Signature missing

If a record is identified for Medicare audit and there is no provider signature on a particular date of service, can the date be added prior to submission of the record? Does any note need to be added?

Basically, we're doing a pre-audit of the charts and discovered some dates of service not signed. In the Field Guide, I noticed it states Medicare does not require that office notes be signed. I thought a signature was required on each entry in the patient's medical record.

transmittal 327 - new

CMS Manual System
Department of Health &
Human Services (DHHS)
Pub 100-08 Medicare Program Integrity
Centers for Medicare &
Medicaid Services (CMS)
Transmittal 327
Date: March 16, 2010
Change Request 6698
SUBJECT: Signature Guidelines for Medical Review Purposes
I. SUMMARY OF CHANGES: Medicare claim review contractors (carriers, fiscal intermediaries (called affiliated contractors, or ACs), Medicare administrative contractors, the comprehensive error rate testing contractor, and recovery audit contractors ) are tasked with measuring, detecting and correcting improper payments in the fee for service Medicare program. These contractors review claims and medical documentation submitted by providers.
The previous language of the Program Integrity Manual required a legible identifier in the form of a handwritten or electronic signature for every service provided or ordered. This CR updates these requirements and adds e-prescribing language.
EFFECTIVE DATE: MARCH 1, 2010
IMPLEMENTATION DATE: April 16, 2010