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00_copied_reference/medicine_lookup_checks/CheckPrescribingByVTM_3Months.sql

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+-- Snowflake version: Check prescribing by VTM for last 3 months
+-- Uses unified PrimaryCareMedication table (combines EMIS + TPP)
+-- Dynamically calculates date range from latest data
+
+WITH LatestDate AS (
+    SELECT DATEADD(DAY, 1, MAX("DateMedicationStart")::DATE) AS EndDate
+    FROM DATA_HUB.PHM."PrimaryCareMedication"
+    WHERE "DateMedicationStart" >= DATEADD(MONTH, -6, CURRENT_DATE())
+),
+DateRange AS (
+    SELECT
+        EndDate,
+        DATEADD(MONTH, -3, EndDate) AS StartDate
+    FROM LatestDate
+),
+SnomedCodes AS (
+    SELECT "ProductSnomedCode", "ProductDescription"
+    FROM DATA_HUB.DWH."DimMedicineAndDevice"
+    WHERE "TherapeuticMoietySnomedCode" = '775477008'  -- Tirzepatide VTM
+),
+AllPatients AS (
+    SELECT DISTINCT pcm."PatientPseudonym"
+    FROM DATA_HUB.PHM."PrimaryCareMedication" pcm
+    INNER JOIN SnomedCodes sc ON pcm."SNOMEDCode" = sc."ProductSnomedCode"
+    CROSS JOIN DateRange dr
+    WHERE pcm."DateMedicationStart" > dr.StartDate
+        AND pcm."DateMedicationStart" <= dr.EndDate
+        AND pcm."PatientPseudonym" IS NOT NULL
+)
+SELECT
+    COUNT(DISTINCT "PatientPseudonym") AS UniquePatientCount,
+    (SELECT StartDate FROM DateRange) AS StartDate,
+    (SELECT EndDate FROM DateRange) AS EndDate
+FROM AllPatients;