ICD-10-PCS 4A0 Measurement and Monitoring: Physiological Systems Measurement
The ICD-10-PCS root operation Measurement (code 4A0) under the Measurement and Monitoring classification refers to the process of quantifying physiological parameters of body systems. This procedure captures specific bodily functions and activities without altering the anatomy.
Measurement includes various methods such as open, percutaneous, external, or via natural or artificial openings (including endoscopic) to assess vital physiological data. Examples from the code set demonstrate measuring the electrical activity, pressure, conductivity, and flow within central and peripheral nervous systems, cardiac function (such as cardiac output, rhythm, rate, and pressure), respiratory parameters (rate, flow, volume, resistance), lymphatic flow and pressure, urinary functions, and musculoskeletal contractility. Approaches vary to suit the target body part and clinical need, such as measuring intracranial pressure via percutaneous or open methods (e.g., 4A003BD, 4A000BZ) or assessing arterial flow in peripheral vessels by open or external approaches (e.g., 4A03051, 4A03X51). This detailed coding enables precise documentation of physiological system assessments crucial for diagnosis and treatment monitoring.
List of ICD-10-PCS codes used to specify 4A0 - Measurement (determining the level of a physiological or physical function at a point in time). There are a total of 222 procedure codes in this section.
4A0 - Measurement and Monitoring, Physiological Systems, Measurement
4A0002Z - Measurement of Central Nervous Conductivity, Open Approach
4A0004Z - Measurement of Central Nervous Electrical Activity, Open Approach
4A000BZ - Measurement of Central Nervous Pressure, Open Approach
4A0034Z - Measurement of Central Nervous Electrical Activity, Percutaneous Approach
4A003BD - Measurement of Intracranial Pressure, Percutaneous Approach
4A003KD - Measurement of Intracranial Temperature, Percutaneous Approach
4A003RD - Measurement of Intracranial Saturation, Percutaneous Approach
4A0074Z - Measurement of Central Nervous Electrical Activity, Via Natural or Artificial Opening
4A007BD - Measurement of Intracranial Pressure, Via Natural or Artificial Opening
4A007KD - Measurement of Intracranial Temperature, Via Natural or Artificial Opening
4A007RD - Measurement of Intracranial Saturation, Via Natural or Artificial Opening
4A0084Z - Measurement of Central Nervous Electrical Activity, Via Natural or Artificial Opening Endoscopic
4A008BD - Measurement of Intracranial Pressure, Via Natural or Artificial Opening Endoscopic
4A008KD - Measurement of Intracranial Temperature, Via Natural or Artificial Opening Endoscopic
4A008RD - Measurement of Intracranial Saturation, Via Natural or Artificial Opening Endoscopic
4A00X2Z - Measurement of Central Nervous Conductivity, External Approach
4A00X4Z - Measurement of Central Nervous Electrical Activity, External Approach
4A01029 - Measurement of Peripheral Nervous Conductivity, Sensory, Open Approach
4A0102B - Measurement of Peripheral Nervous Conductivity, Motor, Open Approach
4A0104Z - Measurement of Peripheral Nervous Electrical Activity, Open Approach
4A01329 - Measurement of Peripheral Nervous Conductivity, Sensory, Percutaneous Approach
4A0132B - Measurement of Peripheral Nervous Conductivity, Motor, Percutaneous Approach
4A0134Z - Measurement of Peripheral Nervous Electrical Activity, Percutaneous Approach
4A01729 - Measurement of Peripheral Nervous Conductivity, Sensory, Via Natural or Artificial Opening
4A0172B - Measurement of Peripheral Nervous Conductivity, Motor, Via Natural or Artificial Opening
4A0174Z - Measurement of Peripheral Nervous Electrical Activity, Via Natural or Artificial Opening
4A01829 - Measurement of Peripheral Nervous Conductivity, Sensory, Via Natural or Artificial Opening Endoscopic
4A0182B - Measurement of Peripheral Nervous Conductivity, Motor, Via Natural or Artificial Opening Endoscopic
4A0184Z - Measurement of Peripheral Nervous Electrical Activity, Via Natural or Artificial Opening Endoscopic
4A01X29 - Measurement of Peripheral Nervous Conductivity, Sensory, External Approach
4A01X2B - Measurement of Peripheral Nervous Conductivity, Motor, External Approach
4A01X4Z - Measurement of Peripheral Nervous Electrical Activity, External Approach
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
4A027N7 - Measurement of Cardiac Sampling and Pressure, Left 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
4A03051 - Measurement of Arterial Flow, Peripheral, Open Approach
4A03053 - Measurement of Arterial Flow, Pulmonary, Open Approach
4A0305C - Measurement of Arterial Flow, Coronary, Open Approach
4A030B1 - Measurement of Arterial Pressure, Peripheral, Open Approach
4A030B3 - Measurement of Arterial Pressure, Pulmonary, Open Approach
4A030BC - Measurement of Arterial Pressure, Coronary, Open Approach
4A030BF - Measurement of Arterial Pressure, Other Thoracic, Open Approach
4A030H1 - Measurement of Arterial Sound, Peripheral, Open Approach
4A030J1 - Measurement of Arterial Pulse, Peripheral, Open Approach
4A030J3 - Measurement of Arterial Pulse, Pulmonary, Open Approach
4A030JC - Measurement of Arterial Pulse, Coronary, Open Approach
4A030R1 - Measurement of Arterial Saturation, Peripheral, Open Approach
4A03351 - Measurement of Arterial Flow, Peripheral, Percutaneous Approach
4A03353 - Measurement of Arterial Flow, Pulmonary, Percutaneous Approach
4A0335C - Measurement of Arterial Flow, Coronary, Percutaneous Approach
4A033B1 - Measurement of Arterial Pressure, Peripheral, Percutaneous Approach
4A033B3 - Measurement of Arterial Pressure, Pulmonary, Percutaneous Approach
4A033BC - Measurement of Arterial Pressure, Coronary, Percutaneous Approach
4A033BF - Measurement of Arterial Pressure, Other Thoracic, Percutaneous Approach
4A033H1 - Measurement of Arterial Sound, Peripheral, Percutaneous Approach
4A033J1 - Measurement of Arterial Pulse, Peripheral, Percutaneous Approach
4A033J3 - Measurement of Arterial Pulse, Pulmonary, Percutaneous Approach
4A033JC - Measurement of Arterial Pulse, Coronary, Percutaneous Approach
4A033R1 - Measurement of Arterial Saturation, Peripheral, Percutaneous Approach
4A03X51 - Measurement of Arterial Flow, Peripheral, External Approach
4A03X5D - Measurement of Arterial Flow, Intracranial, External Approach
4A03XB1 - Measurement of Arterial Pressure, Peripheral, External Approach
4A03XH1 - Measurement of Arterial Sound, Peripheral, External Approach
4A03XJ1 - Measurement of Arterial Pulse, Peripheral, External Approach
4A03XR1 - Measurement of Arterial Saturation, Peripheral, External Approach
4A04050 - Measurement of Venous Flow, Central, Open Approach
4A04051 - Measurement of Venous Flow, Peripheral, Open Approach
4A04052 - Measurement of Venous Flow, Portal, Open Approach
4A04053 - Measurement of Venous Flow, Pulmonary, Open Approach
4A040B0 - Measurement of Venous Pressure, Central, Open Approach
4A040B1 - Measurement of Venous Pressure, Peripheral, Open Approach
4A040B2 - Measurement of Venous Pressure, Portal, Open Approach
4A040B3 - Measurement of Venous Pressure, Pulmonary, Open Approach
4A040J0 - Measurement of Venous Pulse, Central, Open Approach
4A040J1 - Measurement of Venous Pulse, Peripheral, Open Approach
4A040J2 - Measurement of Venous Pulse, Portal, Open Approach
4A040J3 - Measurement of Venous Pulse, Pulmonary, Open Approach
4A040R1 - Measurement of Venous Saturation, Peripheral, Open Approach
4A04350 - Measurement of Venous Flow, Central, Percutaneous Approach
4A04351 - Measurement of Venous Flow, Peripheral, Percutaneous Approach
4A04352 - Measurement of Venous Flow, Portal, Percutaneous Approach
4A04353 - Measurement of Venous Flow, Pulmonary, Percutaneous Approach
4A043B0 - Measurement of Venous Pressure, Central, Percutaneous Approach
4A043B1 - Measurement of Venous Pressure, Peripheral, Percutaneous Approach
4A043B2 - Measurement of Venous Pressure, Portal, Percutaneous Approach
4A043B3 - Measurement of Venous Pressure, Pulmonary, Percutaneous Approach
4A043J0 - Measurement of Venous Pulse, Central, Percutaneous Approach
4A043J1 - Measurement of Venous Pulse, Peripheral, Percutaneous Approach
4A043J2 - Measurement of Venous Pulse, Portal, Percutaneous Approach
4A043J3 - Measurement of Venous Pulse, Pulmonary, Percutaneous Approach
4A043R1 - Measurement of Venous Saturation, Peripheral, Percutaneous Approach
4A044B2 - Measurement of Venous Pressure, Portal, Percutaneous Endoscopic Approach
4A04X51 - Measurement of Venous Flow, Peripheral, External Approach
4A04XB1 - Measurement of Venous Pressure, Peripheral, External Approach
4A04XJ1 - Measurement of Venous Pulse, Peripheral, External Approach
4A04XR1 - Measurement of Venous Saturation, Peripheral, External Approach
4A05XLZ - Measurement of Circulatory Volume, External Approach
4A0605Z - Measurement of Lymphatic Flow, Open Approach
4A060BZ - Measurement of Lymphatic Pressure, Open Approach
4A0635Z - Measurement of Lymphatic Flow, Percutaneous Approach
4A063BZ - Measurement of Lymphatic Pressure, Percutaneous Approach
4A0675Z - Measurement of Lymphatic Flow, Via Natural or Artificial Opening
4A067BZ - Measurement of Lymphatic Pressure, Via Natural or Artificial Opening
4A0685Z - Measurement of Lymphatic Flow, Via Natural or Artificial Opening Endoscopic
4A068BZ - Measurement of Lymphatic Pressure, Via Natural or Artificial Opening Endoscopic
4A07X0Z - Measurement of Visual Acuity, External Approach
4A07X7Z - Measurement of Visual Mobility, External Approach
4A07XBZ - Measurement of Visual Pressure, External Approach
4A08X0Z - Measurement of Olfactory Acuity, External Approach
4A0971Z - Measurement of Respiratory Capacity, Via Natural or Artificial Opening
4A0975Z - Measurement of Respiratory Flow, Via Natural or Artificial Opening
4A097CZ - Measurement of Respiratory Rate, Via Natural or Artificial Opening
4A097DZ - Measurement of Respiratory Resistance, Via Natural or Artificial Opening
4A097LZ - Measurement of Respiratory Volume, Via Natural or Artificial Opening
4A097MZ - Measurement of Respiratory Total Activity, Via Natural or Artificial Opening
4A0981Z - Measurement of Respiratory Capacity, Via Natural or Artificial Opening Endoscopic
4A0985Z - Measurement of Respiratory Flow, Via Natural or Artificial Opening Endoscopic
4A098CZ - Measurement of Respiratory Rate, Via Natural or Artificial Opening Endoscopic
4A098DZ - Measurement of Respiratory Resistance, Via Natural or Artificial Opening Endoscopic
4A098LZ - Measurement of Respiratory Volume, Via Natural or Artificial Opening Endoscopic
4A098MZ - Measurement of Respiratory Total Activity, Via Natural or Artificial Opening Endoscopic
4A09X1Z - Measurement of Respiratory Capacity, External Approach
4A09X5Z - Measurement of Respiratory Flow, External Approach
4A09XCZ - Measurement of Respiratory Rate, External Approach
4A09XDZ - Measurement of Respiratory Resistance, External Approach
4A09XLZ - Measurement of Respiratory Volume, External Approach
4A09XMZ - Measurement of Respiratory Total Activity, External Approach
4A0B78Z - Measurement of Gastrointestinal Motility, Via Natural or Artificial Opening
4A0B7BZ - Measurement of Gastrointestinal Pressure, Via Natural or Artificial Opening
4A0B7GZ - Measurement of Gastrointestinal Secretion, Via Natural or Artificial Opening
4A0B88Z - Measurement of Gastrointestinal Motility, Via Natural or Artificial Opening Endoscopic
4A0B8BZ - Measurement of Gastrointestinal Pressure, Via Natural or Artificial Opening Endoscopic
4A0B8GZ - Measurement of Gastrointestinal Secretion, Via Natural or Artificial Opening Endoscopic
4A0C35Z - Measurement of Biliary Flow, Percutaneous Approach
4A0C3BZ - Measurement of Biliary Pressure, Percutaneous Approach
4A0C45Z - Measurement of Biliary Flow, Percutaneous Endoscopic Approach
4A0C4BZ - Measurement of Biliary Pressure, Percutaneous Endoscopic Approach
4A0C75Z - Measurement of Biliary Flow, Via Natural or Artificial Opening
4A0C7BZ - Measurement of Biliary Pressure, Via Natural or Artificial Opening
4A0C85Z - Measurement of Biliary Flow, Via Natural or Artificial Opening Endoscopic
4A0C8BZ - Measurement of Biliary Pressure, Via Natural or Artificial Opening Endoscopic
4A0D73Z - Measurement of Urinary Contractility, Via Natural or Artificial Opening
4A0D75Z - Measurement of Urinary Flow, Via Natural or Artificial Opening
4A0D7BZ - Measurement of Urinary Pressure, Via Natural or Artificial Opening
4A0D7DZ - Measurement of Urinary Resistance, Via Natural or Artificial Opening
4A0D7LZ - Measurement of Urinary Volume, Via Natural or Artificial Opening
4A0D83Z - Measurement of Urinary Contractility, Via Natural or Artificial Opening Endoscopic
4A0D85Z - Measurement of Urinary Flow, Via Natural or Artificial Opening Endoscopic
4A0D8BZ - Measurement of Urinary Pressure, Via Natural or Artificial Opening Endoscopic
4A0D8DZ - Measurement of Urinary Resistance, Via Natural or Artificial Opening Endoscopic
4A0D8LZ - Measurement of Urinary Volume, Via Natural or Artificial Opening Endoscopic
4A0F33Z - Measurement of Musculoskeletal Contractility, Percutaneous Approach
4A0F3BE - Measurement of Musculoskeletal Pressure, Compartment, Percutaneous Approach
4A0FX3Z - Measurement of Musculoskeletal Contractility, External Approach
4A0H74Z - Measurement of Products of Conception, Cardiac Electrical Activity, Via Natural or Artificial Opening
4A0H7CZ - Measurement of Products of Conception, Cardiac Rate, Via Natural or Artificial Opening
4A0H7FZ - Measurement of Products of Conception, Cardiac Rhythm, Via Natural or Artificial Opening
4A0H7HZ - Measurement of Products of Conception, Cardiac Sound, Via Natural or Artificial Opening
4A0H84Z - Measurement of Products of Conception, Cardiac Electrical Activity, Via Natural or Artificial Opening Endoscopic
4A0H8CZ - Measurement of Products of Conception, Cardiac Rate, Via Natural or Artificial Opening Endoscopic
4A0H8FZ - Measurement of Products of Conception, Cardiac Rhythm, Via Natural or Artificial Opening Endoscopic
4A0H8HZ - Measurement of Products of Conception, Cardiac Sound, Via Natural or Artificial Opening Endoscopic
4A0HX4Z - Measurement of Products of Conception, Cardiac Electrical Activity, External Approach
4A0HXCZ - Measurement of Products of Conception, Cardiac Rate, External Approach
4A0HXFZ - Measurement of Products of Conception, Cardiac Rhythm, External Approach
4A0HXHZ - Measurement of Products of Conception, Cardiac Sound, External Approach
4A0J72Z - Measurement of Products of Conception, Nervous Conductivity, Via Natural or Artificial Opening
4A0J74Z - Measurement of Products of Conception, Nervous Electrical Activity, Via Natural or Artificial Opening
4A0J7BZ - Measurement of Products of Conception, Nervous Pressure, Via Natural or Artificial Opening
4A0J82Z - Measurement of Products of Conception, Nervous Conductivity, Via Natural or Artificial Opening Endoscopic
4A0J84Z - Measurement of Products of Conception, Nervous Electrical Activity, Via Natural or Artificial Opening Endoscopic
4A0J8BZ - Measurement of Products of Conception, Nervous Pressure, Via Natural or Artificial Opening Endoscopic
4A0JX2Z - Measurement of Products of Conception, Nervous Conductivity, External Approach
4A0JX4Z - Measurement of Products of Conception, Nervous Electrical Activity, External Approach
4A0JXBZ - Measurement of Products of Conception, Nervous Pressure, External Approach
4A0Z76Z - Measurement of Metabolism, Via Natural or Artificial Opening
4A0Z7KZ - Measurement of Temperature, Via Natural or Artificial Opening
4A0ZX6Z - Measurement of Metabolism, External Approach
4A0ZXKZ - Measurement of Temperature, External Approach
4A0ZXQZ - Measurement of Sleep, External Approach
