| Acronym | Term | Category |
| O&M |
Operations & Maintenance |
General |
| O&M |
Organization & Management |
General |
| O/H |
Overhead |
General |
| OA |
Office Automation |
General |
| OA |
Office of the Administrator, CMS |
General |
| OAA |
Old Age Assistance |
General, Health Care |
| OAA |
Older Americans Act |
General, Health Care |
| OAC |
OASIS Automation Coordinator |
General, Medicare Beneficiary |
| OACT |
Office of the Actuary |
General, Medicare Beneficiary |
| OASB |
Old Age & Survivors Benefits |
General, Health Care |
| OASDHI |
Old Age, Survivors, Disability & Health Insurance |
General, Health Care |
| OASDI |
Old Age, Survivors & Disability Insurance |
General, Health Care |
| OASH |
Office of the Assistant Secretary for Health |
General, Health Care |
| OASI |
Old Age & Survivors Insurance |
General, Health Care |
| OASIS |
Outcome & Assessment Information Set |
General |
| OATS |
Operation Assignments Tracking System |
General |
| OBQI |
Outcome Based Quality Improvement |
General |
| OBQIM |
Outcome Based Quality Improvement Management |
General |
| OBQM |
Outcome Based Quality Monitoring |
General, Medicare Beneficiary |
| OBRA |
Omnibus Budget Reconciliation Act |
General, Medicare Beneficiary |
| OBRA |
Omnibus Budget Reconciliation Act of 1981/1987/1989/1990 |
General |
| OCD |
OIG Clearance Document |
General |
| OCD |
Operational Capability Demonstration |
General, Health Care |
| OCE |
Outpatient Code Editor (System) |
General |
| OCESAA |
Omnibus Consolidated & Emergency Supplemental Appropriations Act for FY 1999 |
General |
| OCFAA |
Office of Civil Fraud & Administrative Adjudication |
General, Health Care |
| OCHAMPUS |
Office of Civilian Health & Medical Program of the Uniformed Services |
General |
| OCI |
Organizational Conflict of Interest |
General |
| OCR |
Office of Civil Rights |
General, Health Care |
| OCR |
Optical Character Recognition |
General, Health Care |
| OCR |
Office for Civil Rights |
General, Medicare Beneficiary |
| OCSE |
Office of Child Support Enforcement |
General |
| OCST |
Outstation Customer Service Team (also CSOT) |
General |
| ODA |
Occupancy Depreciation & Amortization |
General |
| ODIE |
Online Data Input & Edit (Subsystem) (OSCAR frontend system) |
General |
| ODL |
Outpatient Diagnostic Laboratory |
General, Health Care |
| ODSN |
Organization Development Services Network |
General |
| OEC |
OASIS Educational Coordinator |
General, Medicare Beneficiary |
| OEM |
Original Equipment Manufacturer |
General |
| OEO |
Occupant Emergency Organization |
General |
| OEP |
Open Enrollment Period |
IT Organization |
| OEPI |
Open enrollment period for institutionalized individuals |
General, Medicare Beneficiary |
| OEPNEW |
Open Enrollment Period for Newly Eligible Individuals |
IT Organization |
| OES |
Occupational Employment Survey |
General |
| OF |
Optional Form |
General |
| OFA |
(FSA) Office of Family Assistance |
General |
| OFB |
Outpatient Feedback |
General, Health Care |
| OFCCP |
Office of Federal Contract Compliance Programs |
General |
| OFPP |
Office of Federal Procurement Policy |
General |
| OGC |
(HHS) Office of the General Council |
Medicare Beneficiary, Health Care |
| OGE |
Office of Government Ethics |
General |
| OHCDS |
Organized Health Care Delivery System |
General, Health Care |
| OHDS |
Office of Human Development Services |
General, Health Care |
| OHTA |
(PHS) Office of Health Technology Assessment |
General, Health Care |
| OI |
Office of Inspections |
General |
| OI |
Office of Investigations, OIG |
General |
| OIA |
Office of Intergovernmental Affairs |
General |
| OIC |
Opportunity to Improve Care |
General, Health Care |
| OICS |
Office of Internal Customer Support, CMS |
General |
| OIFO |
Office of Investigations Field Office |
General |
| OIG |
Office of the Inspector General |
Medicare Beneficiary, Health Care |
| OIRA |
Office of Information & Regulatory Affairs |
General |
| OIS |
Office of Information Services, CMS |
General |
| OIS |
Office of Information Systems |
General, Medicare Beneficiary |
| OJT |
OnTheJob Training |
General |
| OL |
Office of Legislation, CMS |
General |
| OLAP |
OnLine Analytic Processing |
General, IT Organization |
| OLM |
Online Mapping |
General, IT Organization |
| OLMR |
Office of Labor Management Relations |
General |
| OLQ |
Online Query |
General |
| OLTC |
Other Long Term Care |
General, Health Care |
| OLTP |
OnLine Transaction Processing |
General |
| OMB |
(HHS) Office of Management & Budget |
General |
| OMB |
Office of Management and the Budget |
General, Medicare Beneficiary |
| OMCH |
Office of Maternal & Child Health |
General, Health Care |
| OMESP |
Omnibus Medicare Enrollment System Processor |
General, Health Care |
| OMM |
Office of Medicaid Management, MB |
General, Health Care |
| OMP |
Operational Management Plan |
General |
| OMR |
Office of Medical Review |
General |
| OMR |
Optical Mark Reading |
General, Health Care |
| OMRA |
Other Medicare Required Assessment |
General, Health Care |
| OMS |
Oversight and Management System |
IT Organization |
| OOP |
Object Oriented Programming |
General, IT Organization |
| OOSA |
Out of Service Area (use OSA) |
General, Health Care |
| OP |
Organization Purpose |
General |
| OP |
Outpatient |
Medicare Beneficiary, Health Care |
| OP |
Overpayment |
Medicare Beneficiary, Health Care |
| OPA |
Organ Procurement Agency |
General, Health Care |
| OPAC |
Online Payment & Accounting Collection (System) (Treasury) |
General |
| OPD |
OutPatient Department |
General, Health Care |
| OPDIV |
OPerating DIVision |
General |
| OPI |
Office of Primary Interest |
General |
| OPI |
Other Processing Information |
General |
| OPIC |
Overseas Private Investment Corporation |
General |
| OPL |
Operation Policy Letter |
General |
| OPM |
Office of Personnel Management (formerly CSC) |
Medicare Beneficiary, Health Care |
| OPM |
Office of Personnel Management |
General, Medicare Beneficiary |
| OPO |
Organ Procurement Organization |
General, Health Care |
| OPPS |
Outpatient Prospective Payment System |
Medicare Beneficiary, Health Care |
| OPR |
Office of Public Relations, CMS |
General |
| OPS |
Output Performance Standards |
General |
| OPSA |
Office of Professional & Scientific Affairs |
General |
| OPTN |
Organ Procurement & Transplantation Network |
General, Health Care |
| OQ |
Office of Qualification |
General |
| OQC |
Operations Quality Council |
General |
| ORA |
(see OBRA) |
General |
| ORBTUP |
Orbit Update (MBR) |
General |
| ORDI |
Office of Research, Development, and Information, CMS |
General |
| ORF |
Outpatient Rehabilitation Facility |
General, Health Care |
| ORHP |
(HRSA) Office of Rural Health Policy |
General, Health Care |
| ORR |
Office of Refugee Resettlement |
General |
| ORSI |
Office of Retirement & Survivors Insurance |
General, Health Care |
| ORT |
Operation Restore Trust |
General |
| ORTIS |
Operation Restore Trust Information System |
General |
| ORUS |
Operations Resources Utilization System |
General |
| OS |
Office of the Secretary |
General |
| OS |
Organization Structure |
General |
| OS/ES |
Office of the Secretary / Executive Secretariat |
General |
| OSA |
Out of Service Area (also OOSA) |
General |
| OSC |
Office of Standards & Certification |
General |
| OSC |
Office Systems Coordinator |
General |
| OSCAR |
Office of Standards & Certification Automated Retrieval System |
General |
| OSCAR |
Online Survey Certification & Reporting (System) |
General |
| OSDIT |
Office of Software Development & Information Technology |
General, IT Organization |
| OSE |
Office Systems Equipment |
General |
| OSE |
Open Software Evaluation |
General, IT Organization |
| OSE |
Open Systems Environment |
General |
| OSERS |
Office of Special Education Rehabilitation Services |
General |
| OSH ACT |
Occupational Safety & Health Act |
General, Health Care |
| OSHA |
Occupational Safety & Health Administration |
General, Health Care |
| OSI |
Open System Interconnection |
General |
| OSI/SAS |
Optimum System Incorporated/Shared Arkansas System |
General |
| OSP |
Outpatient Speech Pathology |
General, Health Care |
| OSPATS |
OnSite Surveyor Performance Assessment & Training Survey |
General |
| OSTP |
Office of Science & Technology Policy |
General |
| OTA |
(Congressional) Office of Technology Assessment |
General |
| OTA |
Office of Technical Assistance |
General |
| OTC |
OneTimeCost |
General |
| OTC |
Over the Counter |
General |
| OTIS |
Office of Telecommunications & Information Systems |
General, IT Organization |
| OTIS |
Online Telecommunications Information System |
General, IT Organization |
| OTP |
OneTime Payment |
General |
| OTR |
Off theRecord |
General |
| OTR |
On theRecord |
General |
| OTS |
OneTime Source |
General |
| OWCP |
Office of Worker's Compensation Programs |
General |
| OWL |
Older Women's League |
General, Health Care |
| OWTDS |
Office of Washington Training & Development Services |
General |