This X12 Transaction Set contains the format and establishes the data contents of the Health Care Claim Payment/Advice Transaction Set (835) for use within the context of the Electronic Data Interchange (EDI) environment. This transaction set can be used to make a payment, send an Explanation of Benefits (EOB) remittance advice, or make a payment and send an EOB remittance advice only from a health insurer to a health care provider either directly or via a financial institution.