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- OBRA
- Omnibus Budget Reconciliation Act of 1986
- OCL
- Outstanding Claims Liability
- OOA/ITS
- Out-of-Area Program/Inter-Plan Teleprocessing Services
- OOP
- Out-of-Pocket
- OP
- Outpatient
- OPAP
- Outpatient Pre-Treatment Authorization Plan
- OPL
- Other Party Liability