Healthcare Glossary

Key healthcare terms

O

Occlusal
Biting or grinding surfaces of molars and bicuspids.
Occlusal guard (night guard)
Removable appliance, usually constructed of plastic, that covers one or both dental arches; designed to minimize the damaging effects of teeth grinding.
Occlusion
Contact between the biting or chewing surfaces of upper and lower teeth is called occlusion.
Occupational therapy
After an illness or injury, you many lose the ability to perform everyday activities such as bathing, preparing meals, or housekeeping. Occupational therapy helps you resume these life activities. It can be offered as inpatient or outpatient services.
Occusource
This refers to Concentra medical centers’ proprietary software for collection, maintenance, and analysis of patient information.
Office visit
A term that refers to services performed in a provider's office.
Onlay
Restoration that is extended to cover the entire incisal or occlusal surface of the tooth, an onlay is often used to restore lost tooth structure and increase the height of the tooth.
Open access
See Open Panel.
Oral surgeon
This type of dental is a specialist whose practice is limited to diagnosing and performing surgery or associated treatments for diseases, injuries, deformities, and defects of the oral region.
Oral surgery
This dental specialty is concerned with the surgical procedures in and about the mouth and jaw.
Original amount
For a spending account, this is the amount you requested for reimbursement from the account.
Orthodontic services
These services refer to a dental specialty concerned with the correction of improper alignment of the upper and lower teeth.
Orthodontist
A dental specialist, an orthodontist’s practice is limited to treating misaligned teeth and their surrounding structures.
OSHA
The Occupational Health and Safety Administration is a federal agency under the Department of Labor that publishes and enforces safety and health regulations for most businesses and industries in the United States.
Osseous
Pertaining to bone.
Other insurance paid amount
The amount paid by your other primary insurance.
Out-of-area
Out-of-area refers to services members of a Medicare Advantage receive from providers that have no contractual or other relationship with the plan.
Out-of-network
This refers to doctors, hospitals, pharmacies, and other healthcare professionals or suppliers who do not belong to a health or drug plan's provider/pharmacy network. See the definition of network.
Out-of-network benefit
Generally, an out-of-network benefit gives you the option to use a doctor, specialist, or hospital that is not a part of the plan's contracted network. In some cases, your out-of-pocket costs may be higher for an out-of-network benefit.
Out-of-network doctor
A primary care physician or specialist who does not belong to a health plan's provider network is considered an out-of-network doctor. In some cases, your out-of-pocket costs may be higher if you choose to use an out-of-network doctor. See the definition of network.
Out-of-network pharmacy
This is a pharmacy that is not under contract with Humana. By choosing an out-of-network pharmacy, you may pay more through coinsurance. These providers may also bill you for costs that are not covered by your insurance plan. In addition, you will need to meet an out-of-network deductible (separate from your in-network deductible) before Humana begins to pay for covered services.
Out-of-network provider
Also called non-participating provider, this term refers to providers who are not part of the Humana network and, therefore, will cost you more.
Out-of-pocket costs
These are healthcare costs that you pay on your own because they are not covered by your Medicare plan or other insurance.
Out-of-pocket maximum
This is the annual limit on your costs. After you meet the maximum out-of-pocket amount, your plan pays 100% for covered services. You may still pay copayments. Refer to the plan's Benefits Summary for more details.
Outpatient Prospective Payment System (OPPS)
TRICARE OPPS is used to pay claims for hospital outpatient services. TRICARE OPPS is based on nationally established Ambulatory Payment Classification payment amounts and standardized for geographic wage differences that include operating and capital-related costs, which are directly related and integral to performing a procedure or furnishing a service in a hospital outpatient department. TRICARE OPPS became effective May 1, 2009.
Outpatient services
This refers to a service you receive within one day — 24 hours — at a hospital outpatient department or community mental health center.
Overbite
Misalignment of the upper and lower teeth or jaws in which the upper teeth overlap the lower teeth when the mouth is closed.
Overdenture
This is a complete denture that fits over one or more natural teeth