2025 ICD-10-CM Procedure Code 4A1

Measurement and Monitoring, Physiological Systems, Monitoring

ICD-10-PCS Code:: 4A1
ICD-10-PCS Code for:: Msrmt & Monitor, Physiological Sys, Monitor
Is Billable?: Not Valid for Submission
Code Navigator:

4A1 is a "header" nonspecific and non-billable procedure code used to indicate the performance of measurement and monitoring, physiological systems, monitoring.

Table of Contents

Code Information
PCS Table
Other Similar Codes

4A1 PCS Table

In an PCS table each code is represented by up seven alphanumeric characters, with each character in the table respresenting different aspects of the procedure. In the table provided below, each row represents an individual character and includes information about the character's position, designation, label, and procedure notes. For this PCS table the procedure code is in the measurement and monitoring section and is part of the physiological systems body system, classified under monitoring operation.

Position	Designation	Character	Label	Procedures Notes
1	Section	4	Measurement and Monitoring
2	Body System	A	Physiological Systems
3	Operation	1	Monitoring	Involves: Determining the level of a physiological or physical function repetitively over a period of time

Other ICD-10-PCS Codes Used for Monitoring

Filter related codes list:

4A1002Z Monitoring of Central Nervous Conductivity, Open Approach
4A1004G Monitoring of Central Nervous Electrical Activity, Intraoperative, Open Approach
4A1004Z Monitoring of Central Nervous Electrical Activity, Open Approach
4A100BZ Monitoring of Central Nervous Pressure, Open Approach
4A1034G Monitoring of Central Nervous Electrical Activity, Intraoperative, Percutaneous Approach
4A1034Z Monitoring of Central Nervous Electrical Activity, Percutaneous Approach
4A103BD Monitoring of Intracranial Pressure, Percutaneous Approach
4A103KD Monitoring of Intracranial Temperature, Percutaneous Approach
4A103RD Monitoring of Intracranial Saturation, Percutaneous Approach
4A1074G Monitoring of Central Nervous Electrical Activity, Intraoperative, Via Natural or Artificial Opening
4A1074Z Monitoring of Central Nervous Electrical Activity, Via Natural or Artificial Opening
4A107BD Monitoring of Intracranial Pressure, Via Natural or Artificial Opening
4A107KD Monitoring of Intracranial Temperature, Via Natural or Artificial Opening
4A107RD Monitoring of Intracranial Saturation, Via Natural or Artificial Opening
4A1084G Monitoring of Central Nervous Electrical Activity, Intraoperative, Via Natural or Artificial Opening Endoscopic
4A1084Z Monitoring of Central Nervous Electrical Activity, Via Natural or Artificial Opening Endoscopic
4A108BD Monitoring of Intracranial Pressure, Via Natural or Artificial Opening Endoscopic
4A108KD Monitoring of Intracranial Temperature, Via Natural or Artificial Opening Endoscopic
4A108RD Monitoring of Intracranial Saturation, Via Natural or Artificial Opening Endoscopic
4A10X2Z Monitoring of Central Nervous Conductivity, External Approach
4A10X4G Monitoring of Central Nervous Electrical Activity, Intraoperative, External Approach
4A10X4Z Monitoring of Central Nervous Electrical Activity, External Approach
4A11029 Monitoring of Peripheral Nervous Conductivity, Sensory, Open Approach
4A1102B Monitoring of Peripheral Nervous Conductivity, Motor, Open Approach
4A1104G Monitoring of Peripheral Nervous Electrical Activity, Intraoperative, Open Approach
4A1104Z Monitoring of Peripheral Nervous Electrical Activity, Open Approach
4A11329 Monitoring of Peripheral Nervous Conductivity, Sensory, Percutaneous Approach
4A1132B Monitoring of Peripheral Nervous Conductivity, Motor, Percutaneous Approach
4A1134G Monitoring of Peripheral Nervous Electrical Activity, Intraoperative, Percutaneous Approach
4A1134Z Monitoring of Peripheral Nervous Electrical Activity, Percutaneous Approach
4A11729 Monitoring of Peripheral Nervous Conductivity, Sensory, Via Natural or Artificial Opening
4A1172B Monitoring of Peripheral Nervous Conductivity, Motor, Via Natural or Artificial Opening
4A1174G Monitoring of Peripheral Nervous Electrical Activity, Intraoperative, Via Natural or Artificial Opening
4A1174Z Monitoring of Peripheral Nervous Electrical Activity, Via Natural or Artificial Opening
4A11829 Monitoring of Peripheral Nervous Conductivity, Sensory, Via Natural or Artificial Opening Endoscopic
4A1182B Monitoring of Peripheral Nervous Conductivity, Motor, Via Natural or Artificial Opening Endoscopic
4A1184G Monitoring of Peripheral Nervous Electrical Activity, Intraoperative, Via Natural or Artificial Opening Endoscopic
4A1184Z Monitoring of Peripheral Nervous Electrical Activity, Via Natural or Artificial Opening Endoscopic
4A11X29 Monitoring of Peripheral Nervous Conductivity, Sensory, External Approach
4A11X2B Monitoring of Peripheral Nervous Conductivity, Motor, External Approach
4A11X4G Monitoring of Peripheral Nervous Electrical Activity, Intraoperative, External Approach
4A11X4Z Monitoring of Peripheral Nervous Electrical Activity, External Approach
4A1204Z Monitoring of Cardiac Electrical Activity, Open Approach
4A1209Z Monitoring of Cardiac Output, Open Approach
4A120CZ Monitoring of Cardiac Rate, Open Approach
4A120FZ Monitoring of Cardiac Rhythm, Open Approach
4A120HZ Monitoring of Cardiac Sound, Open Approach
4A1234Z Monitoring of Cardiac Electrical Activity, Percutaneous Approach
4A1239Z Monitoring of Cardiac Output, Percutaneous Approach
4A123CZ Monitoring of Cardiac Rate, Percutaneous Approach
4A123FZ Monitoring of Cardiac Rhythm, Percutaneous Approach
4A123HZ Monitoring of Cardiac Sound, Percutaneous Approach
4A1274Z Monitoring of Cardiac Electrical Activity, Via Natural or Artificial Opening
4A1279Z Monitoring of Cardiac Output, Via Natural or Artificial Opening
4A127CZ Monitoring of Cardiac Rate, Via Natural or Artificial Opening
4A127FZ Monitoring of Cardiac Rhythm, Via Natural or Artificial Opening
4A127HZ Monitoring of Cardiac Sound, Via Natural or Artificial Opening
4A1284Z Monitoring of Cardiac Electrical Activity, Via Natural or Artificial Opening Endoscopic
4A1289Z Monitoring of Cardiac Output, Via Natural or Artificial Opening Endoscopic
4A128CZ Monitoring of Cardiac Rate, Via Natural or Artificial Opening Endoscopic
4A128FZ Monitoring of Cardiac Rhythm, Via Natural or Artificial Opening Endoscopic
4A128HZ Monitoring of Cardiac Sound, Via Natural or Artificial Opening Endoscopic
4A12X45 Monitoring of Cardiac Electrical Activity, Ambulatory, External Approach
4A12X4Z Monitoring of Cardiac Electrical Activity, External Approach
4A12X9Z Monitoring of Cardiac Output, External Approach
4A12XCZ Monitoring of Cardiac Rate, External Approach
4A12XFZ Monitoring of Cardiac Rhythm, External Approach
4A12XHZ Monitoring of Cardiac Sound, External Approach
4A12XM4 Monitoring of Cardiac Stress, External Approach
4A12XSH Monitoring of Cardiac Vascular Perfusion using Indocyanine Green Dye, External Approach
4A13051 Monitoring of Arterial Flow, Peripheral, Open Approach
4A13053 Monitoring of Arterial Flow, Pulmonary, Open Approach
4A1305C Monitoring of Arterial Flow, Coronary, Open Approach
4A130B1 Monitoring of Arterial Pressure, Peripheral, Open Approach
4A130B3 Monitoring of Arterial Pressure, Pulmonary, Open Approach
4A130BC Monitoring of Arterial Pressure, Coronary, Open Approach
4A130H1 Monitoring of Arterial Sound, Peripheral, Open Approach
4A130J1 Monitoring of Arterial Pulse, Peripheral, Open Approach
4A130J3 Monitoring of Arterial Pulse, Pulmonary, Open Approach
4A130JC Monitoring of Arterial Pulse, Coronary, Open Approach
4A130R1 Monitoring of Arterial Saturation, Peripheral, Open Approach
4A13351 Monitoring of Arterial Flow, Peripheral, Percutaneous Approach
4A13353 Monitoring of Arterial Flow, Pulmonary, Percutaneous Approach
4A1335C Monitoring of Arterial Flow, Coronary, Percutaneous Approach
4A133B1 Monitoring of Arterial Pressure, Peripheral, Percutaneous Approach
4A133B3 Monitoring of Arterial Pressure, Pulmonary, Percutaneous Approach
4A133BC Monitoring of Arterial Pressure, Coronary, Percutaneous Approach
4A133H1 Monitoring of Arterial Sound, Peripheral, Percutaneous Approach
4A133J1 Monitoring of Arterial Pulse, Peripheral, Percutaneous Approach
4A133J3 Monitoring of Arterial Pulse, Pulmonary, Percutaneous Approach
4A133JC Monitoring of Arterial Pulse, Coronary, Percutaneous Approach
4A133R1 Monitoring of Arterial Saturation, Peripheral, Percutaneous Approach
4A13X51 Monitoring of Arterial Flow, Peripheral, External Approach
4A13XB1 Monitoring of Arterial Pressure, Peripheral, External Approach
4A13XH1 Monitoring of Arterial Sound, Peripheral, External Approach
4A13XJ1 Monitoring of Arterial Pulse, Peripheral, External Approach
4A13XR1 Monitoring of Arterial Saturation, Peripheral, External Approach
4A14050 Monitoring of Venous Flow, Central, Open Approach
4A14051 Monitoring of Venous Flow, Peripheral, Open Approach
4A14052 Monitoring of Venous Flow, Portal, Open Approach
4A14053 Monitoring of Venous Flow, Pulmonary, Open Approach
4A140B0 Monitoring of Venous Pressure, Central, Open Approach
4A140B1 Monitoring of Venous Pressure, Peripheral, Open Approach
4A140B2 Monitoring of Venous Pressure, Portal, Open Approach
4A140B3 Monitoring of Venous Pressure, Pulmonary, Open Approach
4A140J0 Monitoring of Venous Pulse, Central, Open Approach
4A140J1 Monitoring of Venous Pulse, Peripheral, Open Approach
4A140J2 Monitoring of Venous Pulse, Portal, Open Approach
4A140J3 Monitoring of Venous Pulse, Pulmonary, Open Approach
4A140R0 Monitoring of Venous Saturation, Central, Open Approach
4A140R2 Monitoring of Venous Saturation, Portal, Open Approach
4A140R3 Monitoring of Venous Saturation, Pulmonary, Open Approach
4A14350 Monitoring of Venous Flow, Central, Percutaneous Approach
4A14351 Monitoring of Venous Flow, Peripheral, Percutaneous Approach
4A14352 Monitoring of Venous Flow, Portal, Percutaneous Approach
4A14353 Monitoring of Venous Flow, Pulmonary, Percutaneous Approach
4A143B0 Monitoring of Venous Pressure, Central, Percutaneous Approach
4A143B1 Monitoring of Venous Pressure, Peripheral, Percutaneous Approach
4A143B2 Monitoring of Venous Pressure, Portal, Percutaneous Approach
4A143B3 Monitoring of Venous Pressure, Pulmonary, Percutaneous Approach
4A143J0 Monitoring of Venous Pulse, Central, Percutaneous Approach
4A143J1 Monitoring of Venous Pulse, Peripheral, Percutaneous Approach
4A143J2 Monitoring of Venous Pulse, Portal, Percutaneous Approach
4A143J3 Monitoring of Venous Pulse, Pulmonary, Percutaneous Approach
4A143R0 Monitoring of Venous Saturation, Central, Percutaneous Approach
4A143R2 Monitoring of Venous Saturation, Portal, Percutaneous Approach
4A143R3 Monitoring of Venous Saturation, Pulmonary, Percutaneous Approach
4A14X51 Monitoring of Venous Flow, Peripheral, External Approach
4A14XB1 Monitoring of Venous Pressure, Peripheral, External Approach
4A14XJ1 Monitoring of Venous Pulse, Peripheral, External Approach
4A1605H Monitoring of Lymphatic Flow using Indocyanine Green Dye, Open Approach
4A1605Z Monitoring of Lymphatic Flow, Open Approach
4A160BZ Monitoring of Lymphatic Pressure, Open Approach
4A1635H Monitoring of Lymphatic Flow using Indocyanine Green Dye, Percutaneous Approach
4A1635Z Monitoring of Lymphatic Flow, Percutaneous Approach
4A163BZ Monitoring of Lymphatic Pressure, Percutaneous Approach
4A1675H Monitoring of Lymphatic Flow using Indocyanine Green Dye, Via Natural or Artificial Opening
4A1675Z Monitoring of Lymphatic Flow, Via Natural or Artificial Opening
4A167BZ Monitoring of Lymphatic Pressure, Via Natural or Artificial Opening
4A1685H Monitoring of Lymphatic Flow using Indocyanine Green Dye, Via Natural or Artificial Opening Endoscopic
4A1685Z Monitoring of Lymphatic Flow, Via Natural or Artificial Opening Endoscopic
4A168BZ Monitoring of Lymphatic Pressure, Via Natural or Artificial Opening Endoscopic
4A1971Z Monitoring of Respiratory Capacity, Via Natural or Artificial Opening
4A1975Z Monitoring of Respiratory Flow, Via Natural or Artificial Opening
4A197CZ Monitoring of Respiratory Rate, Via Natural or Artificial Opening
4A197DZ Monitoring of Respiratory Resistance, Via Natural or Artificial Opening
4A197LZ Monitoring of Respiratory Volume, Via Natural or Artificial Opening
4A19X1Z Monitoring of Respiratory Capacity, External Approach
4A19X5Z Monitoring of Respiratory Flow, External Approach
4A19XCZ Monitoring of Respiratory Rate, External Approach
4A19XDZ Monitoring of Respiratory Resistance, External Approach
4A19XLZ Monitoring of Respiratory Volume, External Approach
4A1B78Z Monitoring of Gastrointestinal Motility, Via Natural or Artificial Opening
4A1B7BZ Monitoring of Gastrointestinal Pressure, Via Natural or Artificial Opening
4A1B7GZ Monitoring of Gastrointestinal Secretion, Via Natural or Artificial Opening
4A1B88Z Monitoring of Gastrointestinal Motility, Via Natural or Artificial Opening Endoscopic
4A1B8BZ Monitoring of Gastrointestinal Pressure, Via Natural or Artificial Opening Endoscopic
4A1B8GZ Monitoring of Gastrointestinal Secretion, Via Natural or Artificial Opening Endoscopic
4A1BXSH Monitoring of Gastrointestinal Vascular Perfusion using Indocyanine Green Dye, External Approach
4A1D73Z Monitoring of Urinary Contractility, Via Natural or Artificial Opening
4A1D75Z Monitoring of Urinary Flow, Via Natural or Artificial Opening
4A1D7BZ Monitoring of Urinary Pressure, Via Natural or Artificial Opening
4A1D7DZ Monitoring of Urinary Resistance, Via Natural or Artificial Opening
4A1D7LZ Monitoring of Urinary Volume, Via Natural or Artificial Opening
4A1D83Z Monitoring of Urinary Contractility, Via Natural or Artificial Opening Endoscopic
4A1D85Z Monitoring of Urinary Flow, Via Natural or Artificial Opening Endoscopic
4A1D8BZ Monitoring of Urinary Pressure, Via Natural or Artificial Opening Endoscopic
4A1D8DZ Monitoring of Urinary Resistance, Via Natural or Artificial Opening Endoscopic
4A1D8LZ Monitoring of Urinary Volume, Via Natural or Artificial Opening Endoscopic
4A1GXSH Monitoring of Skin and Breast Vascular Perfusion using Indocyanine Green Dye, External Approach
4A1H74Z Monitoring of Products of Conception, Cardiac Electrical Activity, Via Natural or Artificial Opening
4A1H7CZ Monitoring of Products of Conception, Cardiac Rate, Via Natural or Artificial Opening
4A1H7FZ Monitoring of Products of Conception, Cardiac Rhythm, Via Natural or Artificial Opening
4A1H7HZ Monitoring of Products of Conception, Cardiac Sound, Via Natural or Artificial Opening
4A1H84Z Monitoring of Products of Conception, Cardiac Electrical Activity, Via Natural or Artificial Opening Endoscopic
4A1H8CZ Monitoring of Products of Conception, Cardiac Rate, Via Natural or Artificial Opening Endoscopic
4A1H8FZ Monitoring of Products of Conception, Cardiac Rhythm, Via Natural or Artificial Opening Endoscopic
4A1H8HZ Monitoring of Products of Conception, Cardiac Sound, Via Natural or Artificial Opening Endoscopic
4A1HX4Z Monitoring of Products of Conception, Cardiac Electrical Activity, External Approach
4A1HXCZ Monitoring of Products of Conception, Cardiac Rate, External Approach
4A1HXFZ Monitoring of Products of Conception, Cardiac Rhythm, External Approach
4A1HXHZ Monitoring of Products of Conception, Cardiac Sound, External Approach
4A1J72Z Monitoring of Products of Conception, Nervous Conductivity, Via Natural or Artificial Opening
4A1J74Z Monitoring of Products of Conception, Nervous Electrical Activity, Via Natural or Artificial Opening
4A1J7BZ Monitoring of Products of Conception, Nervous Pressure, Via Natural or Artificial Opening
4A1J82Z Monitoring of Products of Conception, Nervous Conductivity, Via Natural or Artificial Opening Endoscopic
4A1J84Z Monitoring of Products of Conception, Nervous Electrical Activity, Via Natural or Artificial Opening Endoscopic
4A1J8BZ Monitoring of Products of Conception, Nervous Pressure, Via Natural or Artificial Opening Endoscopic
4A1JX2Z Monitoring of Products of Conception, Nervous Conductivity, External Approach
4A1JX4Z Monitoring of Products of Conception, Nervous Electrical Activity, External Approach
4A1JXBZ Monitoring of Products of Conception, Nervous Pressure, External Approach
4A1Z7KZ Monitoring of Temperature, Via Natural or Artificial Opening
4A1ZXKZ Monitoring of Temperature, External Approach
4A1ZXQZ Monitoring of Sleep, External Approach

What is ICD-10-PCS?

The ICD-10 Procedure Coding System (ICD-10-PCS) is a catalog of procedural codes used by medical professionals for hospital inpatient healthcare settings. The Centers for Medicare and Medicaid Services (CMS) maintain the catalog in the U.S. releasing yearly updates. The 2025 ICD-10-PCS codes are to be used for discharges occurring from October 1, 2024 through September 30, 2025.

Each ICD-10-PCS code has a structure of seven alphanumeric characters and contains no decimals. The first character defines the major "section". Depending on the "section" the second through seventh characters mean different things.