The E/M Coding Calculator is a resource designed to assist providers with appropriate code selection for evaluation and management services. This tool is a simplified version of the Novitas auditor’s instructions and can be used as a guide to understand the evaluation and management coding and documentation guidelines. Page one includes a snapshot of the levels of service used in the outpatient care setting and their documentation requirements. Page one also includes time thresholds for each level of E/M service and the specific documentation requirements for time-based billing. Page two includes the formula for calculating history, exam, and medical-decision-making along with a table outlining the differences between body areas and organ systems, which is particularly important when calculating physical exam.