The X12 834 EDI Enrollment Implementation Format is a standard file format in the United States for electronically exchanging health plan enrollment data between employers and health insurance carriers.
An 834 file contains a string of data elements, with each representing a fact, such as a subscriber’s name, hire date, etc.
The entire string is called a transaction set.
The 834 is used to transfer enrollment information from the sponsor of the insurance coverage, benefits, or policy to a payer.
The format attempts to meet the health care industry's specific need for the initial enrollment and subsequent maintenance of individuals who are enrolled in insurance products.