ICD-10-PCS code structure

Section:
  4 = Measurement and Monitoring

Body System:
  A = Physiological Systems

Root Operation:
  0 = Measurement

Body Part:


See Terms used in Measurement and Monitoring

Select the appropriate procedure code based on the approach & device:

4A00 - Central Nervous

  • Open Approach

    Cutting through the skin or mucous membrane and any other body layers necessary to expose the site of the procedure

    • Conductivity
      • 4A0002Z - Measurement of Central Nervous Conductivity, Open Approach
    • Electrical Activity
      • 4A0004Z - Measurement of CNS Electr Activity, Open Approach
    • Pressure
      • 4A000BZ - Measurement of Central Nervous Pressure, Open Approach

  • Percutaneous Approach

    Entry, by puncture or minor incision, of instrumentation through the skin or mucous membrane and any other body layers necessary to reach the site of the procedure

    • Electrical Activity
      • 4A0034Z - Measurement of CNS Electr Activity, Perc Approach
    • Pressure
      • 4A003BD - Measurement of Intracranial Pressure, Percutaneous Approach
    • Temperature
      • 4A003KD - Measurement of Intracranial Temperature, Perc Approach
    • Saturation
      • 4A003RD - Measurement of Intracranial Saturation, Perc Approach

  • Via Natural or Artificial Opening Approach

    Entry of instrumentation through a natural or artificial external opening to reach the site of the procedure

    • Electrical Activity
      • 4A0074Z - Measurement of Central Nervous Electr Activity, Via Opening
    • Pressure
      • 4A007BD - Measurement of Intracranial Pressure, Via Opening
    • Temperature
      • 4A007KD - Measurement of Intracranial Temperature, Via Opening
    • Saturation
      • 4A007RD - Measurement of Intracranial Saturation, Via Opening

  • Via Natural or Artificial Opening Endoscopic Approach

    Entry of instrumentation through a natural or artificial external opening to reach and visualize the site of the procedure

    • Electrical Activity
      • 4A0084Z - Measurement of Central Nervous Electrical Activity, Endo
    • Pressure
      • 4A008BD - Measurement of Intracranial Pressure, Endo
    • Temperature
      • 4A008KD - Measurement of Intracranial Temperature, Endo
    • Saturation
      • 4A008RD - Measurement of Intracranial Saturation, Endo

  • External Approach

    Procedures performed directly on the skin or mucous membrane and procedures performed indirectly by the application of external force through the skin or mucous membrane

    • Conductivity
      • 4A00X2Z - Measurement of Central Nervous Conductivity, Extern Approach
    • Electrical Activity
      • 4A00X4Z - Measurement of CNS Electr Activity, Extern Approach