diff --git a/erpnext/healthcare/doctype/patient_appointment/patient_appointment.js b/erpnext/healthcare/doctype/patient_appointment/patient_appointment.js
index 2d6b64532b1..79e1775b9db 100644
--- a/erpnext/healthcare/doctype/patient_appointment/patient_appointment.js
+++ b/erpnext/healthcare/doctype/patient_appointment/patient_appointment.js
@@ -22,6 +22,7 @@ frappe.ui.form.on('Patient Appointment', {
 				filters: {'status': 'Active'}
 			};
 		});
+
 		frm.set_query('practitioner', function() {
 			return {
 				filters: {
@@ -29,6 +30,7 @@ frappe.ui.form.on('Patient Appointment', {
 				}
 			};
 		});
+
 		frm.set_query('service_unit', function(){
 			return {
 				filters: {
@@ -39,6 +41,16 @@ frappe.ui.form.on('Patient Appointment', {
 			};
 		});
 
+		frm.set_query('therapy_plan', function() {
+			return {
+				filters: {
+					'patient': frm.doc.patient
+				}
+			};
+		});
+
+		frm.trigger('set_therapy_type_filter');
+
 		if (frm.is_new()) {
 			frm.page.set_primary_action(__('Check Availability'), function() {
 				if (!frm.doc.patient) {
@@ -136,6 +148,24 @@ frappe.ui.form.on('Patient Appointment', {
 		}
 	},
 
+	therapy_plan: function(frm) {
+		frm.trigger('set_therapy_type_filter');
+	},
+
+	set_therapy_type_filter: function(frm) {
+		if (frm.doc.therapy_plan) {
+			frm.call('get_therapy_types').then(r => {
+				frm.set_query('therapy_type', function() {
+					return {
+						filters: {
+							'name': ['in', r.message]
+						}
+					};
+				});
+			});
+		}
+	},
+
 	therapy_type: function(frm) {
 		if (frm.doc.therapy_type) {
 			frappe.db.get_value('Therapy Type', frm.doc.therapy_type, 'default_duration', (r) => {
diff --git a/erpnext/healthcare/doctype/patient_appointment/patient_appointment.json b/erpnext/healthcare/doctype/patient_appointment/patient_appointment.json
index ac35acc21ac..35600e48092 100644
--- a/erpnext/healthcare/doctype/patient_appointment/patient_appointment.json
+++ b/erpnext/healthcare/doctype/patient_appointment/patient_appointment.json
@@ -23,9 +23,9 @@
   "procedure_template",
   "get_procedure_from_encounter",
   "procedure_prescription",
+  "therapy_plan",
   "therapy_type",
   "get_prescribed_therapies",
-  "therapy_plan",
   "practitioner",
   "practitioner_name",
   "department",
@@ -284,7 +284,7 @@
    "report_hide": 1
   },
   {
-   "depends_on": "eval:doc.patient;",
+   "depends_on": "eval:doc.patient && doc.therapy_plan;",
    "fieldname": "therapy_type",
    "fieldtype": "Link",
    "label": "Therapy",
@@ -292,17 +292,16 @@
    "set_only_once": 1
   },
   {
-   "depends_on": "eval:doc.patient && doc.__islocal;",
+   "depends_on": "eval:doc.patient && doc.therapy_plan && doc.__islocal;",
    "fieldname": "get_prescribed_therapies",
    "fieldtype": "Button",
    "label": "Get Prescribed Therapies"
   },
   {
-   "depends_on": "eval: doc.patient && doc.therapy_type",
+   "depends_on": "eval: doc.patient;",
    "fieldname": "therapy_plan",
    "fieldtype": "Link",
    "label": "Therapy Plan",
-   "mandatory_depends_on": "eval: doc.patient && doc.therapy_type",
    "options": "Therapy Plan"
   },
   {
@@ -348,7 +347,7 @@
   }
  ],
  "links": [],
- "modified": "2020-05-21 03:04:21.400893",
+ "modified": "2020-12-16 13:16:58.578503",
  "modified_by": "Administrator",
  "module": "Healthcare",
  "name": "Patient Appointment",
diff --git a/erpnext/healthcare/doctype/patient_appointment/patient_appointment.py b/erpnext/healthcare/doctype/patient_appointment/patient_appointment.py
index e685b20a8c8..dc820cb464e 100755
--- a/erpnext/healthcare/doctype/patient_appointment/patient_appointment.py
+++ b/erpnext/healthcare/doctype/patient_appointment/patient_appointment.py
@@ -91,6 +91,17 @@ class PatientAppointment(Document):
 		if fee_validity:
 			frappe.msgprint(_('{0} has fee validity till {1}').format(self.patient, fee_validity.valid_till))
 
+	def get_therapy_types(self):
+		if not self.therapy_plan:
+			return
+
+		therapy_types = []
+		doc = frappe.get_doc('Therapy Plan', self.therapy_plan)
+		for entry in doc.therapy_plan_details:
+			therapy_types.append(entry.therapy_type)
+
+		return therapy_types
+
 
 @frappe.whitelist()
 def check_payment_fields_reqd(patient):
@@ -145,7 +156,7 @@ def invoice_appointment(appointment_doc):
 		sales_invoice.flags.ignore_mandatory = True
 		sales_invoice.save(ignore_permissions=True)
 		sales_invoice.submit()
-		frappe.msgprint(_('Sales Invoice {0} created'.format(sales_invoice.name)), alert=True)
+		frappe.msgprint(_('Sales Invoice {0} created').format(sales_invoice.name), alert=True)
 		frappe.db.set_value('Patient Appointment', appointment_doc.name, 'invoiced', 1)
 		frappe.db.set_value('Patient Appointment', appointment_doc.name, 'ref_sales_invoice', sales_invoice.name)