99203 vs 99204: new patient E/M coding explained

Bill 99203 for a new patient visit with low medical decision making or 30 to 44 minutes of total time. Bill 99204 for moderate medical decision making or 45 to 59 minutes. A patient counts as new only if no clinician of the same specialty and subspecialty in your group has provided a face-to-face service within the previous three years. 99203 carries 1.60 work RVUs, 99204 carries 2.60.

New patient visits pay meaningfully more than their established equivalents, and the error rate on leveling them is higher. The reason is a specific cognitive trap: intake work feels substantial, which tempts coders upward, while the 2021 MDM rules ignore history and examination entirely and pull the level back down. Two codes, one rule set, and a persistent mismatch between effort and reimbursement.

First: is the patient actually new?

The three-year rule decides everything before leveling begins, and getting it wrong is expensive in both directions.

A patient is established if any physician or qualified health professional of the exact same specialty and subspecialty within your group practice has provided a face-to-face professional service in the preceding 36 months. Location is irrelevant. Group and specialty are what matter. A patient seen by your practice’s cardiologist three months ago is new to your endocrinologist and established to your other cardiologist.

Bill a new patient code for an established patient and you invite a denial, because the payer’s own eligibility history disagrees with you. Bill an established code for a genuinely new patient and you simply lose the difference, silently, forever. This check sits inside our claim scrubbing services precisely because payer eligibility files usually reveal the prior relationship before the claim leaves the building, and eligibility verification flags it at scheduling, which is earlier and cheaper.

99203 vs 99204 at a glance

Factor	99203	99204
MDM level required	Low	Moderate
Total time on encounter date	30 to 44 min	45 to 59 min
Work RVUs	1.60	2.60
Approximate 2026 office payment	Roughly $50 to $55 below 99204	Approximately $177 (5.31 total RVUs at $33.4009)
Everyday anchor	One uncomplicated problem, minimal workup	Prescription started plus data ordered and reviewed
Automatic downcode exposure	None	Cigna R49, Aetna coding accuracy review

A note on the dollar figures, because honesty is more useful here than false precision. Work RVUs and time thresholds are fixed and reliable. Published 2026 payment estimates for the new patient codes vary noticeably between secondary sources, more so than for the established codes, so treat any figure you read online as indicative only and pull your own through the CMS Physician Fee Schedule lookup using your locality and place of service. The direction of travel is not in doubt: office-based payment rose for 2026 and facility payment fell, under the practice expense reallocation in the CY2026 final rule.

The MDM table itself is defined in the AMA E/M guidelines and works identically to the established patient codes covered in 99213 versus 99214. G2211 may also apply on qualifying visits where you become the continuing focal point of care, adding roughly $16 to $19, though not alongside modifier 25 unless the paired service is preventive.

Worked examples

Correctly 99203

New patient, mild seasonal allergic rhinitis, no comorbidities, over-the-counter antihistamine recommended, no testing, no prescription. One acute uncomplicated illness, minimal data, low risk. Level 3.

Correctly 99204

New patient, newly diagnosed hypertension. Lisinopril started, comprehensive metabolic panel and ECG ordered and interpreted, lifestyle counseling documented, six-week follow-up arranged. Undiagnosed new problem with uncertain prognosis, moderate data, prescription management. Moderate across all three elements.

The tempting overcode

Healthy new patient, thorough forty-minute intake, extensive history, unremarkable examination, no prescriptions, no orders. The comprehensive history feels like level 4 work, and in a pre-2021 world it would have been. MDM here is straightforward to low, and forty minutes sits inside the 99203 window. Bill 99203. Time rescues this visit only at 45 documented minutes or more.

The missed 99204

New patient transferring care with two stable chronic conditions. Records reviewed from the prior physician, both maintenance prescriptions continued after documented evaluation of current control, no changes needed. Two chronic problems, external record review, prescription management. That is a defensible 99204 that a great many practices reflexively code 99203, on the reasoning that nothing changed. Nothing changing is a clinical outcome, not an absence of decision making, provided the note records the evaluation behind it.

Documentation habits that make new patient levels stick

1. State that the patient is new and, where the relationship is ambiguous, that no clinician of your specialty in the group has seen them within three years.
2. For 99204, name the prescription decision and the specific data reviewed. Transferring-care visits should reference the outside records actually examined, by source.
3. If coding on time, record total minutes including pre-visit record review performed on the encounter date, and say what the time comprised.
4. Resist template history bloat. Auditors and payer algorithms both level on decisions, and a long note attached to thin MDM is precisely the mismatch that downcoding edits are built to detect.

New patient codes are now a downcoding target

99204 and 99205 sit squarely inside the scope of Cigna’s R49 policy, effective 1 October 2025, which reduces level 4 and 5 office visit codes by one level where the submitted information does not appear to support the complexity billed. Aetna operates a comparable clinical review program. Both pay the claim rather than denying it, so the reduction never appears in a denial report.

For new patient visits this stings more than for established ones, because the per-encounter difference is larger and because a practice growing its new patient volume is exactly the practice least likely to be auditing remittances line by line. The control is simple and unglamorous: reconcile the CPT submitted against the CPT paid, every remittance, then appeal with documentation attached. Reductions are recoverable through denial management, and regulators have begun intervening, with Maryland fining Cigna $80,000 in March 2026 and ordering automatic downcoding to stop.

New patient coding accuracy is a team discipline spanning scheduling, eligibility, and coding rather than something settled at the end of a note, which is why it lives inside our medical coding services and clinic and physician group RCM. If new patient volume is growing and you want to be certain the revenue is following, request a proposal.

Frequently asked questions