Can someone explain OASIS to me? Simply what does it mean?

Understanding it and getting it right, especially the ICD9 coding part and the MO questions that govern payment, is crucial for reimbursement. The CMS website can be very helpful, as can someone in your agency who knows the ins and outs and can help guide you. It takes time to understand it--it doesn't happen overnight.

would someone please tell me where I can take a course on Oasis

Hi! I know you are going to love HH! OASIS is the acronym for the Outcome ASssessment Information data Set which is a document designed through rigorous research and analysis to measure changes in a patient’s outcomes and risk factors between two or more points. Data items address socioeconomic, environmental, support system, health status, functional status, and health service utilization measured at the start of care, 60 day follow-ups, discharge, resumptions after inpatient stay, significant changes in condition, and transfers. The information obtained provides agencies information for quality improvement and as the information is posted online and compared with national data it also provides potential patients with information to make an informed decision on the quality of providers. The performance of the agency determines the CMS payment rate as agencies unable to meet quality standards receive a lower percentage payment on Medicare reimbursement.
I hope this helps explain Oasis. It is really just a data collection method to measure patient changes in function, clinical, therapy utilization, and early or late episode (60 day period of services).
greeneyesrn http://www.cms.hhs.gov/OASIS/046_DataSet.asp#TopOfPage

More charting, In the simplest of terms it's a PITA!