E/M level of service

Evaluation and management (E/M) codes are organized into categories based on care setting—office, hospital inpatient, emergency department, skilled nursing facility, and others—and within each category, visits are stratified by level of complexity. For outpatient office visits, levels run from 1 (minimal) to 5 (high complexity), with each level mapped to a specific CPT code: 99211–99215 for established patients and 99202–99205 for new patients. The higher the level, the greater the expected reimbursement. Whether a visit qualifies for a given level is determined by one of two pathways: the complexity of medical decision-making (MDM) or the total time the clinician personally spends on that patient's care on the date of the encounter—including documentation, ordering, and care coordination, not just face-to-face time.

The landmark 2021 CPT guideline revision eliminated history and physical examination bullet counts as determinants of level selection. MDM is now evaluated across three dimensions: the number and complexity of problems addressed, the volume and complexity of data reviewed and analyzed, and the risk associated with the management options considered. The overall MDM level is set by whichever two of those three elements converge at the same tier—a concept sometimes called the 'two-of-three' rule. For most orthopedic visits, MDM is the more defensible pathway because it directly reflects surgical planning, post-operative management, and complex musculoskeletal decision-making rather than documentation volume.

New versus established patient status also affects which code set applies. A patient is considered new if no professional services have been rendered by the same physician, a same-specialty partner, or another clinician of the same specialty within the same group in the prior three years. This distinction matters because new-patient codes (99202–99205) carry different RVU weights than established-patient codes (99211–99215), even at equivalent complexity levels. Correct patient-status classification at check-in is a prerequisite for accurate level-of-service selection.

Selecting the wrong E/M level has direct revenue and compliance consequences. Upcoding—billing a level higher than documentation supports—exposes the practice to payer audits, CERT scrutiny, and repayment demands; CPT 99223 (highest-level initial hospital care) carried a 24.1% improper payment rate in one CMS review period, representing roughly $433 million in a single year. Downcoding leaves reimbursement on the table: a practice consistently billing level 3 when MDM supports level 4 forfeits the incremental RVU difference on every such encounter. Post-2021 data show a statistically significant, sustained shift toward higher coding levels across orthopedic practices once the history-and-physical requirement was removed—suggesting that many visits were previously undercoded when documentation burden rather than clinical complexity drove level selection.