The ICD-10-PCS root operation Table 4A0 classifies procedures and tests that involve measurement, which is defined in ICD-10-PCS as determining the level of a physiological or physical function at a certain point in time.

An ICD-10-PCS code is derived by choosing a specific value for each of the seven characters in the root operation table. Coding specialists must be cautious, however, because the same value placed in a different position in the code would denote something entirely different (i.e. the value “3” in the first character means something different than “3” in the second character or “3” in the third character, and so on). Each charac­ter in the seven-character code represents an aspect of a procedure, as shown in the ICD-10-PCS Table 4A0, which is provided below:

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