diff --git a/lims_management/__manifest__.py b/lims_management/__manifest__.py
index 71c4ec4..e3116fd 100644
--- a/lims_management/__manifest__.py
+++ b/lims_management/__manifest__.py
@@ -20,6 +20,7 @@
     'data': [
         'security/lims_security.xml',
         'security/ir.model.access.csv',
+        'data/ir_sequence.xml',
         'views/menus.xml',
         'views/partner_views.xml',
     ],
diff --git a/lims_management/data/ir_sequence.xml b/lims_management/data/ir_sequence.xml
new file mode 100644
index 0000000..1bb0b3c
--- /dev/null
+++ b/lims_management/data/ir_sequence.xml
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<odoo>
+    <data noupdate="1">
+        <!-- Secuencia para el Identificador de Paciente -->
+        <record id="seq_patient_identifier" model="ir.sequence">
+            <field name="name">Patient Identifier Sequence</field>
+            <field name="code">res.partner.patient_identifier</field>
+            <field name="prefix">P</field>
+            <field name="padding">6</field>
+            <field name="company_id" eval="False"/>
+        </record>
+    </data>
+</odoo>
diff --git a/lims_management/data/lims_demo.xml b/lims_management/data/lims_demo.xml
index c373c56..145c6d7 100644
--- a/lims_management/data/lims_demo.xml
+++ b/lims_management/data/lims_demo.xml
@@ -6,7 +6,8 @@
         <record id="demo_patient_1" model="res.partner">
             <field name="name">Ana Torres</field>
             <field name="is_patient" eval="True"/>
-            <field name="patient_identifier">P0001</field>
+            <field name="patient_identifier">P-A87B01</field>
+            <field name="origin">Carga Inicial</field>
             <field name="birthdate_date">1985-05-15</field>
             <field name="gender">female</field>
             <field name="phone">+1-202-555-0174</field>
@@ -16,7 +17,8 @@
         <record id="demo_patient_2" model="res.partner">
             <field name="name">Carlos Ruiz</field>
             <field name="is_patient" eval="True"/>
-            <field name="patient_identifier">P0002</field>
+            <field name="patient_identifier">P-C45D02</field>
+            <field name="origin">Carga Inicial</field>
             <field name="birthdate_date">1992-11-20</field>
             <field name="gender">male</field>
             <field name="phone">+1-202-555-0192</field>
diff --git a/lims_management/models/partner.py b/lims_management/models/partner.py
index e691ffe..f90bc73 100644
--- a/lims_management/models/partner.py
+++ b/lims_management/models/partner.py
@@ -6,6 +6,11 @@ class ResPartner(models.Model):
 
     is_patient = fields.Boolean(string="Es Paciente")
     patient_identifier = fields.Char(string="Identificador de Paciente", copy=False)
+    origin = fields.Char(
+        string="Origen",
+        default='Manual',
+        help="Este campo indica el origen del registro del paciente (ej. Manual, Carga Inicial)."
+    )
     birthdate_date = fields.Date(string="Fecha de Nacimiento")
     gender = fields.Selection([
         ('male', 'Masculino'),
@@ -20,3 +25,10 @@ class ResPartner(models.Model):
         ('patient_identifier_unique', 'unique(patient_identifier)', 'El identificador del paciente debe ser único.'),
         ('doctor_license_unique', 'unique(doctor_license)', 'La licencia médica debe ser única.')
     ]
+
+    @api.model_create_multi
+    def create(self, vals_list):
+        for vals in vals_list:
+            if vals.get('is_patient') and not vals.get('patient_identifier'):
+                vals['patient_identifier'] = self.env['ir.sequence'].next_by_code('res.partner.patient_identifier')
+        return super(ResPartner, self).create(vals_list)
diff --git a/lims_management/views/partner_views.xml b/lims_management/views/partner_views.xml
index de3e73b..4610484 100644
--- a/lims_management/views/partner_views.xml
+++ b/lims_management/views/partner_views.xml
@@ -12,7 +12,8 @@
                         <group>
                             <group>
                                 <field name="is_patient"/>
-                                <field name="patient_identifier" invisible="not is_patient"/>
+                                <field name="patient_identifier" invisible="not is_patient" readonly="patient_identifier"/>
+                                <field name="origin" readonly="id" invisible="not is_patient"/>
                                 <field name="birthdate_date" invisible="not is_patient"/>
                                 <field name="gender" invisible="not is_patient"/>
                             </group>