diff --git a/cmd/main-migration/migrations/20251209022744.sql b/cmd/main-migration/migrations/20251209022744.sql
new file mode 100644
index 00000000..a8a18481
--- /dev/null
+++ b/cmd/main-migration/migrations/20251209022744.sql
@@ -0,0 +1,2 @@
+-- Modify "ChemoPlan" table
+ALTER TABLE "public"."ChemoPlan" ADD COLUMN "Encounter_Id" bigint NULL, ADD CONSTRAINT "fk_ChemoPlan_Encounter" FOREIGN KEY ("Encounter_Id") REFERENCES "public"."Encounter" ("Id") ON UPDATE NO ACTION ON DELETE NO ACTION;
diff --git a/cmd/main-migration/migrations/atlas.sum b/cmd/main-migration/migrations/atlas.sum
index 09459c64..ccfdf7cb 100644
--- a/cmd/main-migration/migrations/atlas.sum
+++ b/cmd/main-migration/migrations/atlas.sum
@@ -1,4 +1,4 @@
-h1:BsDkwn1AzNdKnOPVb6PkonyiXM7nTdVcjRdw62i/NlQ=
+h1:k6jcZ+rtVsLhO+oTPZVfHgwAInujs4C4iXNJlSwwkA8=
 20250904105930.sql h1:MEM6blCgke9DzWQSTnLzasbPIrcHssNNrJqZpSkEo6k=
 20250904141448.sql h1:J8cmYNk4ZrG9fhfbi2Z1IWz7YkfvhFqTzrLFo58BPY0=
 20250908062237.sql h1:Pu23yEW/aKkwozHoOuROvHS/GK4ngARJGdO7FB7HZuI=
@@ -147,4 +147,5 @@ h1:BsDkwn1AzNdKnOPVb6PkonyiXM7nTdVcjRdw62i/NlQ=
 20251205073858.sql h1:Ep03jQ9hJAJILDJfKVcmi3Z6fqmTHSq9gKQtwf070PE=
 20251205211957.sql h1:zRHcvLY+nfLdUyMcfpgI8vYQcPzJUWbfjkc4cK0QGHU=
 20251205214433.sql h1:tgHB/fNy9XwAOWIqNI6GCqGXeJgSuZs2aHiCEj3BHZA=
-20251205221124.sql h1:VthPlq3XcQOYz5VsFivb4Wof8jCAG36fAaerKmM4/OA=
+20251205221124.sql h1:wl56/lrR14r7LrScEKwTQ3cNE45wh/0Ye3UEM7gfVNg=
+20251209022744.sql h1:FayWjHhPEZEIq7KWIYaV/2/cmKB7A4PR3aspXXd6Brs=
diff --git a/internal/domain/main-entities/chemo-plan/entity.go b/internal/domain/main-entities/chemo-plan/entity.go
index 1f3f3ca5..2dc5a363 100644
--- a/internal/domain/main-entities/chemo-plan/entity.go
+++ b/internal/domain/main-entities/chemo-plan/entity.go
@@ -1,6 +1,7 @@
 package chemo_plan
 
 import (
+	ee "simrs-vx/internal/domain/main-entities/encounter"
 	"time"
 
 	ecore "simrs-vx/internal/domain/base-entities/core"
@@ -18,4 +19,6 @@ type ChemoPlan struct {
 	RealizationDate *time.Time              `json:"realizationDate"`
 	Notes           *string                 `json:"notes"`
 	Status          ere.StatusProtocolChemo `json:"status"`
+	Encounter_Id    *uint                   `json:"encounter_id"`
+	Encounter       *ee.Encounter           `json:"encounter,omitempty" gorm:"foreignKey:Encounter_Id;references:Id"`
 }