Think about it, it doesn't make sense. The patient becomes established to the provider for whatever the second "visit" was. As soon as they have seen them face to face for the 1st one they become established after that. The second one would be established even if it is on the same day.
30.6.7 - Payment for Office or Other Outpatient Evaluation and Management (E/M) Visits (Codes 99202 - 99215)(Rev. 12461; Issued:01-18-24; Effective:01-01-24 Implementation: 02-19-24)
A. Definition of New Patient for Selection of E/M Visit Code Interpret the phrase “new patient” to mean a patient who has not received any professional services, i.e., E/M service or other face-to-face service (e.g., surgical procedure) from the physician or physician group practice (same physician specialty) within the previous 3 years. For example, if a professional component of a previous procedure is billed in a 3 year time period, e.g., a lab interpretation is billed and no E/M service or other face-to-face service with the patient is performed, then this patient remains a new patient for the initial visit. An interpretation of a diagnostic test, reading an x-ray or EKG etc., in the absence of an E/M service or other face-to-face service with the patient does not affect the designation of a new patient.
B. Office/Outpatient E/M Visits Provided on Same Day for Unrelated Problems As for all other E/M services except where specifically noted, the Medicare Administrative Contractors (MACs) may not pay two E/M office visits billed by a physician (or physician of the same specialty from the same group practice) for the same beneficiary on the same day unless the physician documents that the visits were for unrelated problems in the office, off campus-outpatient hospital, or on campus-outpatient hospital setting which could not be provided during the same encounter (e.g., office visit for blood pressure medication evaluation, followed five hours later by a visit for evaluation of leg pain following an accident).
Also see these:
30.6.1.1 - Initial Preventive Physical Examination (IPPE) and AnnualWellness Visit (AWV)(Rev. 12546; Issued: 03-14-24; Effective: 05-15-24; Implementation: 05-15-24)
30.6.2 - Billing for Medically Necessary Visit on Same Occasion asPreventive Medicine Service(Rev. 12546; Issued: 03-14-24; Effective: 05-15-24; Implementation: 05-15-24)
I don't know which MAC you might be under but most have info on their sites like this:
Info from other plans as examples: