The 2021 E/M rules, translated for a practice of one

How does the 2021 E/M MDM table actually work?

An office or outpatient E/M visit is coded by one of two paths: the level of medical decision making, or the total time you personally spend on the date of the encounter. History and exam still get performed and documented as clinically appropriate, but since 2021 they no longer set the level. Medical decision making has three elements, and you land on a level, straightforward through high, by meeting at least two of the three.

The practical translation for a practice of one is that the note no longer earns a level by piling up a review of systems and exam bullets. It earns the level by showing how hard the thinking was: how many and how complex the problems were, how much data you had to gather and weigh, and how much risk the plan carried. The MDM level then maps to a code, and time is an independent alternative you can use whenever the clock supports a higher level than the decision making does.

The sections below take the three MDM elements one at a time in plain language, then the time method, then how to choose between them and code the visit honestly when there is no coder standing between your note and the claim.

What changed in 2021: history and exam stopped setting the level

The 2021 revision to the office and outpatient E/M codes removed history and physical exam as the elements that determine the level, and replaced them with a choice between medical decision making and total time 1Ref 1American Medical Association (2023).CPT evaluation and management (E/M) revisions.That the 2021 AMA E/M revisions eliminated history and exam as level-setting elements for office and outpatient visits in favor of medical decision making or total time, and that the AMA publishes the MDM table and the per-level total-time ranges.. You still take an appropriate history and perform a medically necessary exam, and you still document them, but their volume no longer drives the code. That ended the era of documenting a comprehensive review of systems to justify a level the visit did not otherwise support.

The operative rules for this now live in two places worth knowing by name. The AMA maintains the MDM table and the office-visit code definitions, and CMS restates how Medicare applies them, including what each element means and what has to be documented, in its Evaluation and Management Services Guide 2Ref 2Centers for Medicare & Medicaid Services (2023).Evaluation and Management Services Guide.That office-visit levels are selected by medical decision making or total time under the 2021 framework, that MDM is scored on the three elements with the overall level set by at least two of the three, and what each element and its levels mean and require in the documentation.. When a payer questions a level, those are the references that settle it, not a billing service's summary of them. Because the same framework applies to new and established patients, the mechanics below are identical across both, and only the code numbers differ.

The three elements and the two-of-three rule

Medical decision making is scored on three elements, and the overall MDM level is the one that at least two of the three reach 2Ref 2Centers for Medicare & Medicaid Services (2023).Evaluation and Management Services Guide.That office-visit levels are selected by medical decision making or total time under the 2021 framework, that MDM is scored on the three elements with the overall level set by at least two of the three, and what each element and its levels mean and require in the documentation.. The three are the number and complexity of problems addressed at the encounter, the amount and complexity of data reviewed and analyzed, and the risk of complications or morbidity from the management chosen. Each element has four levels of its own, and the visit's level is where two of them meet or exceed.

The MDM level then maps directly to a code:

One code sits outside the table: 99211 is an established-patient visit at a minimal level that may not require the billing provider's presence, and it carries no MDM or time threshold. The two-of-three rule is the single most useful thing to internalize, because it means a visit does not need every element to be high to reach a level; it needs two. A moderate problem plus moderate risk reaches 99214 even if the data element is low, which is why the everyday 99213 vs 99214 question usually comes down to whether two elements clear moderate.

Element one: the problems you addressed

The first element counts the number and complexity of the problems you actually addressed at the visit, not every diagnosis in the chart. A single self-limited or minor problem is minimal. Two or more minor problems, or one stable chronic illness, or one acute uncomplicated illness or injury, is low. The line most solos care about is moderate, which is where 99214 lives.

Addressed means you evaluated or managed it, and it is documented with the specific ICD-10-CM diagnoses that support the visit, since ICD-10-CM is the annually updated code set the problem list is built from 3Ref 3Centers for Medicare & Medicaid Services (2026).ICD-10 Codes.That ICD-10-CM is the HIPAA-mandated, annually updated diagnosis code set, so the problems addressed in the first MDM element are documented with specific current diagnoses that support the visit.. The levels read like this:

• Moderate: one or more chronic illnesses with exacerbation, progression, or side effects; or two or more stable chronic illnesses; or an undiagnosed new problem with an uncertain prognosis; or an acute illness with systemic symptoms; or an acute complicated injury.
• High: one or more chronic illnesses with severe exacerbation or side effects of treatment; or an acute or chronic illness or injury that poses a threat to life or to bodily function.

Coding the problems specifically matters twice: it supports the level, and it feeds the medical-necessity picture a payer reads. A vague diagnosis undersells a complex visit.

Element two: the data you reviewed and analyzed

The second element scores how much data you had to gather, review, and weigh, and it is organized into three categories 2Ref 2Centers for Medicare & Medicaid Services (2023).Evaluation and Management Services Guide.That office-visit levels are selected by medical decision making or total time under the 2021 framework, that MDM is scored on the three elements with the overall level set by at least two of the three, and what each element and its levels mean and require in the documentation.. The more categories you engage, and the more you do within them, the higher the data level, which is why this element is the one most often left on the table by a note that did the work but never recorded it.

The three categories are worth knowing plainly:

• Category one: tests, documents, and independent historians. This covers reviewing prior external notes, reviewing each unique test result, ordering each unique test, and getting history from someone other than the patient when the patient cannot give a reliable one.
• Category two: independently interpreting a test that someone else performed, when you are not separately billing for that interpretation.
• Category three: discussing the patient's management or a test result with an external physician or other qualified professional.

A limited amount of category-one work is low data; a specified combination across the categories, or an independent interpretation, or an outside discussion, moves it to moderate; extensive data across categories is high. The rule of thumb for a solo is that ordering and reviewing outside records is real data that only counts if the note says you did it.

Element three: risk, where prescription drug management lives

The third element is the risk of complications or morbidity from the diagnostic testing and treatment you chose, and it is often the element that decides a level 2Ref 2Centers for Medicare & Medicaid Services (2023).Evaluation and Management Services Guide.That office-visit levels are selected by medical decision making or total time under the 2021 framework, that MDM is scored on the three elements with the overall level set by at least two of the three, and what each element and its levels mean and require in the documentation.. Over-the-counter management is low risk. The threshold most visits turn on is moderate, and the clearest moderate-risk example is prescription drug management: deciding to start, continue, or adjust a prescription medication is moderate risk, and it is the most common honest path to 99214.

The high tier is genuinely high-stakes management:

• Moderate risk: prescription drug management; a decision about minor surgery with patient or procedure risk factors; or management significantly limited by a patient's social circumstances.
• High risk: drug therapy that requires intensive monitoring for toxicity; a decision about hospitalization; a decision about emergency surgery; or a decision to de-escalate care because of a poor prognosis.

Because risk is one of the three elements and 99214 needs two of them at moderate, prescription drug management plus a moderate problem is the everyday combination that supports a level-four visit. Documenting the medication decision, including the reasoning, is what makes that risk level legible to a reviewer rather than assumed.

The time method: what counts, and the ranges

Time is the independent alternative to MDM, and under the 2021 rules it is the total time you personally spend on the date of the encounter, not just the face-to-face minutes 1Ref 1American Medical Association (2023).CPT evaluation and management (E/M) revisions.That the 2021 AMA E/M revisions eliminated history and exam as level-setting elements for office and outpatient visits in favor of medical decision making or total time, and that the AMA publishes the MDM table and the per-level total-time ranges.. That total includes the non-face-to-face work you do that day: reviewing records before the visit, ordering tests and medications, counseling, documenting in the chart, and coordinating care that is not separately billed. It excludes time spent by your clinical staff, and time on any other date.

The AMA publishes a total-time range for each level 1Ref 1American Medical Association (2023).CPT evaluation and management (E/M) revisions.That the 2021 AMA E/M revisions eliminated history and exam as level-setting elements for office and outpatient visits in favor of medical decision making or total time, and that the AMA publishes the MDM table and the per-level total-time ranges.2Ref 2Centers for Medicare & Medicaid Services (2023).Evaluation and Management Services Guide.That office-visit levels are selected by medical decision making or total time under the 2021 framework, that MDM is scored on the three elements with the overall level set by at least two of the three, and what each element and its levels mean and require in the documentation.:

To bill by time, the note has to state the total time and, as a practical matter, what you did with it. Time is the cleaner path for a visit that was cognitively light but genuinely long, such as an extended counseling encounter, where MDM would undersell the work but the clock captures it.

Choosing time or MDM, prolonged services, and what the level pays

You may select the code by whichever method, MDM or time, supports the higher level, and you do not have to use the same method on every visit 2Ref 2Centers for Medicare & Medicaid Services (2023).Evaluation and Management Services Guide.That office-visit levels are selected by medical decision making or total time under the 2021 framework, that MDM is scored on the three elements with the overall level set by at least two of the three, and what each element and its levels mean and require in the documentation.. The discipline is to pick per encounter and document to support the method you chose: if you billed on MDM, the two qualifying elements have to be legible in the note; if you billed on time, the total time has to be stated.

Choosing the more favorable of the two honestly, visit by visit, is not upcoding; it is using the rule as written.

When a visit runs past the top time range, prolonged-services coding begins, and here Medicare and the AMA diverge: the AMA created 99417 for each additional increment of time beyond 99205 or 99215, while Medicare recognizes its own prolonged code instead. The mechanics of 99417 prolonged services and the Medicare equivalent are enough of their own topic to keep separate. What the level is worth is not a fixed dollar figure to memorize: the code drives the relative value units, and you can look up your locality's payment amount for any code in the Medicare Physician Fee Schedule search tool 4Ref 4Centers for Medicare & Medicaid Services (2026).Physician Fee Schedule Search.That CMS publishes a public Physician Fee Schedule look-up tool where any clinician can find the national and locality payment amount and RVUs for a CPT code, so the payment difference between E/M levels is looked up rather than stated as a fixed figure.. The gap between a 99213 and a 99214 across a full panel is large enough that consistent undercoding is a real, quiet loss.

E/M in a practice of one: who bills it, and coding it honestly

Not everyone in a solo behavioral or primary-care practice bills office E/M. The office visit codes belong to prescribers and medical providers; therapists and counselors bill the psychotherapy codes — 90832, 90834, 90837 — and the psychiatric diagnostic evaluation, not E/M 5Ref 5American Medical Association (2026).CPT® (Current Procedural Terminology).That CPT, including the office E/M codes and the psychotherapy codes, is maintained by the AMA and updated annually, so the definitions are re-checked each year, and that E/M and psychotherapy are distinct code families..

A prescriber doing medication management bills the E/M visit and can add a psychotherapy add-on when both services are delivered and documented, which is why the solo prescriber's schedule mixes the two families in a way a therapy-only schedule never does. Medicare's mental-health guidance lists which provider types may bill which codes 6Ref 6Centers for Medicare & Medicaid Services (2025).Medicare and Mental Health Coverage.That Medicare's mental-health guidance lists the eligible provider types and the covered behavioral-health codes, establishing that prescribers bill office E/M while therapists and counselors bill psychotherapy codes, and when a psychotherapy add-on accompanies an E/M visit. As of July 2026..

The reason honest coding matters more in a practice of one is that there is no coder between your note and the claim, so both errors are yours to own. Undercoding out of caution leaves earned money on the table across hundreds of visits; overcoding invites a records request the documentation cannot support. Two structural facts help keep it clean: new and established patient codes are chosen by whether the patient is new to you, a distinction with its own rule covered separately, and an office E/M visit is not a procedure carrying global periods, so it stands on its own each time rather than folding into a surgical package. CPT itself is maintained by the AMA and updated annually, so the specific definitions are worth re-reading each year rather than trusting to memory 5Ref 5American Medical Association (2026).CPT® (Current Procedural Terminology).That CPT, including the office E/M codes and the psychotherapy codes, is maintained by the AMA and updated annually, so the definitions are re-checked each year, and that E/M and psychotherapy are distinct code families.. The single most reliable habit is to write the note so a stranger could see the two MDM elements, or the total time, that justify the code before it is ever billed.