Build an X12 834 benefit enrollment transaction for a new hire group enrollment event and handle the subscriber and dependent demographic and coverage loops correctly

Verified steps

1. Open the 834 with the BGN segment carrying the transaction set purpose code of 00 for original or 15 for change, the original file creation date and time, the sender's file identifier, and the transmission type code indicating full file or change only to prevent the carrier from processing the transaction as a duplicate
2. Build the 1000A sponsor name loop using N1*P5 to identify the employer sponsor and the 1000B payer loop using N1*IN to identify the insurance carrier; include REF segments with the plan-specific group contract number and the master policy number required by the carrier's implementation guide
3. For each subscriber, create a 2000 INS loop with INS01 set to Y for the subscriber, INS02 carrying the relationship code, INS03 carrying the maintenance type code such as 021 for new enrollment, and INS04 carrying the maintenance reason code appropriate for the enrollment event
4. Populate the 2100A member name NM1 loop and the 2100B incorrect member name loop only if a name correction is being processed; populate the 2300 health coverage loop with HD segments specifying the coverage type code, coverage level, and plan-specific benefit description code
5. For each dependent of the subscriber, build a 2000 INS loop with INS01 set to N and a relationship code in INS02 identifying spouse or child relationship; share the same 2300 health coverage HD segment coverage type as the subscriber if they are enrolled in the same coverage tier
6. Close each subscriber's enrollment record by populating the DTP segments in the 2300 loop with the benefit begin date in DTP03; verify that the benefit begin date matches the eligibility date agreed upon during carrier enrollment to prevent a gap in coverage from the carrier's effectuation process