The three-year new-patient rule, including the group-practice wrinkles

When does a patient count as new again?

A patient is new if they have not received a face-to-face professional service — a billable evaluation and management visit or procedure furnished personally by a physician, nurse practitioner, or physician assistant — from you, or from any other clinician of the exact same specialty and subspecialty in your same group practice, within the past three years. Once three full years pass since that last service, the same patient becomes new again on their next visit, even if you've treated them for a decade in total.

The three-year test is the antecedent step to E/M level selection under the current framework: new-patient visits (99202-99205) and established-patient visits (99212-99215) are different code families entirely, each with its own level-setting requirements under the 2021 MDM table, so getting the new-versus-established call right comes before medical decision making or time even enters the picture 1Ref 1Centers for Medicare & Medicaid Services (2023).Evaluation and Management Services Guide.That E/M office-visit levels are selected by medical decision making or total time under the 2021+ framework, which governs level-setting only once the new-versus-established code family has been correctly determined — the antecedent step this article teaches.2Ref 2American Medical Association (2023).CPT evaluation and management (E/M) revisions.That the AMA's 2021 E/M revisions set medical decision making or total time as the level-setting method for office visits, applying equally to the new-patient and established-patient code families once the correct family is chosen..

The three-year clock: how to count it

The three years run from the date of the last qualifying face-to-face service to the date of the current visit, not from January 1 of any calendar year and not from when the patient was first seen. A patient last seen on March 10, 2023 becomes new again only on March 11, 2026 or later — a visit one week short of the three-year mark still counts as established, even if it feels like ancient history in the chart.

This is a common place solos miscode in both directions: billing a patient as new too early, before the three years have actually elapsed, or billing a long-absent patient as established out of familiarity, when the clock has, in fact, reset.

Same specialty, same subspecialty: what CPT actually means by it

Same specialty and subspecialty is CPT's own defined classification, not a description of what a clinician does in practice day to day — the AMA's E/M framework treats it as a fixed designation question, separate from whichever level of MDM or time a specific visit involves 1Ref 1Centers for Medicare & Medicaid Services (2023).Evaluation and Management Services Guide.That E/M office-visit levels are selected by medical decision making or total time under the 2021+ framework, which governs level-setting only once the new-versus-established code family has been correctly determined — the antecedent step this article teaches.2Ref 2American Medical Association (2023).CPT evaluation and management (E/M) revisions.That the AMA's 2021 E/M revisions set medical decision making or total time as the level-setting method for office visits, applying equally to the new-patient and established-patient code families once the correct family is chosen.. Two clinicians who both describe themselves informally the same way — family medicine, psychiatry — can still be classified differently if their registered specialty designation differs, which is exactly the distinction group practices need to track.

That designation is what shows up on the claim itself: the rendering clinician's specialty information is entered in a specific field on the CMS-1500 form, per NUCC's own item-by-item completion instructions for that form 3Ref 3National Uniform Claim Committee (2026).1500 Claim Form.That the NUCC maintains the 1500 claim form and its official instruction manual, including item-by-item completion instructions — supports that a clinician's registered specialty designation is reported in a specific field on the claim form itself, which is what a payer's system references when comparing clinicians in the same group practice., which is the same information a payer's system checks when comparing two clinicians in the same group practice against each other.

The group-practice wrinkle: adding a second clinician

The moment a solo practice becomes a group — adding clinician #2, whether a colleague, an NP, or a PA — is exactly when this rule starts mattering in a way it didn't before, since a true solo has no one else's specialty designation to compare against. Once a second clinician joins, every existing patient who has never seen that specific person is new to them on their first visit, unless that clinician shares the exact same specialty and subspecialty designation as someone the patient has already seen within three years.

Getting this wrong in the transition from solo to group is easy: treating every existing patient as automatically established with the new clinician, because they're established with the practice, is the single most common version of this coding error.

What actually resets the clock, and what doesn't

Only a face-to-face professional service furnished personally by the physician, NP, or PA counts — a billable E/M visit, a procedure the clinician performed, or an equivalent encounter. A portal message answered by the clinician, a phone call triaged entirely by nursing or administrative staff, or a lab result reviewed without an accompanying billable encounter does not reset the three-year clock, because none of those is the kind of professional service the definition requires.

This matters most for practices that stay in loose contact with patients between visits — a patient who has exchanged portal messages every few months but hasn't had an actual billable visit in three-plus years is, for coding purposes, new again on the next visit, regardless of how continuous the relationship has felt from either side.

Coding it wrong in either direction

Billing an established-patient code for someone who actually qualifies as new underbills the visit — new-patient codes generally reflect the additional work of a first encounter, so treating a genuinely new patient as established leaves money on the table on top of being incorrect. Billing a new-patient code for someone who doesn't qualify is the more audit-relevant error, since it overbills relative to what was actually a return visit.

Both directions trace back to the same fix: checking the date of the patient's last qualifying service and the treating clinician's registered specialty designation before defaulting to whatever felt intuitively correct.

Documenting the call so it survives a chart pull

Noting the basis for a new-patient designation in the chart — the absence of any qualifying visit within three years, or the specialty distinction if a group-practice clinician change is involved — turns a coding decision into something a reviewer can verify rather than take on faith. This is a small addition to the intake flow, not a burdensome one: a note that the patient's last visit predates the three-year window, or that they are being seen by a different-specialty clinician for the first time, closes the exact question a records request on this code family would ask.