According to the notes preceding the Category III codes in the CPT manual, the digits of the Category III codes are not intended to reflect the placement of the code in the Category I section of the CPT:

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The notes preceding the Category III codes in the CPT manual state that the digits of the Category III codes do not reflect the placement of the code in the Category I section. This refers to the nomenclature, or naming convention, of the Category III codes.

According to the Notes Preceding the Category III Codes in the CPT