CPT® Code 99204

2025 Quick Guide: CPT 99204

• Definition: New patient visit requiring Moderate MDM or 45–59 minutes total time.
• Patient Status: Must not have been seen by the practice in the last 3 years.
• Reimbursement: Approx. $167 (Medicare National Avg).
• Top Audit Risk: Billing 99204 for an established patient (should be 99214).

CPT 99204 is the standard medical billing code for a "Level 4" new patient evaluation and management (E/M) service. It is designed for patients presenting with moderately complex issues, such as uncontrolled diabetes, new-onset asthma, or acute injuries requiring management decisions.

As of 2021, code selection is based entirely on Medical Decision Making (MDM) or Total Time, removing the old requirements for bullet-point history and exams.

1. Definition and Key Criteria for CPT 99204

The AMA defines CPT 99204 as an office or outpatient visit for a new patient which requires a "medically appropriate history and/or examination" and Moderate Medical Decision Making (MDM). Alternatively, providers can bill based on time if 45–59 minutes are spent on the date of the encounter.

2. Comparison: 99203 vs. 99204 vs. 99205

Choosing the correct level is critical for compliance and revenue. Use this table to differentiate Level 4 visits from Levels 3 and 5.

Note: If time exceeds 74 minutes, use 99205 + prolonged services code 99417 (Commercial) or G2212 (Medicare).

3. New Patient vs. Established Patient

CPT 99204 is exclusively for new patients. A patient is "new" if they have not received professional services from a physician of the same specialty in the same group practice within the last 3 years.

Warning: If the patient is established, you must use CPT 99214 instead. 99214 requires only 30-39 minutes or Moderate MDM. Billing 99204 for an established patient is a frequent cause of claim denials.

4. Moderate Medical Decision Making (MDM) Requirements

To qualify for Moderate MDM (Level 4), the visit must meet 2 out of the 3 following elements:

1. Problems (Number/Complexity):

   • 1 or more chronic illnesses with exacerbation/progression.
   • 2 or more stable chronic illnesses.
   • 1 undiagnosed new problem with uncertain prognosis (e.g., breast lump).
   • 1 acute illness with systemic symptoms (e.g., pneumonia).

2. Data (Reviewed/Analyzed): (Must meet 1 of 3 categories)

   • Review of 3 unique tests, documents, or independent historians.
   • Independent interpretation of a test performed by another (e.g., reading an X-ray).
   • Discussion of management with an external physician.

3. Risk (of Management): Moderate risk of morbidity from additional diagnostic testing or treatment. Examples:

   • Prescription drug management (New Rx or refill).
   • Decision regarding minor surgery with risk factors.
   • Diagnosis significantly limited by Social Determinants of Health (SDOH).

flowchart TD
    A[New Patient Visit] --> B{Patient seen in last 3 years?}
    B -- Yes --> C[Use Established Patient Code<br>e.g. 99214]
    B -- No --> D{Select Coding Method}
    D --> E[MDM-Based]
    D --> F[Time-Based]
    F --> G{Total Time on Date of Service?}
    G -- 30-44 min --> H[99203]
    G -- 45-59 min --> I[99204]
    G -- 60-74 min --> J[99205]
    G -- 75+ min --> K[99205 + 99417/G2212]
    E --> L{MDM Level?}
    L -- Low --> H
    L -- Moderate --> I
    L -- High --> J
    I --> M{Meets 2 of 3 MDM Elements?}
    M -- Yes --> N[Bill 99204]
    M -- No --> O[Downcode to 99203]

5. Time-Based Coding Rules

If coding by time, the total time must fall between 45 and 59 minutes on the date of service. This includes face-to-face and non-face-to-face activities:

• Reviewing prior records/tests.
• Obtaining history and performing the exam.
• Counseling and educating the patient/family.
• Ordering meds, tests, or procedures.
• Documenting the visit in the EHR.
• Care coordination (on the same day).

Note: You cannot count time spent by clinical staff (nurses/MAs).

6. Documentation Cheat Sheet

To support a 99204 claim and survive an audit, ensure your documentation includes specific details.

99204 Documentation Checklist

• Status: Explicitly confirm "New Patient" (no visits in 3 years).
• MDM Rationale: "Patient has uncontrolled diabetes (Problem 1) and hypertension (Problem 2). Started Metformin (Moderate Risk)."
• Data: "Reviewed external cardio notes and recent lab panel (Data)."
• Time Statement (if using time): "I spent 50 minutes total time on the date of service, including record review, exam, counseling on lifestyle changes, and documentation."
• Modifiers: If a separate procedure was done (e.g., biopsy), append Modifier 25 to the E/M code.

7. Reimbursement and Frequency of Use

CPT 99204 is a high-value code. The 2025 Medicare national average reimbursement is approximately $167. Because it pays significantly more than a Level 3 visit (~$113), payers frequently audit it for "upcoding."

Telehealth: 99204 is permanently approved for telehealth. Ensure you use the appropriate Place of Service (POS) code (e.g., 02 or 10) and modifier (95) depending on payer rules. The service must use real-time audio and video.