Can you help with my Reimbursement methodologies class? part of medical billing and coding. APA format w/ references

Review each of the four components of the revenue cycle (Preclaims, Claims, Accounts Receivable, and Claims, reconciliation and collections) and identify a key staff member involved in each of the four components. Where is the health information professional involved? In all of the components? A few? 

Consider different healthcare environments when developing your response. Are the key staff members the same? Different? Support your answer.