diff --git a/src/models.py b/src/models.py
new file mode 100644
index 0000000..f9c0cea
--- /dev/null
+++ b/src/models.py
@@ -0,0 +1,36 @@
+from pydantic import BaseModel, Field
+from datetime import date, datetime
+
+from pydantic_core import Url
+
+class AttributeData(BaseModel):
+    attributeName: str
+    attributeValue: list[str]
+
+class LinkData(BaseModel):
+    href: Url
+    rel: str
+    type: str
+
+class ConceptCodeData(BaseModel):
+    attributes: list[AttributeData]
+    beginDate: date = Field(...)
+    classificationId: str
+    classificationName: str
+    conceptCodeId: str
+    createDate: datetime
+    expirationDate: date
+    lastModifiedBy: str
+    lastModifiedDate: datetime
+    links: list[LinkData]
+    status: str
+    versionId: str
+    versionName: str
+
+class Data(BaseModel):
+    conceptCodes: list[ConceptCodeData]
+    links: list[LinkData]
+    page: int
+    pageSize: int
+    totalItems: int
+    totalPages: int
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