breathing passage {7} |
| 206.18 | | .~.~.~.~ Covering nose only |