Neck and abdomen are body areas not systems except there are times the provider will check the lymphatic system when checking the neck and will mention they checked the Lymph glands or states "no masses", etc. I then count it as Hematologic/Lymphatic/Immunologic.
Also, when they are checking the abdomen and mention bowel sounds, etc. the they are checking the Gastrointestinal System.
The thing to really watch is extremities. Unless they mention about their joints, muscles, etc. or state "no clubbing", you have to be careful with this area. If you are coding using the body areas, the provider also has to be specific that they reviewed or examined both upper and lower limbs or total right or left side. If they are specific you can only give them credit for arms or legs or right or left.
Also HEENT - The provider may list HEENT on his/her note but only review or examine the eyes or only the ears, nose and throat but not both. They only get credit for one or the other if both are not noted as being reviewed / examined.
I hope this helps. Best of luck.
Lorri Tolliver, CPC, CPMA, CEMC