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The process of constructing codes in ICD-10-PCS is designed to be logical and consistent: individual letters and numbers called “values” are selected in sequence to occupy the seven spaces of the code, called “characters.” 

In ICD-10-PCS sections 0 through F, the fourth character defines the body part, body system, body region, or treatment site – i.e., the specific anatomical site where the procedure or service is performed. For sections G (Mental Health) and H (Substance Abuse Treatment), the fourth character defines a specific qualifier.

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