Segmental and Somatic Dysfunction of the head region is designated by which code?

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This question tests region-based coding for segmental and somatic dysfunction. In this coding system, the M99.0x family uses the digits after the decimal to specify the body region affected. The head region is represented by the base code M99.00, which indicates segmental and somatic dysfunction located in the head without further regional subdivision. The other decimal forms (01, 02, 04) point to different regions or more specific subregions, which would not apply to the head. Therefore, the correct code for segmental and somatic dysfunction of the head region is M99.00.