| 4A0204Z | Measurement of Cardiac Electrical Activity, Open Approach |
| 4A0209Z | Measurement of Cardiac Output, Open Approach |
| 4A020CZ | Measurement of Cardiac Rate, Open Approach |
| 4A020FZ | Measurement of Cardiac Rhythm, Open Approach |
| 4A020HZ | Measurement of Cardiac Sound, Open Approach |
| 4A020N6 | Measurement of Cardiac Sampling and Pressure, Right Heart, Open Approach |
| 4A020N7 | Measurement of Cardiac Sampling and Pressure, Left Heart, Open Approach |
| 4A020N8 | Measurement of Cardiac Sampling and Pressure, Bilateral, Open Approach |
| 4A020PZ | Measurement of Cardiac Action Currents, Open Approach |
| 4A0234Z | Measurement of Cardiac Electrical Activity, Percutaneous Approach |
| 4A0239Z | Measurement of Cardiac Output, Percutaneous Approach |
| 4A023CZ | Measurement of Cardiac Rate, Percutaneous Approach |
| 4A023FZ | Measurement of Cardiac Rhythm, Percutaneous Approach |
| 4A023HZ | Measurement of Cardiac Sound, Percutaneous Approach |
| 4A023N6 | Measurement of Cardiac Sampling and Pressure, Right Heart, Percutaneous Approach |
| 4A023N7 | Measurement of Cardiac Sampling and Pressure, Left Heart, Percutaneous Approach |
| 4A023N8 | Measurement of Cardiac Sampling and Pressure, Bilateral, Percutaneous Approach |
| 4A023PZ | Measurement of Cardiac Action Currents, Percutaneous Approach |
| 4A0274Z | Measurement of Cardiac Electrical Activity, Via Natural or Artificial Opening |
| 4A0279Z | Measurement of Cardiac Output, Via Natural or Artificial Opening |
| 4A027CZ | Measurement of Cardiac Rate, Via Natural or Artificial Opening |
| 4A027FZ | Measurement of Cardiac Rhythm, Via Natural or Artificial Opening |
| 4A027HZ | Measurement of Cardiac Sound, Via Natural or Artificial Opening |
| 4A027N6 | Measurement of Cardiac Sampling and Pressure, Right Heart, Via Natural or Artificial Opening |
| 4A027N8 | Measurement of Cardiac Sampling and Pressure, Bilateral, Via Natural or Artificial Opening |
| 4A027PZ | Measurement of Cardiac Action Currents, Via Natural or Artificial Opening |
| 4A0284Z | Measurement of Cardiac Electrical Activity, Via Natural or Artificial Opening Endoscopic |
| 4A0289Z | Measurement of Cardiac Output, Via Natural or Artificial Opening Endoscopic |
| 4A028CZ | Measurement of Cardiac Rate, Via Natural or Artificial Opening Endoscopic |
| 4A028FZ | Measurement of Cardiac Rhythm, Via Natural or Artificial Opening Endoscopic |
| 4A028HZ | Measurement of Cardiac Sound, Via Natural or Artificial Opening Endoscopic |
| 4A028N6 | Measurement of Cardiac Sampling and Pressure, Right Heart, Via Natural or Artificial Opening Endoscopic |
| 4A028N7 | Measurement of Cardiac Sampling and Pressure, Left Heart, Via Natural or Artificial Opening Endoscopic |
| 4A028N8 | Measurement of Cardiac Sampling and Pressure, Bilateral, Via Natural or Artificial Opening Endoscopic |
| 4A028PZ | Measurement of Cardiac Action Currents, Via Natural or Artificial Opening Endoscopic |
| 4A02X4A | Measurement of Cardiac Electrical Activity, Guidance, External Approach |
| 4A02X4Z | Measurement of Cardiac Electrical Activity, External Approach |
| 4A02X9Z | Measurement of Cardiac Output, External Approach |
| 4A02XCZ | Measurement of Cardiac Rate, External Approach |
| 4A02XFZ | Measurement of Cardiac Rhythm, External Approach |
| 4A02XHZ | Measurement of Cardiac Sound, External Approach |
| 4A02XM4 | Measurement of Cardiac Total Activity, External Approach |
| 4A02XPZ | Measurement of Cardiac Action Currents, External Approach |
