the HIPAA EDI transaction codes are X12 837 (claim/encounter transactions), X12 270 and 271 (eligibility inquiries and responses), X12 276 and 277 (claim status inquiries and responses), X12 278 (referrals and prior authorization transactions), X12 835 (health care payment and remittance information), and X12 275 (health claims attachments).
Huh. Which of those do I use to order a CBC? Which one sends a history and physical to the hospital? Which one does the MRI machine use to send me the picture of your brain? (trick question!)
Everyone's been using these transactions for years, but they are not relevant to the issue being discussed here.