Medicare charting newbie, need info

I am new to LTC and really starting to it! However, I have the medicare hall, and I am wanting to make sure I'm hitting all the bases. We have a checklist type thing on the front with all of the info from the assessment, vitals for each shift at the top, and the res. ability to perform ADLs that we grade with numbers. All of these criteria for day, evening, and night, and then on the back we write a narrative. The back is split into three boxes as well, for day, evening and night. However, I have had no education on medicare. The training I've gotten from the facility is to chart on their diagnosis and their ability to perform adls. I would really like more information. Could anyone suggest any websites or books, anything really, that would clearly explain to me what needs to get posted so that we are properly reimbursed? (and, of course, so I don't look like a moron?) TIA!!