4.2 Evaluation & Management (E/M) Coding Mechanics

Evaluation & Management (E/M) Coding Mechanics

Quick Answer: As of the 2021 and 2023 updates, E/M coding for office, outpatient, inpatient, and observation settings is driven entirely by either the level of Medical Decision Making (MDM) OR the Total Time spent by the provider on the date of the encounter. History and Examination elements are no longer used for code selection.

The Evaluation and Management (E/M) section is arguably the most frequently used portion of the CPT manual. For decades, E/M coding relied on a rigid counting system of History, Examination, and Medical Decision Making (MDM) elements. The landmark updates of 2021 (for office/outpatient) and 2023 (for other settings) completely overhauled this system to reduce administrative burden.

The New E/M Framework: MDM vs. Total Time

Under the current guidelines, the level of an E/M service is selected based on one of two criteria:

1. The level of Medical Decision Making (MDM).
2. The Total Time spent by the provider on the date of the encounter.

While a medically appropriate history and/or physical examination must still be documented to support the medical necessity of the visit, these elements do not factor into the final code level selection.

Option 1: Coding by Total Time

When using Total Time for E/M code selection, it is the total time spent by the physician or other qualified healthcare professional (QHP) on the date of the encounter.

This time includes both face-to-face and non-face-to-face activities, such as:

• Preparing to see the patient (e.g., reviewing tests).
• Obtaining and/or reviewing separately obtained history.
• Performing a medically appropriate examination and/or evaluation.
• Counseling and educating the patient/family/caregiver.
• Ordering medications, tests, or procedures.
• Referring and communicating with other healthcare professionals (when not separately reported).
• Documenting clinical information in the electronic health record (EHR).

Note: Time spent by clinical staff (like nurses or medical assistants) cannot be counted toward the provider's total time. Each E/M code has a specific time range (e.g., 99213 requires 20-29 minutes, 99214 requires 30-39 minutes).

Option 2: Coding by Medical Decision Making (MDM)

If not using time, the provider must select the code based on the complexity of Medical Decision Making. MDM is divided into four levels: Straightforward, Low, Moderate, and High.

The level of MDM is determined by evaluating three distinct elements:

1. Number and Complexity of Problems Addressed at the Encounter
2. Amount and/or Complexity of Data to be Reviewed and Analyzed
3. Risk of Complications and/or Morbidity or Mortality of Patient Management

To qualify for a specific level of MDM, the documentation must meet or exceed the requirements for that level in at least two of the three elements.

Element 1: Number and Complexity of Problems Addressed

This element evaluates the conditions the provider is actively managing during the visit.

• Straightforward: 1 self-limited or minor problem.
• Low: 2 or more self-limited/minor problems; OR 1 stable chronic illness; OR 1 acute, uncomplicated illness or injury.
• Moderate: 1 or more chronic illnesses with exacerbation, progression, or side effects of treatment; OR 2 or more stable chronic illnesses; OR 1 undiagnosed new problem with uncertain prognosis; OR 1 acute illness with systemic symptoms; OR 1 acute complicated injury.
• High: 1 or more chronic illnesses with severe exacerbation, progression, or side effects of treatment; OR 1 acute or chronic illness or injury that poses a threat to life or bodily function.

Element 2: Amount and/or Complexity of Data

This element is often the most complex to calculate. It involves counting data points across three categories:

• Category 1: Tests, documents, or independent historian(s) (e.g., ordering a lab, reviewing an external note).
• Category 2: Independent interpretation of tests (e.g., looking at an x-ray yourself, assuming you are not separately billing for the formal interpretation).
• Category 3: Discussion of management or test interpretation with an external physician/QHP/appropriate source.

Example: To reach Moderate data, you need to meet the requirements of at least 1 out of 3 categories (e.g., Category 1: any combination of 3 tests/documents/independent historians).

Element 3: Risk of Complications/Morbidity

This element evaluates the risk associated with the patient's management decisions made at the visit, focusing on the highest level of risk.

• Straightforward: Minimal risk.
• Low: Low risk (e.g., over-the-counter drugs, minor surgery with no identified risk factors).
• Moderate: Moderate risk (e.g., prescription drug management, decision regarding minor surgery with risk factors, decision regarding major surgery without risk factors, diagnosis/treatment significantly limited by social determinants of health).
• High: High risk (e.g., drug therapy requiring intensive monitoring for toxicity, decision for major surgery with identified risk factors, decision regarding emergency major surgery, decision regarding hospitalization).

Office and Other Outpatient E/M Codes (99202-99215)

The most common E/M codes fall into the Office/Outpatient category. These are split into New Patient and Established Patient codes.

New Patient Codes (99202-99205)

• 99202: Straightforward MDM (or 15-29 minutes)
• 99203: Low MDM (or 30-44 minutes)
• 99204: Moderate MDM (or 45-59 minutes)
• 99205: High MDM (or 60-74 minutes) (Note: 99201 was deleted in 2021)

Established Patient Codes (99211-99215)

• 99211: May not require the presence of a physician or other QHP (often called a "nurse visit"). No MDM required.
• 99212: Straightforward MDM (or 10-19 minutes)
• 99213: Low MDM (or 20-29 minutes)
• 99214: Moderate MDM (or 30-39 minutes)
• 99215: High MDM (or 40-54 minutes)

Understanding how to evaluate the documentation to determine the correct MDM level is one of the most highly tested skills on the CCS-P exam.