E&M stands for Evaluation and Management, the system used to classify and bill for the most common type of healthcare visit: the one where a provider assesses your condition and decides on a plan. Every time you see a doctor for a problem, whether it’s a new symptom, a chronic condition checkup, or an urgent concern, that visit is categorized using an E&M code. These codes determine how much the provider gets paid and how much you or your insurance owe.
E&M codes cover everything from a straightforward office visit for a sore throat to a complex hospital consultation for multiple overlapping conditions. They’re the backbone of medical billing, accounting for the majority of claims submitted to insurers and Medicare.
How E&M Visits Are Classified
Each E&M visit gets assigned a level, typically ranging from 1 (simplest) to 5 (most complex). The level reflects how much clinical work the provider did during the encounter. A higher level means the visit involved more complicated problems, more data to review, or higher-risk decisions, and it pays more.
Providers choose the level based on one of two methods: medical decision making or total time spent on the visit.
Medical Decision Making
Medical decision making (MDM) is the primary way most visits are leveled. It measures three things:
- Number and complexity of problems addressed. A single, straightforward issue like a mild rash ranks lower than managing three chronic conditions at once.
- Amount and complexity of data reviewed. If your provider needs to review lab results, imaging, records from other doctors, or consult with a specialist, that adds complexity.
- Risk of the treatment plan. Prescribing a basic antibiotic carries less risk than starting a medication that requires monitoring for serious side effects, or deciding whether surgery is needed.
The provider evaluates all three elements and the visit level is determined by whichever two of the three elements reach the highest threshold. A visit where your doctor manages your diabetes, reviews recent bloodwork, and adjusts a medication with potential side effects would score higher than a visit for a simple ear infection.
Time-Based Coding
Instead of using medical decision making, providers can base the visit level entirely on total time spent on the date of the encounter. This isn’t just face-to-face time with you. It includes time the provider personally spends reviewing your records, coordinating care, writing orders, and documenting the visit, whether you’re in the room or not.
Time that clinical staff handles (a nurse taking your vitals, for instance) doesn’t count. Neither does time spent on a separate procedure that’s billed on its own. Time-based coding is especially useful for visits that involve extensive counseling or care coordination but don’t necessarily involve complex medical decisions.
New Patient vs. Established Patient
E&M codes distinguish between new and established patients, and the difference matters for billing. A new patient is someone who hasn’t received any professional services from that provider, or another provider in the same group with the same specialty, within the past three years. If you saw a cardiologist in a practice four years ago and return now, you’re classified as new.
An established patient is anyone who has been seen within that three-year window, regardless of whether the current visit is for the same problem or a completely different one. New patient visits are reimbursed at higher rates because they typically require more work to gather history and establish a baseline.
What Changed in 2021 and 2023
E&M coding underwent its biggest overhaul in decades starting January 1, 2021, when revised guidelines took effect for office and outpatient visits. The most significant shift: history-taking and physical exam were removed as factors for choosing the visit level. Previously, providers had to document specific elements of your history and exam to justify a higher-level code, which led to lengthy, formulaic notes that often didn’t reflect the actual clinical thinking involved.
Under the current system, code selection is based exclusively on medical decision making or total time. Providers still take a history and perform an exam as clinically appropriate, but those components no longer drive the billing level. In 2023, emergency department E&M codes were updated to follow the same approach.
The result has been documentation that better reflects what actually happened during the visit rather than a checklist designed to satisfy billing requirements.
The Complexity Add-On Code
Starting January 1, 2024, Medicare began paying for an add-on code (G2211) that recognizes the extra complexity of being a patient’s ongoing, primary provider. When a physician serves as the continuing focal point for all of a patient’s healthcare needs, the relationship itself adds inherent complexity to every visit. Managing a patient’s full picture over time is different from a one-off consultation.
This code can be billed alongside most office visits, though not when the visit is already being billed alongside a same-day procedure. The determining factor is the nature of the ongoing relationship between patient and provider, not the specific problem being addressed that day.
How E&M Relates to Surgical Billing
When you have surgery, the surgeon’s fee typically bundles in related E&M visits before and after the procedure. For minor procedures, the bundle covers E&M services on the day of surgery and for 10 days afterward. For major surgeries, it covers the day before, the day of, and 90 days of follow-up visits.
During these “global periods,” your surgeon generally can’t bill separately for visits related to the surgery. There are exceptions: if you come in during the recovery period for a completely unrelated problem (say, a new respiratory infection after knee surgery), that visit can be billed separately with a special modifier. Similarly, if the office visit where your surgeon first decided you needed the operation was the day before a major surgery, that initial visit can also be billed on its own.
Why Documentation Matters
Every E&M visit must be supported by documentation showing the visit was medically necessary, meaning it was required to diagnose or treat an illness, injury, or condition. Medicare and private insurers audit E&M claims, and reviewers compare the medical record against the billed code to verify accuracy.
If a provider bills a high-level visit but the chart only documents a simple problem with minimal data review and low-risk treatment, the claim can be denied or downgraded. When time is used to select the level, the total time must be documented clearly. Overcoding (billing higher than the work supports) and undercoding (billing lower and leaving reimbursement on the table) are both common problems, which is why E&M coding is one of the most audited areas in healthcare billing.