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+# Total Patients Registered 
+
+> Returns the count of registered patients with optional filtering by zone, frequency of visit, and cross-subsidy model
+
+## Purpose
+
+This query provides the total count of registered patients in Arike, allowing filtering by patient tags such as zone, frequency of visit, and cross-subsidy model.
+
+## Parameters
+
+| Parameter | Type | Description | Example |
+|-----------|------|-------------|---------|
+| `zone_filter` | TEXT | Filters by patient zone tag (parent_id: 55) | `Zone A` |
+| `frequency_filter` | TEXT | Filters by frequency of visit tag (parent_id: 18) | `Weekly` |
+| `cross_subsided_model_filter` | TEXT | Filters by cross-subsidy model tag (parent_id: 26) | `Fully supported` |
+
+
+
+---
+
+## Query
+
+```sql
+WITH patient_tags AS (
+    SELECT
+        ep.id AS patient_id,
+        MAX(CASE WHEN et.parent_id = 55 THEN et.display END) AS zone,
+        MAX(CASE WHEN et.parent_id = 18 THEN et.display END) AS frequency_of_visit,
+        MAX(CASE WHEN et.parent_id = 26 THEN et.display END) AS cross_subsided_model
+    FROM emr_patient ep
+    LEFT JOIN LATERAL unnest(ep.instance_tags) AS tag_id ON TRUE
+    LEFT JOIN emr_tagconfig et
+        ON et.id = tag_id
+       AND et.deleted = FALSE
+       AND et.parent_id IN (55, 18, 26)
+    WHERE ep.deleted = FALSE
+    GROUP BY ep.id
+)
+
+SELECT COUNT(*) AS count
+FROM emr_patient ep
+LEFT JOIN patient_tags pt ON pt.patient_id = ep.id
+WHERE ep.deleted = FALSE
+--   [[AND (pt.zone) = ({{zone_filter}})]]
+--   [[AND (pt.frequency_of_visit) = ({{frequency_filter}})]]
+--   [[AND (pt.cross_subsided_model) = ({{cross_subsided_model_filter}})]];
+```
+
+
+## Drill-Down Query
+
+Returns detailed patient information including demographics, identifiers, and all associated tags.
+
+### Additional Parameters
+
+| Parameter | Type | Description | Example |
+|-----------|------|-------------|---------|
+| `patient_name` | TEXT | Filters by patient name | `'John'` |
+| `alerts_filter` | TEXT | Filters by alert tags (parent_id: 47) | `JIC Box` |
+| `special_note_filter` | TEXT | Filters by special note tags (parent_id: 22) | `Two staff required` |
+| `others_filter` | TEXT | Filters by other specific tags (ids: 66, 67, 68) | `Collusion` |
+
+```sql
+WITH patient_tags AS (
+    SELECT
+        ep.id AS patient_id,
+        MAX(CASE WHEN et.parent_id = 55 THEN et.display END) AS zone,
+        MAX(CASE WHEN et.parent_id = 47 THEN et.display END) AS alerts,
+        MAX(CASE WHEN et.parent_id = 18 THEN et.display END) AS frequency_of_care,
+        MAX(CASE WHEN et.parent_id = 22 THEN et.display END) AS special_note,
+        MAX(CASE WHEN et.parent_id = 26 THEN et.display END) AS cross_subsided_model,
+        MAX(CASE WHEN et.id IN (66, 67, 68) THEN et.display END) AS others
+    FROM emr_patient ep
+    LEFT JOIN LATERAL unnest(ep.instance_tags) AS tag_id ON TRUE
+    LEFT JOIN emr_tagconfig et 
+        ON et.id = tag_id 
+        AND et.deleted = FALSE
+        AND (
+            et.parent_id IN (55, 47, 18, 22, 26)
+            OR et.id IN (66, 67, 68)
+        )
+    WHERE ep.deleted = FALSE
+    GROUP BY ep.id
+)
+
+SELECT 
+    ep.name,
+    ep.phone_number,
+    ep.year_of_birth,
+    ep.gender,
+    pi.value AS ADM,
+    ep.created_date,
+    pt.zone,
+    pt.alerts,
+    pt.others,
+    pt.frequency_of_care,
+    pt.special_note,
+    pt.cross_subsided_model
+FROM emr_patient ep
+LEFT JOIN emr_patientidentifier pi 
+    ON ep.id = pi.patient_id 
+    AND pi.config_id = 2
+LEFT JOIN patient_tags pt 
+    ON pt.patient_id = ep.id
+WHERE ep.deleted = FALSE
+--   [[AND {{patient_name}}]]
+--   [[AND (pt.zone) = ({{zone_filter}})]]
+--   [[AND (pt.alerts) = ({{alerts_filter}})]]
+--   [[AND (pt.frequency_of_care) = ({{frequency_filter}})]]
+--   [[AND (pt.special_note) = ({{special_note_filter}})]]
+--   [[AND (pt.cross_subsided_model) = ({{cross_subsided_model_filter}})]]
+--   [[AND (pt.others) = ({{others_filter}})]]
+ORDER BY ep.name ASC
+
+```
+
+## Notes
+
+- Only non-deleted patients (`ep.deleted = FALSE`) and tags (`et.deleted = FALSE`) are included
+- The query uses `LATERAL unnest()` to expand the `instance_tags` array for joining with tag configurations
+- Hardcoded tag parent IDs:
+  - `55`: Zone tags
+  - `47`: Alert tags
+  - `18`: Frequency of visit/care tags
+  - `22`: Special note tags
+  - `26`: Cross-subsidy model tags
+  - Specific tag IDs `66, 67, 68`: Other classifications
+- Patient identifier `config_id = 2` represents ADM (Admission Number)
+
+
+*Last updated: 2025-12-17*