The ACGME is incharge of accrediting U.S. medical and surgical residencies. There are three decisions that can be made: Accreditation, probationary accreditation, or withdrawl of accreditation. The ACGME compiles an up-to-date list of residency programs under probation or with withdrawn accreditation in all specialties. I had previously reported on the list for 2012, but many of these programs have either dissolved or have been able to regain good standing with the ACGME. Rather than list all the current institutions on probation, a list which is always in flux, it is best to search the database yourself. You can search for all specialies, or by a single specialty. This is probably a very good thing to do when deciding where to apply.
Click here to search for programs under ACGME probationary accreditation
Click here to search for programs whose accreditation has been withdrawn