'Power BI Column showing T/F

I am looking to create a column in Power BI that will display a T/F only on the first instance of a [Patient_ID]. However, I also want to include a filter to only show the ones which have a [Visit_Status_Code] of CHK. I have attempted a few different iterations, and here is what I have so far. It is not excluding the other status codes, as I need it to.

New_Pt? = 
    COUNTROWS(
        FILTER(
            'Appointments',
            Appointments[Patient_ID] = EARLIER(Appointments[Patient_ID]) &&
            Appointments[Visit_Status_Code] = "CHK"
        )
    ) =1

I would appreciate any help seeing where my errors are

powerbi powerbi-desktop

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'Power BI Column showing T/F

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