CMS publishes revalidation due dates for all providers enrolled with Medicare. Revalidation due dates are published six months in advance. The revalidation due date list is publicly available information. You may find the full data set on the CMS website shown below. For a quick glance to find out if your revalidation is currently due use the table excerpt below.
Click the magnifying glass below and enter your NPI number to search the CMS database for your revalidation due date. View the data directly from CMS at https://data.cms.gov/dataset/Revalidation-Due-Date-List/qtby-2amt