- Key Takeaways
- CPT code 99204 reports a new patient office visit with moderate medical decision making or 45 to 59 minutes of total time on the encounter date.
- A patient is new only if they had no professional service from the same-specialty group in the past three years, and a prior procedure counts too.
- New patient time thresholds run higher than established: 99204 requires 45 to 59 minutes, well above the 30 to 39 minutes for its established counterpart 99214.
- CMS lists new patient visits as an approved Recovery Audit topic, so billing 99204 for a patient who is not truly new invites a downcode or recoupment.
- Under the moderate MDM pathway, meet two of three elements: problems, data, and risk, with prescription drug management alone satisfying the moderate risk element.
CMS lists “New Patient Visits: Incorrect Coding” as an approved Recovery Audit topic, and it covers 99202 through 99205 directly. In other words, whether a patient truly counts as new is something Medicare’s auditors actively check. That is the surprising thing about CPT code 99204: the hard part is not the level, it is the word “new.” Practices are comfortable deciding moderate complexity, then bill a new patient code for someone the group already saw, and the claim gets downcoded to an established visit or recouped later.
Current as of 2026. Always verify code status and payment with your specific payer, since policies change.
What 99204 is: the new patient, level 4 visit
99204 is an office or other outpatient visit for a new patient, supported by moderate medical decision making or 45 to 59 minutes of total time on the date of the encounter. It is the Level 4 new patient code, one above 99203 and one below 99205. Since the 2021 E/M overhaul, history and exam only need to be medically appropriate; the level is set by MDM or time. It is used across nearly every specialty that takes new patients, from primary care to cardiology to behavioral health.
First question: is the patient actually new?
This is where 99204 is won or lost. Under Medicare’s definition, a patient is new only if they have not received any professional service from the physician, or from another provider of the same specialty in the same group practice, within the previous three years. Several parts of that trip practices up:
- Same specialty, same group. Two providers in the same group but different specialties can each see the patient as new. Same specialty in the same group cannot. The group’s tax ID and the providers’ specialties, not just the individual physician, determine status.
- Professional services, not just office visits. The clock starts on any face-to-face professional service, including a surgical or other procedure, not only a prior E/M visit. A patient who had a procedure by the group two years ago is established, even if they never had an office visit.
- Telehealth counts. A prior telehealth professional service within three years makes the patient established.
- Covering and locum providers. A physician covering for another, or a locum standing in, is treated as the physician they cover, so the patient’s status follows the group, not the individual.
Getting this right is a front-desk and registration issue as much as a coding one, because the determination happens at scheduling. When it is wrong, the claim is downcoded to the established equivalent, which pays less, or flagged in exactly the Recovery Audit review CMS has approved. Our guide to CPT code 99214 covers the established counterpart.
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The two pathways: moderate MDM or 45 to 59 minutes
Once the patient is confirmed new, 99204 is supported one of two ways.
Moderate medical decision making means reaching a moderate level in at least two of three areas: the number and complexity of problems addressed, the amount and complexity of data reviewed, and the risk of the management decisions. As with the established codes, prescription drug management counts as moderate risk on its own.
Alternatively, 99204 is supported by 45 to 59 minutes of total time on the encounter date, counting the billing provider’s chart review, the visit, counseling, coordination, and documentation. This is the point people carry over incorrectly from established visits: the new patient thresholds are higher. 99214 needs 30 to 39 minutes, but 99204 needs 45 to 59, because new patient visits involve more work. Applying the established time bands to a new patient undercounts the visit.
Documentation payers expect
A defensible 99204 note should show:
- That the patient meets the new patient definition
- A medically appropriate history and examination
- Either two moderate MDM elements, documented specifically, or a clear statement of total time
- A diagnosis and plan that support the complexity billed
For the MDM path, map the note to the elements: the problems and their status, the data reviewed or ordered, and the risk of the decisions. For the time path, state the total plainly.
Common billing errors to avoid
- Billing a new patient code for an established patient. The single biggest error, and an active audit target. Check the 3-year, same-specialty, same-group rule at scheduling.
- Missing a prior non-E/M service. A past procedure or other face-to-face service makes the patient established.
- Applying established time thresholds. 99204 needs 45 to 59 minutes, not the 30 to 39 used for 99214.
- Under-documenting MDM. Two moderate elements must be visible in the note, not implied.
- Omitting modifier 25 on a same-day procedure. The E/M carries modifier 25 when a separate procedure is performed.
Related codes and modifiers
- 99203 vs 99204 vs 99205: the new patient ladder. 99203 is low MDM or 30 to 44 minutes, 99204 is moderate MDM or 45 to 59 minutes, and 99205 is high MDM or 60 to 74 minutes.
- 99204 vs 99214: the same moderate MDM level, split by new versus established status, with higher time thresholds and higher payment on the new patient side.
- Prolonged services: for a new patient visit beyond 74 minutes, the prolonged code 99417 may be added to 99205, not to 99204.
- G2211: a Medicare add-on code for visit complexity, billable with 99202 through 99215, including 99204. It captures the added resources of serving as the continuing focal point for a patient’s care or treating a single serious or complex condition over time, so it applies to a new patient visit that begins an ongoing care relationship. Since January 2025 it can also be reported alongside modifier 25.
Reimbursement context
99204 is paid under the Medicare Physician Fee Schedule and reimburses more than its established counterpart, reflecting the additional work of a new patient encounter. That payment gap is exactly why the new-patient determination matters: a wrongly billed new patient visit either overpays and invites recoupment, or, when corrected to established, pays less than the work deserved. Treat any single figure as illustrative and confirm the current rate for your setting through the CMS Physician Fee Schedule Look-Up Tool, which updates annually.
The bottom line
99204 rewards the extra work of a first visit, but only when the patient is genuinely new and the note proves the level. Verify new patient status at scheduling against the 3-year, same-specialty, same-group rule, remember that a prior procedure counts, and use the higher new patient time bands. For practices that would rather not police new-patient status and E/M levels claim by claim, Neolytix has supported healthcare organizations across the United States for over 14 years, with E/M coding review built into its medical billing services so new patient claims are defensible before they go out.
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This guide reflects Neolytix’s expertise in healthcare revenue cycle management and is intended for educational purposes only. It does not constitute legal or compliance advice. CPT codes and reimbursement rates are periodically updated by the AMA and CMS.
Sources
- Centers for Medicare & Medicaid Services. Recovery Audit Program approved topic 0043, New Patient Visits: Incorrect Coding (new patient definition and affected codes). https://www.cms.gov/research-statistics-data-and-systems/monitoring-programs/medicare-ffs-compliance-programs/recovery-audit-program/approved-rac-topics-items/0043-new-patient-visits
- American Medical Association. CPT office and outpatient E/M codes (99202 to 99205). https://www.ama-assn.org/practice-management/cpt
- Centers for Medicare & Medicaid Services. Physician Fee Schedule Look-Up Tool. https://www.cms.gov/medicare/physician-fee-schedule/search
- AAPC. CPT code 99204 reference. https://www.aapc.com/codes/cpt-codes/99204
Frequently Asked Questions
What makes a patient new for CPT 99204?
A patient is new when they have not received any professional service, an office visit or a face-to-face service such as a procedure, from the physician or a same-specialty provider in the same group within the past three years. If they have, they are established, and a new patient code like 99204 will be denied or downcoded.
How many minutes is 99204?
On the time pathway, 99204 requires 45 to 59 minutes of total time on the date of the encounter, including chart review, the visit, counseling, coordination, and documentation by the billing provider. This is higher than the established-patient equivalent because new patient visits involve more work. Below 45 minutes generally points to 99203.
What is the difference between 99204 and 99214?
Both are moderate-complexity, level 4 office visits, but 99204 is for new patients and 99214 for established patients. The MDM requirement is the same, moderate, but the time thresholds differ: 99204 needs 45 to 59 minutes versus 30 to 39 for 99214. New patient codes also reimburse more, reflecting the added work.
What is the difference between 99203 and 99204?
Both are new patient office visits, separated by complexity and time. 99203 requires low MDM or 30 to 44 minutes. 99204 requires moderate MDM or 45 to 59 minutes. The most common driver of 99204 over 99203 is moderate-risk decision-making, such as prescription drug management, or reaching the 45-minute time threshold.
Can 99204 be billed for telehealth?
Yes. 99204 can be billed for a telehealth new patient visit when it meets the same moderate MDM or 45 to 59 minute requirement as an in-person visit. Append modifier 95 for audio-video and use the correct place of service. Confirm each payer’s telehealth and new-patient rules, since some limit new patient telehealth.
