Add documentation for laboratory service requests and their charge items

Author: sonzsara

Care/Clinical/laboratory_service_request_with_their_chargeitems_ssmm.md

@@ -0,0 +1,38 @@
+# Laboratory Service Requests with Their Charge Items - SSMM
+
+> Distinct laboratory service requests mapped to their linked charge items
+
+## Purpose
+
+Lists each laboratory service request together with the charge item linked through the service request external id.
+
+## Parameters
+
+| Parameter | Type | Description | Example |
+|-----------|------|-------------|---------|
+| *(none)* | - | Query runs as a static report with fixed filters | - |
+
+---
+
+## Query
+
+```sql
+SELECT DISTINCT
+		emr_servicerequest.title AS service_title,
+		emr_servicerequest.category AS service_category,
+		emr_chargeitem.title AS charge_item_title
+FROM emr_servicerequest
+JOIN emr_chargeitem
+		ON emr_chargeitem.service_resource = 'service_request'
+	 AND emr_chargeitem.service_resource_id = emr_servicerequest.external_id::text
+WHERE emr_servicerequest.status != 'entered_in_error'
+	AND emr_servicerequest.category = 'laboratory'
+ORDER BY emr_servicerequest.category, emr_servicerequest.title;
+```
+
+## Notes
+
+- **Lab-only filter:** `emr_servicerequest.category = 'laboratory'` limits the output to laboratory requests.
+- Results are sorted by service category and service title.
+
+*Last updated: 2026-08-31*