diff --git a/src/clients/vitacore/schema.py b/src/clients/vitacore/schema.py
index c01d402..0923f20 100644
--- a/src/clients/vitacore/schema.py
+++ b/src/clients/vitacore/schema.py
@@ -640,7 +640,7 @@ class ProlongationModel(BaseModel):
 
 
 class PatientELNModel(BaseModel):
-    PatientSNILS: str = Field(
+    PatientSNILS: str | None = Field(
         title='СНИЛС болеющего', examples=['000-000-600 01']
     )
     Number: str = Field(