diff --git a/lms/migrations/versions/9e79650bed37_backfill_lms_course_application_instance.py b/lms/migrations/versions/9e79650bed37_backfill_lms_course_application_instance.py
new file mode 100644
index 0000000000..ebdd6b0da2
--- /dev/null
+++ b/lms/migrations/versions/9e79650bed37_backfill_lms_course_application_instance.py
@@ -0,0 +1,43 @@
+"""LMSCourseApplicationInstance backfill."""
+
+import sqlalchemy as sa
+from alembic import op
+
+revision = "9e79650bed37"
+down_revision = "e13fb37c96e5"
+
+
+def upgrade() -> None:
+    conn = op.get_bind()
+    conn.execute(
+        sa.text(
+            """
+        WITH backfill as (
+            SELECT
+                "grouping".created,
+                "grouping".updated,
+                lms_course.id lms_course_id,
+                "grouping".application_instance_id
+            FROM "grouping"
+            JOIN lms_course on lms_course.h_authority_provided_id = "grouping".authority_provided_id
+        )
+        INSERT INTO lms_course_application_instance (
+             created,
+             updated,
+             lms_course_id,
+             application_instance_id
+        )
+        SELECT
+           created,
+           updated,
+           lms_course_id,
+           application_instance_id
+        FROM backfill
+        ON CONFLICT (lms_course_id, application_instance_id) DO NOTHING
+    """
+        )
+    )
+
+
+def downgrade() -> None:
+    pass