A practice manager runs reports on services billed to Medicare. The reports identify a large number of surgical services reported with modifier 22. As a result, you are hired as an external auditor to review the services identified in the report. What type of audit would you perform?
a. A focused audit on surgical services with modifier 22
b. A peer review audit on all surgical services
c. A random audit of all surgical services performed. d. A focused audit on E/M services.