Physician here. Medicare/Medicaid is tied to really arcane and often inane rules. You must document X of this and Y of that and word it in a specific way to get paid. What you actually do for the patient does not always matter but the way you document it makes a big difference. EMR has made it easier to conform to the rules and makes sure you write notes that can be easily billed for. It has simplified documenting for things that are tedious to do on paper (like review of systems, and counseling).