10.1 CPT Evaluation and Management (E/M) Guidelines

AHIMA Certified Coding Specialist CCS

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1 Chapter 1: ICD-10-CM Diagnosis Coding Fundamentals & UHDDS Guidelines

1.1 ICD-10-CM Structure, Formats, and Core Conventions 1.2 UHDDS Principal Diagnosis Selection Rules 1.3 Secondary Diagnoses Reporting & Present on Admission (POA) Indicators

2 Chapter 2: Circulatory, Cardiac & Vascular Inpatient Coding

2.1 Hypertension, Hypertensive Heart & Chronic Kidney Disease, and CAD 2.2 Acute Myocardial Infarction (AMI) Types & Sequencing 2.3 Heart Failure Types, Acuity & Cardiomyopathy 2.4 Cerebrovascular Disease, Acute Stroke, and Late Effects

3 Chapter 3: Respiratory, Sepsis & Infectious Conditions Coding

3.1 Sepsis, Severe Sepsis, and Septic Shock Guidelines 3.2 Pneumonias, Aspiration Pneumonia, and Influenza 3.3 COPD, Asthma, and Acute Respiratory Failure

4 Chapter 4: Renal, Endocrine, Gastrointestinal & Nutritional Disorders

4.1 Acute Kidney Injury (AKI) & Chronic Kidney Disease (CKD) 4.2 Diabetes Mellitus Types, Manifestations & Complications 4.3 Protein-Calorie Malnutrition & Endocrine Emergencies 4.4 Gastrointestinal Bleeding, Ulcers, and Acute Abdominal Pathologies

5 Chapter 5: Neoplasms, Obstetrics, Perinatal, Injury & Trauma Coding

5.1 Neoplasm Table, Primary, Secondary & Encounters for Therapy 5.2 Obstetrics, Normal/Complicated Deliveries & Puerperium 5.3 Perinatal Conditions & Congenital Malformations 5.4 Traumatic Injuries, Fractures & 7th Character Extensions

6 Chapter 6: ICD-10-PCS Architecture, Conventions & Approaches

6.1 ICD-10-PCS 7-Character System Architecture & Conventions 6.2 ICD-10-PCS The Seven Surgical Approaches 6.3 General PCS Guidelines & Multiple Procedure Rules

7 Chapter 7: ICD-10-PCS Root Operations: Cutting Out, Taking Out & Altering Body Parts

7.1 Excision vs Resection vs Destruction 7.2 Extraction, Drainage, and Extirpation 7.3 Detachment & Amputation Coding 7.4 Release vs Division

8 Chapter 8: ICD-10-PCS Root Operations: Putting In, Putting Back & Moving Body Parts

8.1 Replacement vs Supplement vs Insertion 8.2 Reposition, Transfer, and Reattachment 8.3 Bypass, Dilation, Occlusion, and Restriction

9 Chapter 9: High-Volume Inpatient Surgical & Medical Procedures in ICD-10-PCS

9.1 Coronary Artery Bypass Grafting (CABG) & Percutaneous Coronary Interventions 9.2 Total Joint Arthroplasties & Spinal Fusion 9.3 Mechanical Ventilation & Extracorporeal Therapies

10 Chapter 10: Outpatient CPT & HCPCS Level II Coding & Modifiers

10.1 CPT Evaluation and Management (E/M) Guidelines 10.2 CPT Surgical, Radiology, Pathology & HCPCS Level II Coding 10.3 CPT Modifiers in Hospital Outpatient & Professional Coding

11 Chapter 11: Inpatient Record Review, Clinical Validation & Documentation Integrity

11.1 Inpatient Health Record Analysis & UHDDS Documentation Hierarchy 11.2 Clinical Validation of Diagnoses vs Coding Compliance 11.3 Identifying Reportable Secondary Conditions & Complications

12 Chapter 12: Compliant Provider Queries & AHIMA/ACDIS Standards

12.1 AHIMA/ACDIS Compliant Query Standards & Ethical Principles 12.2 Compliant Query Formats: Open-Ended, Multiple-Choice & Yes/No 12.3 High-Impact Clinical Query Scenarios & Provider Workflow

13 Chapter 13: Inpatient Prospective Payment System (IPPS) & MS-DRG Mechanics

13.1 IPPS Reimbursement Structure & MS-DRG Grouping Logic 13.2 Complications and Comorbidities (CC) & Major CC (MCC) Impact 13.3 All-Patient Refined DRG (APR-DRG) System 13.4 Inpatient Transfer Policies, Cost Outliers & Short-Stay Rules

14 Chapter 14: Outpatient Reimbursement, Coding Edits & Fraud/Abuse Compliance

14.1 Hospital Outpatient Prospective Payment System (OPPS) & APCs 14.2 National Correct Coding Initiative (NCCI) Edits & MUEs 14.3 Hospital-Acquired Conditions (HAC) Reduction & Quality Programs 14.4 Healthcare Fraud, Abuse Laws, Audits & AHIMA Ethical Standards

15 Chapter 15: Health Information Technology, CAC, Encoders & Data Security

15.1 Electronic Health Records (EHR) & Computer-Assisted Coding (CAC) 15.2 Logic-Based Encoders, Groupers & Health Data Systems 15.3 HIPAA Privacy/Security, Cybersecurity & Internal Coding Audits

10.1 CPT Evaluation and Management (E/M) Guidelines

Key Takeaways Explain This Topic AI

For E/M families whose current instructions allow either basis, select the level by Medical Decision Making (MDM) or total time on the date of the encounter; emergency-department visits use MDM, and critical care and other time-based services follow their own instructions.

Medical Decision Making (MDM) requires meeting or exceeding the threshold criteria in at least 2 of the 3 core elements: (1) Number and Complexity of Problems Addressed, (2) Amount and/or Complexity of Data to be Reviewed and Analyzed, and (3) Risk of Complications and/or Morbidity or Mortality of Patient Management.

Inpatient and Observation E/M services share a unified CPT code structure (Initial: 99221-99223, Subsequent: 99231-99233, Discharge: 99238-99239, Same-Day Admit/Discharge: 99234-99236), eliminating the historical dichotomy between inpatient and observation coding.

Emergency Department E/M codes (99281-99285) are selected strictly on the basis of MDM because care is episodic and provided concurrently across multiple patients, making Total Time an invalid selection criterion.

Last updated: August 2026

CPT Evaluation and Management (E/M) Guidelines

AHIMA CCS Exam Focus: Evaluation and Management (E/M) coding represents a major testing pillar on the Certified Coding Specialist (CCS) exam. Candidates are evaluated on their ability to correctly determine levels of Medical Decision Making (MDM), calculate total practitioner time on the date of encounter, assign unified hospital inpatient and observation codes, code emergency department encounters without time criteria, and distinguish formal consultations from transfers of care.

1. The Modern E/M Framework: MDM vs. Total Time

The AMA revised E/M code selection across major settings, and CMS adopted applicable changes for Medicare. Payer recognition still differs—for example, Medicare does not recognize CPT consultation codes—so apply the code set, setting, date of service, and payer instructions.

Fundamental Principles of Modern E/M Coding

Elimination of History and Exam as Code Drivers: History and Physical Examination are no longer scored quantitatively to determine the code level. While a medically appropriate history and/or physical examination must be documented, the nature and extent are left to the clinical judgment of the treating practitioner.

Two Pathways for Code Selection: Code level selection is governed strictly by:

Medical Decision Making (MDM) ; OR

Total Time spent on the date of the encounter (where time ranges are published).

Exclusion of Time in Emergency Department: Emergency Department E/M codes ( 99281–99285 ) cannot be selected based on time because emergency services are unscheduled, episodic, and provided concurrently to multiple patients. Modern E/M Code Selection Architecture:

┌─────────────────────────────────────────────────────────────┐
│ CLINICAL ENCOUNTER │
│ (Medically Appropriate History & Exam Performed) │
└──────────────────────────────┬──────────────────────────────┘
│
┌───────────────┴───────────────┐
▼ ▼
┌───────────────────┐ ┌───────────────────┐
│ MEDICAL DECISION │ │ TOTAL TIME │
│ MAKING (MDM) │ │ (Date of Service) │
│ (Requires 2 of 3) │ │ (Excludes ED/99281│
└─────────┬─────────┘ │ through 99285)│
│ └─────────┬─────────┘
└───────────────┬───────────────┘
▼
FINAL E/M CODE SELECTION
Total Time Accounting Rules

When time is utilized for code selection, it reflects total practitioner time (both face-to-face and non-face-to-face time) expended on the calendar date of the encounter :

Included Activities: Reviewing tests prior to seeing the patient, obtaining/reviewing history, performing the exam, counseling/educating the patient/family, ordering medications/tests, communicating with other healthcare professionals, documenting clinical notes in the EHR, and independent interpretation of tests (not billed separately).

Excluded Activities: Clinical staff time, general teaching not specific to the patient, travel time, and services that are reported separately under other CPT codes (e.g., performing a diagnostic ultrasound or minor surgical procedure).

2. The Three Elements of Medical Decision Making (MDM)

To establish a given level of MDM ( Straightforward, Low, Moderate, or High ), the clinical documentation must satisfy the scoring thresholds for at least 2 out of the 3 elements defined below. MDM Level Assignment Rule: "2 Out of 3 Elements Rule"

Element 1: Problems Addressed ➔ Level Achieved (e.g., Moderate)
Element 2: Data Reviewed/Analyzed ➔ Level Achieved (e.g., High)
Element 3: Risk of Management ➔ Level Achieved (e.g., Moderate)

Overall MDM Level = MODERATE (Satisfies 2 of 3 at or above Moderate)

Level of MDM Problems Addressed (Element 1) Data Reviewed & Analyzed (Element 2) Risk of Complications / Morbidity (Element 3)

Straightforward 1 self-limited or minor problem Minimal or none Minimal risk of morbidity from treatment/testing

Low • 2+ self-limited/minor problems;; • 1 stable chronic illness;; • 1 acute, uncomplicated illness/injury;; • 1 stable acute illness;; • 1 acute uncomplicated illness/injury requiring hospital admission Limited (Must meet 1 of 2 categories):; • Category 1: Total of 2 from: review prior external notes, review unique test result, order unique test.; • Category 2: Assessment requiring independent historian Low risk of morbidity from treatment (e.g., OTC medications, physical therapy, minor surgery without identified risk factors)

Moderate • 1+ chronic illness with mild exacerbation/progression;; • 2+ stable chronic illnesses;; • 1 undiagnosed new problem with uncertain prognosis;; • 1 acute illness with systemic symptoms;; • 1 acute complicated injury Moderate (Must meet 1 of 3 categories):; • Category 1: Total of 3 from: review prior external notes, review unique test result, order unique test, independent historian.; • Category 2: Independent interpretation of test performed by another provider (not separately billed).; • Category 3: Discussion of management/test interpretation with external provider/QHP Moderate risk of morbidity from treatment (e.g., Prescription drug management, decision regarding elective major surgery without identified risk factors, minor surgery with identified risk factors, diagnosis/treatment limited by SDOH)

High • 1+ chronic illness with severe exacerbation/progression posing threat to life/bodily function;; • 1 acute or chronic illness/injury that poses a threat to life or bodily function (e.g., acute MI, pulmonary embolism, severe sepsis, acute stroke) Extensive (Must meet at least 2 of the 3 categories):; • Category 1: Total of 3 items (review/order tests, external notes, independent historian).; • Category 2: Independent interpretation of tests.; • Category 3: Discussion with external provider/QHP High risk of morbidity from treatment (e.g., Drug therapy requiring intensive monitoring for toxicity, decision regarding emergency major surgery, elective major surgery with identified risk factors, hospitalization decision, DNR/palliative de-escalation)

Critical Definitions within MDM Elements

Problem Addressed: A problem is addressed or managed when it is evaluated or treated by the practitioner at the encounter. Receiving a referral or merely noting a condition exists without evaluation does not constitute addressing the problem.

Prescription Drug Management (Moderate Risk): Requires active clinical decision-making regarding prescription pharmaceuticals (initiating, modifying dose, discontinuing, or actively reviewing and continuing a medication after assessing effectiveness and adverse effects).

Drug Therapy Requiring Intensive Monitoring for Toxicity (High Risk): Applies to medications that have a narrow therapeutic window or significant potential for serious toxicity where ongoing laboratory or clinical monitoring is mandatory to assess drug levels or organ function (e.g., therapeutic heparin monitoring with PTT/anti-Xa, warfarin with INR, lithium levels, aminoglycoside troughs, systemic chemotherapy). Monitoring must be for potential adverse effects, not purely therapeutic efficacy.

Social Determinants of Health (SDOH - Moderate Risk): Diagnosis or treatment significantly limited by social circumstances (e.g., homelessness, severe economic insecurity, illiteracy, food insecurity) affecting medical management.

3. Inpatient and Observation Care Services

In the unified E/M framework, hospital inpatient care and hospital observation care are collapsed into a single set of CPT codes, eliminating previous administrative disputes regarding inpatient status vs. observation placement. Unified Inpatient and Observation CPT Code Families:

[Initial Inpatient / Observation Care] ➔ 99221 (Low), 99222 (Moderate), 99223 (High)
[Subsequent Inpatient / Observation Care]➔ 99231 (Low), 99232 (Moderate), 99233 (High)
[Same-Day Admission and Discharge] ➔ 99234 (Low), 99235 (Moderate), 99236 (High)
[Discharge Management Services] ➔ 99238 (≤ 30 minutes), 99239 (> 30 minutes)

Service Category CPT Code Required MDM Level Required Total Time (CPT 2023+ Thresholds)
Initial Inpatient / Observation 99221 Straightforward or Low 40 minutes
99222 Moderate 55 minutes
99223 High 75 minutes
Subsequent Inpatient / Observation 99231 Straightforward or Low 25 minutes
99232 Moderate 35 minutes
99233 High 50 minutes
Same-Day Admission & Discharge 99234 Straightforward or Low 45 minutes
99235 Moderate 70 minutes
99236 High 85 minutes
Discharge Services 99238 N/A (Time-based) 30 minutes or less
99239 N/A (Time-based) More than 30 minutes
Same-Day Admission and Discharge Rules (99234–99236)

When a patient is admitted to hospital inpatient or observation status and discharged on the same calendar date , codes 99234–99236 must be reported.

For Medicare claims, the patient must have an observation or inpatient stay of at least 8 hours but less than 24 hours on the same calendar day to bill 99234–99236 . If the stay is less than 8 hours, only the Initial Inpatient/Observation code ( 99221–99223 ) is reported, without a discharge code.

If the encounter spans two distinct calendar dates (e.g., admitted at 11:30 PM on Monday, discharged at 8:00 AM on Tuesday), the coder reports Initial Care ( 99221–99223 ) for day one and Discharge Management ( 99238–99239 ) for day two.

4. Emergency Department Services (99281–99285)

Emergency department services are provided in a hospital-based emergency department that operates 24 hours a day. Unlike office and inpatient visits, ED E/M coding is governed by unique operational constraints. Emergency Department Code Hierarchy:

99281 ➔ Minimal / triage service (May not require presence of physician/QHP)
99282 ➔ Straightforward MDM
99283 ➔ Low MDM
99284 ➔ Moderate MDM
99285 ➔ High MDM (High risk of morbidity/mortality; immediate threat to life/function)
Distinct ED Coding Rules

No Distinction Between New and Established Patients: All patients presenting to the emergency department are coded using the same 99281–99285 series.

Time Cannot Be Used for Code Selection: Because emergency care is intermittent and shared among multiple concurrent emergencies, time is not recognized as a code selection parameter.

Facility vs. Professional ED Coding:

Professional Fee (Physician) Coding: Strictly follows AMA CPT MDM definitions.

Hospital Facility ED Coding: Hospitals report CPT codes 99281–99285 on the UB-04 claim form to reflect the utilization of hospital facility resources (nursing intensity, clinical staff interventions, room prep, supplies). Hospitals establish internal operational guidelines (e.g., point-based scoring systems) that must be reasonable, consistent, and reflective of resource consumption.

5. Consultations vs. Transfers of Care

A Consultation is an E/M service provided by a physician or QHP whose opinion or advice regarding evaluation or management of a specific problem is requested by another physician or other appropriate source. The "3 Rs" of Consultation Coding:

1. REQUEST ➔ Documented request from referring physician in the medical record.

2. REASON ➔ Documented necessity/clinical rationale for consultation.

3. REPORT ➔ Formal written report and findings communicated back to requesting provider.

Consultation Codes (CPT 2023+ Framework)

Office / Outpatient Consultations: 99242 (Low MDM / 20 min), 99243 (Moderate MDM / 30 min), 99244 (Moderate-High MDM / 40 min), 99245 (High MDM / 55 min). (Code 99241 was deleted) .

Inpatient / Observation Consultations: 99252 (Straightforward MDM / 35 min), 99253 (Low MDM / 45 min), 99254 (Moderate MDM / 60 min), 99255 (High MDM / 80 min). (Code 99251 was deleted) .

Consultation vs. Transfer of Care

Transfer of Care: Occurs when a practitioner surrenders total responsibility for the management of a patient's care or a specific condition to another practitioner. When a physician assumes ongoing care without the requesting physician maintaining principal management, the service is not a consultation ; it is coded as an Initial/Subsequent Hospital Care visit ( 99221–99233 ) or New/Established Office Visit ( 99202–99215 ).

Medicare Policy on Consultations: Since 2010, Medicare (CMS) does not recognize CPT consultation codes ( 99242–99255 ) for payment. For Medicare beneficiaries, physicians must bill standard Initial Inpatient Care codes ( 99221–99223 ) or Office/Outpatient codes ( 99202–99215 ), appending modifier AI (Principal Physician of Record) if acting as the admitting attending physician to distinguish from consulting specialists.

6. CCS Examination Traps & Clinical Pitfalls
Top 5 CCS Exam Traps in E/M Coding

Trap 1: The "Prescription Drug Management Trap": Assuming prescription drug management automatically guarantees Moderate MDM. Correction: Prescription drug management satisfies Moderate Risk (Element 3), but overall MDM requires 2 out of 3 elements . If the problem is a single uncomplicated illness (Low) and minimal data is reviewed (Low), overall MDM is Low (99213/99221/99231) .

Trap 2: Using Time in the Emergency Department: Attempting to code 99285 based on physician time documented in the ED. Correction: ED codes cannot be coded by time under any circumstances.

Trap 3: Misapplying Same-Day Admit/Discharge (99234–99236): Billing 99234–99236 when admission occurs at 10 PM and discharge occurs at 6 AM the following morning. Correction: This spans two calendar dates; code Initial Inpatient Care ( 99221–99223 ) on Day 1 and Discharge ( 99238–99239 ) on Day 2.

Trap 4: Counting Integral Tests in MDM Data: Crediting the ordering or review of an EKG or X-ray when the physician also bills the professional component of that test ( 93000 or 71045 ). Correction: If a procedure is billed separately, it cannot be counted in MDM Data.

Trap 5: Coding Medicare Consultations: Reporting 99253 or 99254 on a Medicare claim. Correction: CMS does not pay for consult codes; report initial hospital care 99221–99223 .