One of 34 possible Values can be assigned to each axis of classification in the seven-character code.
This question is taken from Conventions in ICD-10-PCS Official Guidelines for Coding and Reporting.
According to the convention A2 in the guidelines, One of 34 possible values can be assigned to each axis of classification in the seven-character code.
They are the numbers 0 to 9 and all the alphabets with the exception of I and O.
An example is where the fifth axis of classification specifies the approach, seven different approach values are currently used to specify the approach.
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