SELECT
    [Table Name] = OBJECT_NAME(c.object_id),
    [Column Name] = c.name,
    [Description] = ex.value
FROM
    sys.columns c
LEFT OUTER JOIN
    sys.extended_properties ex
ON
    ex.major_id = c.object_id
    AND ex.minor_id = c.column_id
    AND ex.name = 'MS_Description'  AND class_desc = 'OBJECT_OR_COLUMN'
WHERE c.object_id = object_id('repKPIByMonth')
ORDER  BY OBJECT_NAME(c.object_id), c.column_id