Evaluation and Management (E&M) Codes

Evaluation and Management (E&M) codes are the CPT codes used to bill for a physician's or other qualified healthcare provider's time spent evaluating a patient's condition and managing their care. E&M codes cover office visits, hospital rounds, consultations, and preventive-medicine visits — essentially anything that doesn't involve a procedure or diagnostic test but does involve the provider's clinical judgment.

E&M codes are the workhorse of physician billing and also the most audited category in medical billing. The codes range from level 1 (very brief, straightforward) to level 5 (extensive, complex, high medical decision-making), with the level driven historically by three elements: history taking, examination, and medical decision-making. A 2021 CPT update simplified the office-visit E&M coding rules to focus primarily on medical decision-making or total time — a shift that reduced the paperwork burden on physicians. Level 3 (CPT 99213 established patient, 99203 new patient) is the most common code for a routine office visit; level 4 (99214 / 99204) is common when the visit is more complex or the physician spends more time. Upcoding — billing a level 4 visit when the encounter really only supported a level 3 — is one of the most common types of billing error and a frequent audit target for CMS, private carriers, and self-insured plan sponsors.

The takeaway: when reviewing an EOB or bill for a physician visit, check the CPT code (99201-99205 for new patients, 99211-99215 for established patients). A level 4 or 5 visit for a routine follow-up is worth questioning.