This X12 Transaction Set contains the format and establishes the data contents of the Eligibility, Coverage or Benefit Inquiry Transaction Set (270) for use within the context of an Electronic Data Interchange (EDI) environment. This transaction set can be used to inquire about the eligibility, coverages or benefits associated with a benefit plan, employer, plan sponsor, subscriber or a dependent under the subscriber's policy. The transaction set is intended to be used by all lines of insurance such as Health, Life, and Property and Casualty.