Any input will be greatly appreciated.

Body areas are like head, neck, chest, abdomen, back, extremity, etc.

The organ systems are constitutional, eyes, ENT, respiratory(lungs), cardiovascular, digestive, genitourinary, integumentary(skin), musculoskeletal, neurological, psychiatric.  If the item listed does not fall into one of these system categories, it is a body area and can be counted only in all cases, unless you are assigning a comprehensive exam under the 1995 E/M guidelines.  Then the 8 that you count must be systems only.