The Companion Guide provided here contains information regarding the following transactions; the 837 claim format, the 835 remittance notice, the 276/277 transaction, and the National Council for Prescription Drug Programs (NCPDP) claim format. This is intended as a reference to be used in addition to the ANSI ASC X12 Implementation Guides and NCPDP reference documents. The ANSI X12 implementation guides can be downloaded for a fee at www.wpc-edi.com 
and the NCPDP reference documents can be downloaded for a fee at www.ncpdp.org . This reference addresses only Medicare DMEPOS specific information.
