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71 Chapter 1: Introduction to the Oregon Programs Eligibility Notebook • Section 4: Glossary and acronyms (07/2026) Mass update ONE system functionality in which eligibility can be automatically re-evaluated for multiple cases without eligibility worker action. Mass updates occur nightly, weekly, monthly, annually, or as needed such as with a Cost of Living (COLA) increase. MCI Master Client Index A central database that stores identifying information including the client’s name, date of birth, gender, and Social Security Number (if available). Before assigning a new Individual ID to a client, the client’s information gathered during Application Registration is compared against the Master Client Index (MCI) during File Clearance so that a duplicate record is not created for the client. MEC Minimum essential coverage Medical coverage under: (a) A government-sponsored plan, including Medicare Part A, Medicaid (excluding CWM), CHIP, TRICARE, the veterans’ health care program, and the Peace Corps program; (b) Employer-sponsored plans with respect to an employee, including coverage offered by an employer that is a government plan, any other plan or coverage offered in the small or large group market within the state, and any plan established by an Indian tribal government; (c) Plans in the individual market; (d) Health insurance plans in place on or before March 23, 2010; or (e) Any other health benefits coverage, such as a state health benefits risk pool, as recognized by the HHS secretary in coordination with the Treasury Secretary. Medicaid Oregon’s Medicaid program under Title XIX of the Social Security Act. Medicare Medicare is the Federal Entitlement Health Insurance Program for people who meet at least one of the following criteria: • 65 years or older • Disabled or Blind receiving SSDI for 24 months • Diagnosed with ESRD (End Stage Renal Disease) or ALS (Lou Gehrig’s disease) Medicare has 4 parts: • Part A – Hospital Insurance • Part B – Medical Insurance • Part C – Medicare Advantage (similar to an HMO or PPO) • Part D – Prescription Plan