• You can brush up on the basics of signature requirements -- and avoid denials -- with a new tool from one regional home health intermediary. For example: Stamped signatures are never acceptable for Medicare documents, RHHI Cahaba GBA reminds providers in a new quick reference tool. But faxed and electronic signatures are OK. The new tool also goes over attestation requirements. The tool is online at www.cahabagba.com/rhhi/education/materials/quick_signature.pdf.