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27 Chapter 1: Introduction to the Oregon Programs Eligibility Notebook • Table of contents (07/2026) Because OPEN is updated quarterly, past downloaded versions will not be correct and may result in policy errors. Additional resources and links The following links may be helpful resources for staff determining eligibility. • ODHS Administrative Rule Search • DELC ERDC Administrative Rule Search • MAGI Medical programs Administrative Rules • Transmittal database • ODHS/OHA Publications and Forms • Local offices • ODHS Business Procedure Manual (for internal use only) • Historical Versions of FSM/OPEN