The list of encrypted, blanked and ranged LDS variables can be found under What are some limitations of each category of files?
Additional LDS files information can be found on the CMS web site: Limited Data Sets Non-identifiable Files Non-identifiable Files are aggregated data that for most instances are not covered by the Privacy Act as there is no beneficiary- or physician-level data in these files. Some of the files are summaries of information found in the Research Identifiable Files and some contain information that cannot be derived from any other source.
