Medicare Claims Processing Manual (Pub. 100-04), Ch. 31 § 20.5
Transmission Mode
20.5 - Transmission Mode
(Rev. 2937, Issued; 04-25-14, Effective: 04-14-14, Implementation: 04-14-14)
The HIPAA compliant version of the ASC X12 276/277 claim status request and
response transaction is a variable-length record designed for wire transmission. The
CMS requires that the contractor accept the inbound and transmit the outbound over a
wire connection.