diff --git a/app/Http/Requests/BillingGroupRequest.php b/app/Http/Requests/BillingGroupRequest.php
new file mode 100644
index 0000000..6508795
--- /dev/null
+++ b/app/Http/Requests/BillingGroupRequest.php
@@ -0,0 +1,22 @@
+<?php
+
+namespace App\Http\Requests;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class BillingGroupRequest extends FormRequest
+{
+    public function rules(): array
+    {
+        return [
+            'name' => ['required'],
+            'description' => ['nullable'],
+            'is_active' => ['boolean'],
+        ];
+    }
+
+    public function authorize(): bool
+    {
+        return true;
+    }
+}
diff --git a/app/Http/Requests/BillingRadiologistRequest.php b/app/Http/Requests/BillingRadiologistRequest.php
new file mode 100644
index 0000000..80f334a
--- /dev/null
+++ b/app/Http/Requests/BillingRadiologistRequest.php
@@ -0,0 +1,21 @@
+<?php
+
+namespace App\Http\Requests;
+
+use Illuminate\Foundation\Http\FormRequest;
+
+class BillingRadiologistRequest extends FormRequest
+{
+    public function rules(): array
+    {
+        return [
+            'billing_group_id' => ['required', 'exists:billing_groups'],
+            'radiologist_id' => ['required', 'exists:users'],
+        ];
+    }
+
+    public function authorize(): bool
+    {
+        return true;
+    }
+}
diff --git a/app/Models/BillingGroup.php b/app/Models/BillingGroup.php
new file mode 100644
index 0000000..051b8db
--- /dev/null
+++ b/app/Models/BillingGroup.php
@@ -0,0 +1,15 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class BillingGroup extends Model
+{
+    protected function casts(): array
+    {
+        return [
+            'is_active' => 'boolean',
+        ];
+    }
+}
diff --git a/app/Models/BillingRadiologist.php b/app/Models/BillingRadiologist.php
new file mode 100644
index 0000000..6994cb0
--- /dev/null
+++ b/app/Models/BillingRadiologist.php
@@ -0,0 +1,19 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class BillingRadiologist extends Model
+{
+    public function billingGroup(): BelongsTo
+    {
+        return $this->belongsTo(BillingGroup::class);
+    }
+
+    public function radiologist(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'radiologist_id');
+    }
+}
diff --git a/database/migrations/2025_01_01_101623_create_billing_groups_table.php b/database/migrations/2025_01_01_101623_create_billing_groups_table.php
new file mode 100644
index 0000000..fb68434
--- /dev/null
+++ b/database/migrations/2025_01_01_101623_create_billing_groups_table.php
@@ -0,0 +1,24 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('billing_groups', function (Blueprint $table) {
+            $table->id();
+            $table->boolean('is_active')->index();
+            $table->string('name')->unique();
+            $table->text('description')->nullable();
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('billing_groups');
+    }
+};
diff --git a/database/migrations/2025_01_01_102957_create_billing_radiologists_table.php b/database/migrations/2025_01_01_102957_create_billing_radiologists_table.php
new file mode 100644
index 0000000..c838231
--- /dev/null
+++ b/database/migrations/2025_01_01_102957_create_billing_radiologists_table.php
@@ -0,0 +1,25 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('billing_radiologists', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('billing_group_id')->constrained('billing_groups')->nullOnDelete();
+            $table->foreignId('radiologist_id')->constrained('users')->nullOnDelete();
+            $table->timestamps();
+
+            $table->unique(['billing_group_id', 'radiologist_id']);
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('billing_radiologists');
+    }
+};