Acknowledgement Procedures 270/271 Transaction Notes (Washington State Health Care Authority) Acknowledgement Procedures 270/271 transaction subject general HIPAA standard requirements as well as Health Care Authority 270/271 transaction guidelines. HIPAA EDI allows covered entities to submit and retrieve the HIPAA mandated transactions from Washington State Medicaid. Covered entities (clearinghouses, providers, health plans) are required to successfully complete EDI testing for Read More →