Managing Evaluation and Management Coding

Applies the 2021+ CMS/AMA E/M documentation framework to select the correct E/M code level based on medical decision-making (MDM) complexity or total physician/qualified health professional (QHP) time on the date of encounter. Covers office/outpatient (99202–99215), inpatient/observation (99221–99223, 99231–99236), consultations, and subsequent care services.

Why This Skill Exists

The 2021 E/M restructure eliminated history and exam as code-level determinants for office/outpatient visits, making MDM or time the sole drivers. In 2023, CMS extended similar logic to inpatient and observation services. Misapplication of MDM elements — especially risk table interpretation and data element counting — is the most common source of E/M level errors. CMS CERT data consistently shows E/M services among the highest-error service categories, with improper payments exceeding $2 billion annually for E/M alone.

Checkpoint A — Intake

Questions to Confirm Before Starting

What E/M category is being coded? (office new/established, inpatient initial/subsequent, observation, consultation, ED)
Is the provider selecting code level by MDM or by time?
What is the date of service and patient status (new vs. established, initial vs. subsequent)?
Is there a separately reportable procedure on the same date requiring modifier 25 consideration?
Does the encounter involve shared/split visit rules (physician + NPP)?
Are there prolonged services to consider (99417 for office, 99418 for inpatient)?
Is the payer Medicare, Medicaid, or commercial (commercial may not recognize all CMS rules)?

Documents Required

Complete encounter note (HPI, ROS, exam, assessment/plan)
Problem list with status of each condition addressed
Orders placed during the encounter (labs, imaging, referrals, prescriptions)
Time documentation if time-based coding is used (total time on date of encounter)
Prior visit notes if referenced for data review
Test results reviewed during the encounter
Any care coordination or consultation documentation

Step 1 — Determine E/M Category and Patient Status

Identify the correct code family before assessing level.

New patient: No professional services from the same provider or same-specialty/same-group provider in the prior 3 years.
Established patient: Any professional service within 3 years from same provider or same-specialty/same-group.
Office/Outpatient: 99202–99205 (new), 99211–99215 (established). Note: 99201 was deleted in 2021.
Inpatient/Observation: 99221–99223 (initial), 99231–99233 (subsequent), 99234–99236 (same-day admit/discharge).
ED visits: 99281–99285 — still use the 1995/1997 guidelines (MDM, history, exam) until CMS updates. New/established distinction does not apply.
Consultations: 99241–99245 (office), 99251–99255 (inpatient). Medicare does not recognize consultation codes — use initial visit codes with modifier AI for teaching physicians.

Step 2 — Assess Medical Decision-Making

MDM has three elements; the level is determined by meeting or exceeding the threshold in 2 of 3.

Element 1: Number and Complexity of Problems Addressed

| MDM Level | Problem Types | |-----------|---------------| | Straightforward | 1 self-limited or minor problem | | Low | 2+ self-limited problems; 1 stable chronic illness; 1 acute uncomplicated illness | | Moderate | 1+ chronic illness with mild exacerbation; 2+ stable chronic illnesses; 1 undiagnosed new problem with uncertain prognosis; 1 acute illness with systemic symptoms | | High | 1+ chronic illness with severe exacerbation; 1 acute/chronic illness posing threat to life or bodily function |

A "problem addressed" must have assessment, plan, or management documented — listing it in the problem list alone is insufficient.
Stable chronic conditions count only when the provider documents management actions taken during the visit.

Element 2: Amount and/or Complexity of Data Reviewed and Analyzed

| MDM Level | Data Requirements | |-----------|-------------------| | Straightforward | Minimal or none | | Low | Review of prior external note/test OR order of test | | Moderate | Order and review of tests; review of prior external notes with independent interpretation of an image/tracing/specimen; discussion of management with external physician | | High | As moderate, PLUS independent interpretation of test performed by another physician/QHP |

"Independent interpretation" means the provider personally reviews the raw data (image, tracing, specimen) and documents their own findings — not simply reading another provider's report.
Each unique test ordered = 1 data point. A panel (e.g., CMP) = 1 test, not 14 individual analytes.

Element 3: Risk of Complications, Morbidity, or Mortality

| MDM Level | Risk Examples | |-----------|---------------| | Straightforward | OTC medications, minor surgery with no risk factors | | Low | Prescription drug management, minor surgery with identified risk factors, diagnostic procedures with no identified risk factors | | Moderate | Prescription drug management requiring monitoring for toxicity; decision for minor surgery with identified risk factors; diagnosis/treatment significantly limited by social determinants of health | | High | Drug requiring intensive monitoring (e.g., chemotherapy, immunosuppressants); decision for major surgery; decision for emergency major surgery; DNR decision; parenteral controlled substances |

Risk is assessed based on the decision made at THIS encounter, not outcomes.
Social determinants of health can raise the risk level to moderate when they significantly limit diagnosis or treatment.

Step 3 — Apply Time-Based Code Selection (Alternative Path)

If the provider documents total time, time alone determines the code level.

Office/Outpatient time ranges (established):
- 99211: Not time-based (typically nurse visit)
- 99212: 10–19 minutes
- 99213: 20–29 minutes
- 99214: 30–39 minutes
- 99215: 40–54 minutes
- 99417: Each additional 15 minutes beyond 99215 (55+ minutes)
Office/Outpatient time ranges (new):
- 99202: 15–29 minutes
- 99203: 30–44 minutes
- 99204: 45–59 minutes
- 99205: 60–74 minutes
- 99417: Each additional 15 minutes beyond 99205 (75+ minutes)
Time includes face-to-face and non-face-to-face activities on the date of encounter: reviewing records, ordering tests, care coordination, documentation, counseling.
Time documentation must state the total time — "approximately 45 minutes" is acceptable; vague statements like "extended visit" are not.
For prolonged services (99417), the first unit requires the minimum threshold time for the base code to be exceeded by at least 15 minutes.

Step 4 — Handle Split/Shared Visits

Apply when a physician and NPP both provide services in the same encounter.

The billing provider must perform a substantive portion of the visit.
For time-based coding: combine the time of both providers, but the billing provider must have performed the substantive portion.
For MDM-based coding: the billing provider must personally perform one of the three MDM elements.
Document who performed which elements and which provider is billing.
Medicare requires the physician to bill if using the split/shared visit rules in facility settings.

Step 5 — Evaluate Modifier 25 Necessity

When a procedure is performed on the same date, assess whether a separately identifiable E/M is supported.

The E/M must represent a significant, separately identifiable service beyond the typical pre-operative and post-operative work of the procedure.
The documentation must support the E/M through a distinct problem or distinct MDM elements not related to the procedure decision.
Do not automatically append modifier 25 to every E/M billed with a procedure — this is a top OIG audit target.

Checkpoint B — Review

[ ] Correct E/M category and code family selected for the encounter type
[ ] MDM grid applied correctly — 2 of 3 elements meet or exceed the billed level
[ ] Each problem counted is actually addressed with documented management
[ ] Data elements counted are supported by documentation showing review/order
[ ] Risk level matches the CMS risk table — not over-interpreted
[ ] If time-based: total time is explicitly documented and falls within the correct range
[ ] Split/shared visit rules applied correctly if applicable
[ ] Modifier 25 used only when documentation clearly supports a separately identifiable service

Quality Audit

[ ] Code level is supportable by either MDM OR time (not mixing elements from both)
[ ] New vs. established patient status verified against 3-year rule
[ ] All problems counted as "addressed" have documented assessment/plan entries
[ ] Independent interpretation of data is documented with the provider's own findings
[ ] Risk table application does not conflate overall patient risk with encounter-specific risk
[ ] Prolonged service add-on codes (99417) meet the minimum time threshold
[ ] Documentation timestamps are internally consistent (not contradicted by schedule or other notes)

Guidelines

Apply AMA/CMS 2021+ E/M guidelines for office/outpatient visits (99202–99215)
Apply CMS 2023+ guidelines for hospital inpatient/observation services (99221–99236)
Reference the AMA MDM grid published in CPT Professional Edition Appendix for MDM element definitions
Follow CMS MLN Matters articles for Medicare-specific interpretations of E/M rules
For ED visits (99281–99285), continue applying 1995/1997 Documentation Guidelines until CMS issues revised criteria
Never upcode based on assumed complexity — the documented MDM elements or documented time must support the level selected
Mark with [VERIFY] and escalate any encounter where MDM elements are borderline between two levels
Include disclaimer that E/M code selection is based on documentation as presented and does not constitute legal compliance advice