The 2nd character defines the particular body system or general physiological system or anatomical region involved.
Chiropractic section procedure codes have a first character value of “9”. The second character value for body system is anatomical regions. There is only one root operation in the chiropractic section.
The fourth character specifies the body region on which the chiropractic manipulation is performed. The approach for chiropractic manipulation is always External. The sixth character is the method by which the manipulation is accomplished. The seventh character is not specified in the chiropractic section, and always has the value No Qualifier.