| 600 / | HD | SURGERY |
| 300 | DF | DIAGNOSTIC TESTING {38} |
| 481 | DF | .~ Cardiovascular {6} |
| 508 | DF | .~.~ Heart {4} |
| 509 | DF | .~.~.~ Detecting heartbeat electric signal {10} |
| 522 | ![]() | .~.~.~.~ Switching means for activating different monitoring systems, signal displays, or signal recorders |