What Is the 99204 CPT Code?
The 99204 CPT code is a new patient evaluation and management code that reports an office or outpatient visit requiring moderate-complexity medical decision making or 45 to 59 minutes of total time on the date of service. It is the level 4 code in the new patient series 99202 through 99205 and one of the most commonly billed new patient codes in pediatric practices.
Who counts as a new patient for 99204? A new patient is one who has not received a face-to-face professional service from you, or from another provider of the same specialty and subspecialty in your group, within the past three years.
How is 99204 different from 99214? Both require moderate MDM, but 99204 is the level 4 code for a new patient (45 to 59 minutes) while 99214 is the level 4 code for an established patient (30 to 39 minutes), and 99204 pays more because a new patient workup takes more work.
What does 99204 pay in 2026? Under the CMS 2026 Physician Fee Schedule, 99204 carries a work RVU of 2.60, with an estimated Medicare payment of roughly $118 to $120 depending on locality. Commercial payers commonly reimburse 120% to 250% of the Medicare rate.
CPT code 99204 looks straightforward on the claim form, but it is one of the codes where pediatric practices most consistently leave money on the table. It reports a new patient office visit with moderate complexity, the kind of encounter a pediatrician handles when a child arrives with a new chronic condition like asthma or ADHD, a complex presentation requiring workup, or multiple problems that demand real clinical decision making.
The billing partners inside the Billing Service Quotes network process pediatric E/M claims across all 50 states, and the pattern is consistent. When 99204 goes wrong, it is almost never because the code itself was wrong. It is because the documentation did not match the level, the new-versus-established check was skipped, or a same-day preventive visit triggered a modifier error. This guide covers the descriptor, the rules that trip up pediatric billing teams, and the fixes that keep these claims paid the first time.
What Does the 99204 CPT Code Cover?
The 99204 CPT code covers a new patient office or outpatient visit with a medically appropriate history and exam and moderate-complexity medical decision making. The American Medical Association places it as the level 4 code in the 99202 to 99205 new patient range, one step below the high-complexity 99205 and one above the low-complexity 99203.
Since the 2021 E/M overhaul, you select the code by medical decision making or by total time, not by counting history and exam bullets. The code carries a work RVU of 2.60, which reflects the added effort of evaluating a patient with no prior record in your practice. The key qualifier is that the visit is for a genuine clinical problem, not a preventive checkup. Preventive visits for new patients use the 99381 through 99385 series, and confusing the two is a common source of denials in pediatric offices.
For practices still building their front-office billing workflows, structuring the intake process correctly is what feeds clean E/M claims from the start.
How Do You Document a 99204 Visit Correctly?
A clean 99204 claim starts with documentation that matches the level. Run every new-patient visit through these steps before it goes out.
- Confirm the patient is new. No same-specialty visit in your group within three years.
- Select the code by moderate MDM or by 45 to 59 minutes of total time. You need one or the other, not both.
- Document a chief complaint and history of present illness with the clinical detail relevant to the problems addressed.
- Record the problems addressed, data reviewed, and risk that together support moderate MDM under the AMA table.
- Capture total time on the date of service if coding by time, counting only provider work, not clinical staff time.
- Append modifier 25 when a separate preventive service is billed the same day, placed on the problem-oriented code.
- Match each service to a specific diagnosis before the claim goes out.
The most common issue we see providers run into is under-documenting the MDM. A note that records moderate complexity in fact but reads as low complexity on paper gets downcoded to 99203, and the practice loses roughly $50 per encounter without realizing it.
New Patient E/M Codes: 99202 Through 99205
The new patient E/M codes climb by complexity and time. The table shows where 99204 sits in the ladder.
| CPT Code | MDM Level | Total Time | Typical Pediatric Use |
|---|---|---|---|
| 99202 | Straightforward | 15 to 29 min | Minor self-limited problem such as a mild rash or simple cold |
| 99203 | Low | 30 to 44 min | Uncomplicated acute illness in a new patient |
| 99204 | Moderate | 45 to 59 min | New chronic condition (asthma, ADHD) or multiple problems |
| 99205 | High | 60 to 74 min | Severe or high-risk presentation requiring extensive workup |
Select the level by medical decision making or by total time, whichever supports the higher code. The 99203 to 99204 step is where pediatric practices under-code most often, because moderate complexity is more subjective than the clear thresholds of 99205. Across the billing companies we vet, a recurring pattern is that new-patient visits for ADHD evaluations, new asthma diagnoses, and multi-problem first encounters routinely qualify for 99204 but get coded as 99203 by default.
How Much Does 99204 Pay in 2026?
Under the CMS Calendar Year 2026 Physician Fee Schedule, 99204 carries a work RVU of 2.60 and is paid using the 2026 conversion factor of $33.40 for most clinicians, with the exact allowed amount varying by locality through geographic adjustment. The estimated Medicare payment is roughly $118 to $120 depending on your region. Commercial payers commonly reimburse 120% to 250% of the Medicare rate.
The practical point for pediatrics is under-coding. 99204 pays materially more than 99203, roughly $50 more per encounter in most fee schedules, so defaulting a moderately complex new visit to 99203 quietly loses revenue. Over-coding carries the opposite risk: 99204 sits under the same OIG scrutiny as 99214, the established-patient level 4, so the documentation has to match the level.
The G2211 add-on. The visit-complexity add-on G2211 can add roughly $16 to $19 to the Medicare payment on a qualifying 99204 visit when the billing provider is the continuing focal point for a child’s ongoing or complex condition. For 2026, G2211 is also reportable with home and residence E/M codes. You cannot bill G2211 with modifier 25 unless the paired service is a Part B preventive service, immunization, or annual wellness visit.
Non-physician providers. Under Medicare, nurse practitioners and physician assistants are reimbursed at 85% of the physician fee schedule, so the same 99204 pays less when a non-physician provider bills it.
Use the CMS Physician Fee Schedule Look-Up Tool to confirm the exact 99204 rate for your locality. Note that the proposed 2027 Medicare payment changes would reduce the conversion factor further and cut same-day modifier 25 payments to 50 percent, making accurate coding on every 99204 even more important heading into next year.
If your practice is defaulting complex new-patient visits to 99203, or fighting new-versus-established denials, you may be leaving real money on the table. A vetted pediatric billing partner can audit your E/M coding and recover it. Billing Service Quotes matches your practice with billing companies that specialize in pediatrics, at no cost to you.
Can You Bill 99204 With a Preventive Visit on the Same Day?
Yes, when a new patient comes in for a checkup and the provider also addresses a significant, separate problem. Bill the new-patient preventive code (99381 to 99385) for the well visit and 99204 with modifier 25 for the problem E/M, each linked to its own diagnosis and supported by its own note.
The bar is significance. A trivial finding handled inside the checkup, such as advising a cream for a minor rash, does not justify a separate 99204. The problem has to require meaningful additional work beyond the preventive visit, with its own history, exam, and decision making documented. When it qualifies, two clean notes and two diagnoses make the separate service obvious on the record.
For a deeper look at how diagnosis selection affects these paired claims, our breakdown of ICD-10 code I49.9 illustrates how a single code choice changes the trajectory of a claim.
Common 99204 Denials and How to Avoid Them
Across the pediatric claims our network partners handle, the 99204 denials cluster into a short, predictable list.
- New-versus-established error. Coding 99204 when the child was seen within three years by a same-specialty provider in the group. This should have been 99214.
- Missing modifier 25 on same-day sick visit. When a problem-oriented visit rides alongside a preventive visit, the modifier goes on the problem code, not on the preventive code.
- Under-documented MDM. A note that records moderate complexity in fact but reads as low on paper gets downcoded to 99203.
- Over-coding without support. Billing 99204 when the documentation only supports 99203. OIG audits target level 4 E/M codes specifically.
- Wrong diagnosis pairing. Attaching a preventive Z-code as the primary diagnosis to a problem-oriented 99204 triggers a medical-necessity mismatch.
- Time documented without detail. Recording total time but not listing the activities performed gives auditors nothing to verify.
One question we hear constantly from practice managers is why their new-patient revenue per visit has dropped even though volume is stable. In our experience matching providers with billing partners, the answer almost always traces to the 99203-to-99204 coding gap. The visit qualifies for the higher code, but the biller defaults to the lower one because the note does not make the moderate complexity unmistakable.
When to Outsource Pediatric E/M Coding
Providers often come to us after months of under-coded new-patient visits, not because the front-office team is careless but because E/M level selection requires a judgment call that in-house billers are not always trained to make. The 99203-to-99204 line is where the gap shows up most clearly: moderate complexity is harder to prove than straightforward or high, so a cautious coder rounds down and the practice loses $50 per encounter, multiplied across hundreds of new-patient visits a year.
A billing partner that specializes in pediatrics already knows which payers audit level 4 new-patient claims, how to structure the MDM documentation so the code holds, and when the G2211 add-on applies. That expertise pays for itself when the alternative is leaving money on routine visits.
Frequently Asked Questions
When you code by time, 99204 requires 45 to 59 minutes of total time on the date of the encounter, counting the provider’s face-to-face and non-face-to-face work such as chart review, the visit, documentation, and care coordination. Clinical staff time does not count. If total time reaches 60 minutes, move to 99205.
Medical decision making and time. 99203 is low-complexity MDM and 30 to 44 minutes. 99204 is moderate-complexity MDM and 45 to 59 minutes. 99204 pays roughly $50 more per encounter, so the documentation has to support the moderate level or the claim is exposed to downcoding.
Not on its own. 99204 needs a modifier only when another service is billed the same day, such as modifier 25 for a separately identifiable E/M performed with a procedure or preventive visit, or modifier 95 for a telehealth encounter. On a standalone new patient visit, no modifier is required.
Yes. 99204 is strictly a new patient code. A patient not seen by your group’s same specialty in three years is new. Anyone seen within that window is established and should be billed with an established code such as 99214. Using a new-patient code for an established patient triggers denials.
G2211 is a Medicare visit-complexity add-on for providers who serve as the continuing focal point for a patient’s care. It can add roughly $16 to $19 to a qualifying 99204 visit. You cannot bill G2211 with modifier 25 unless the paired service is a Part B preventive service, immunization, or annual wellness visit.
Yes, if a significant, separate problem is addressed during a new-patient checkup. Bill the preventive code for the well visit and 99204 with modifier 25 for the problem, each with its own diagnosis and its own note. A trivial finding handled inside the checkup does not justify a separate E/M.
Both require moderate MDM, but 99204 pays more because a new patient workup demands additional effort. Under the 2026 Medicare fee schedule, 99204 carries a work RVU of 2.60 versus 1.80 for 99214, translating to a meaningful per-visit payment difference that compounds across your new-patient volume.
Next Steps
Review your last 90 days of new-patient visits and check how many were coded as 99203 when the documentation supported 99204. That gap is your most immediate revenue recovery opportunity.
If your billing team is not confident distinguishing moderate from low MDM, or if new-patient E/M denials are showing up on your remittances, a specialized pediatric billing partner can audit the pattern and fix it.
New patient E/M coding is where pediatric practices most often under-bill, and payers audit level 4 visits closely. If you want your 99204 claims coded accurately and paid in full, the right billing partner pays for itself. Billing Service Quotes matches pediatric practices with vetted billing companies across all 50 states, with rates starting as low as 2.95%, and matching is always free for providers.
