What does the filename structure mean?

The API returns a list of file names with the following structure:



  • AA = the two character prefix that designates the type of file
  • nnnnnn = the six digit submitter ID
  • XX = the two character extension that separates files. Files begin with the prefix AA, AB, AC….A0, A1, A2…..BA, BB, BC…..ending with W9 before rolling back to AA (excluding the AU, BK, DB, DV, GI, GW, HT, JS, QT, RA, RP and WM prefixes as these are reserved).

The most common reports are the Claim Status Response (X3) and the Claim Remittance (R5). Electronic reports also exist to support all available transactions, including medical statements and Electronic Remittance Advice (ERA).

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