out-of-pocket cap

An annual limit on how much an individual has to pay in deductibles, coinsurance and copayments, excluding the premium. The Affordable Care Act (ACA) requires new plans offered beginning in 2014 to include an out-of-pocket maximum set at the current maximum level for...

outcomes research

Research that attempts to evaluate particular health services by tracking and analyzing clinical results (e.g., death, illness, ability to function) of various treatments. (See also Patient-Centered Outcomes Research Institute.)


A person receiving medical services who has not been admitted to a hospital.

outpatient hospital services

Services provided to a hospital outpatient. They are covered by Part B for Medicare beneficiaries. (See Medicare chapter.)