Re: Has anybody sent Certified letter to DDS?
Yep, SS as well as thousands of other entities (magazines, credit cards, insurance payments, hospital bills, cable bills, city taxes, etc) outsource things like receipt of mail and payments. So if you send it certified to SS, there are no SS employees there to sign for it. So it can end up in limbo because XYZ Co that does the processing is not in a position to sign for something as if they were SS.
Also, when paying a bill never include any other correspondence in the envelope with your payment. For example, if you are paying a doctor the $50 you owe him and you want a copy of your medical records, never include your request in the same envelope as your payment. Payments go to a processing center and not the doctor's office (often specialty centers "Lock Box" as it accepts and immediately secures checks and payment methods like Credit Card info you put on a bill). Your request for medical records, in a case like that, gets put in limbo or disappears.
AND never expect to be able to send something certified or overnight mail to what may be a third party mail processor. You are much better off sending it to the requester in the exact envelope received (or if too large for the envelope then copying that exact address onto a larger envelope) and ALWAYS KEEP copies for yourself (writing on your copy on the top "sent on 3/15/12".
Rt thumb fusion '13. R&L thumb arthroplasty '12 ; RT TKR & Bilat CTS' 11. Fusions: L5-S1('87), L4-S1('93), C5-C7('06), L3-S1('10), C4-C5('13). C5-C7 foraminotomy '08