Generate dynamic number of columns from CTE

A hospital database (SQL Server 2016) has a table of visits to the hospital. If patients transfer to a different specialty, a new visit is made (but from a research perspective it's considered one admission overall).

I've got the below CTE to join connected visits (gaps and islands problem) to form admissions (based on the admit/discharge time of the visit).

WITH cte1 AS (   SELECT      v.*,      PrevEnd = LAG(v.DischargeDate) OVER (PARTITION BY v.PatientID ORDER BY v.AdmitDate)   FROM Visits v),cte2 AS (   SELECT       *,      GroupId = COUNT(CASE WHEN cte1.PrevEnd >= DATEADD(hour, -6, cte1.AdmitDate) THEN NULL ELSE 1 END)            OVER (PARTITION BY cte1.PatientID ORDER BY cte1.AdmitDate ROWS UNBOUNDED PRECEDING)    FROM cte1),Numbered AS (   SELECT       *,      rn = ROW_NUMBER() OVER (PARTITION BY cte2.PatientID, cte2.GroupID ORDER BY cte2.AdmitDate)   FROM cte2)

The issue is I would like to create a dataset from this CTE, where there's a dynamic number of VisitID[n] columns based on the MAX(rn) FROM Numbered, instead of specifying each VisitID[n] column manually as I've done below:

SELECT   n.PatientID,    AdmitDate = MIN(n.AdmitDate),   DischargeDate = MIN(n.DischargeDate),   VisitID  = MIN(CASE WHEN n.rn = 1 THEN n.VisitID END),   VisitID2 = MIN(CASE WHEN n.rn = 2 THEN n.VisitID END),   VisitID3 = MIN(CASE WHEN n.rn = 3 THEN n.VisitID END),   VisitID4 = MIN(CASE WHEN n.rn = 4 THEN n.VisitID END)FROM Numbered nGROUP BY   n.PatientID,   n.GroupIDORDER BY   n.PatientID,   n.GroupID;

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The actual Numbered CTE result may have at least 20 connected visits.

I attempted to create a dynamic SQL string I could use exec on, by putting the CTE into a Temp table, but I was met with Error converting data type varchar to bigint.

DECLARE @maxVisitIDCount INT;DECLARE @columnNames NVARCHAR(MAX) = '';SELECT * INTO #tempVisitGrouped FROM NumberedSELECT @maxVisitIDCount = MAX(rn) FROM #tempVisitGrouped;SELECT @columnNames = @columnNames +'[VisitID'+ a.rn +'],' FROM (SELECT TOP (@maxVisitIDCount - 1) * FROM #tempVisitGrouped) AS a;

I thought I'd ask dba incase there's an easier way to do what I want. How can I generate the number of VisitID columns dynamically?