diff --git a/ci/code_checks.sh b/ci/code_checks.sh
index 82a2b0a9189af..e8a9963438648 100755
--- a/ci/code_checks.sh
+++ b/ci/code_checks.sh
@@ -574,9 +574,6 @@ if [[ -z "$CHECK" || "$CHECK" == "docstrings" ]]; then
         pandas.api.types.is_datetime64_ns_dtype \
         pandas.api.types.is_datetime64tz_dtype \
         pandas.api.types.is_integer_dtype \
-        pandas.api.types.is_interval_dtype \
-        pandas.api.types.is_period_dtype \
-        pandas.api.types.is_signed_integer_dtype \
         pandas.api.types.is_sparse \
         pandas.api.types.is_string_dtype \
         pandas.api.types.is_unsigned_integer_dtype \
diff --git a/pandas/core/dtypes/common.py b/pandas/core/dtypes/common.py
index 3be290ca2dfac..b87109473e470 100644
--- a/pandas/core/dtypes/common.py
+++ b/pandas/core/dtypes/common.py
@@ -398,9 +398,10 @@ def is_period_dtype(arr_or_dtype) -> bool:
 
     Examples
     --------
+    >>> from pandas.core.dtypes.common import is_period_dtype
     >>> is_period_dtype(object)
     False
-    >>> is_period_dtype(PeriodDtype(freq="D"))
+    >>> is_period_dtype(pd.PeriodDtype(freq="D"))
     True
     >>> is_period_dtype([1, 2, 3])
     False
@@ -434,9 +435,10 @@ def is_interval_dtype(arr_or_dtype) -> bool:
 
     Examples
     --------
+    >>> from pandas.core.dtypes.common import is_interval_dtype
     >>> is_interval_dtype(object)
     False
-    >>> is_interval_dtype(IntervalDtype())
+    >>> is_interval_dtype(pd.IntervalDtype())
     True
     >>> is_interval_dtype([1, 2, 3])
     False
@@ -727,6 +729,7 @@ def is_signed_integer_dtype(arr_or_dtype) -> bool:
 
     Examples
     --------
+    >>> from pandas.core.dtypes.common import is_signed_integer_dtype
     >>> is_signed_integer_dtype(str)
     False
     >>> is_signed_integer_dtype(int)