What areCDT codes?What providers uses them?

Answer 1

These are dental procedure codes used in billing and other dental office paperwork/computer entry.

From-
http://privacy.med.miami.edu/glossary/xd_cdt_codes.htm

"The American Dental Association's Code on Dental Procedures and Nomenclature (CDT) is used to record and report dental procedures. It is the dental equivalent of Current Procedure Terminology (CPT) codes for other-than-dental procedures. (Hence the ADA's choice of the official abbreviation CDT rather than CDPN.)"

Manuals may be purchased at-
http://www.ada.org/prof/resources/topics/cdt/manual.asp