POS : Point of Service Plan - A managed care plan that allows subscribers to choose either "in plan" (or "preferred providers") or "out of plan" services at the time of care, rather than committing to use only "in plan" services as in an HMO.  "Out of plan" services come at the cost of a higher co-pay, but they are covered. 

PPO : Preferred Provider Organization - A plan that offers better coverage when providers who have agreed to a plan's (usually discounted) fee schedule are used.

pre·ter·nat·u·ral (prtr-nchr-l, -nchrl)
adj.

1. Out of or being beyond the normal course of nature; differing from the natural.
2. Surpassing the normal or usual; extraordinary: “Below his preternatural affability there is some acid and steel” (George F. Will).
3. Transcending the natural or material order; supernatural.

praeterntrlis,

praeter ntrm,

ntra,

privileges - in reference to a hospital, the right to admit patients, see patients in consultation, or perform certain procedures; privileges to do procedures, such as surgery or cardiac catheterization, are determined by evidence of adequate residency "training", demonstrated ability, or past experience; a physician who has been granted privileges may also be referred to as "on staff"; however, "non-staff" physicians and even other practitioners such as podiatrists and chiropractors may order outpatient tests such as x-rays and lab work.

credentialing - the process of performing a background check and approving a physician's application to be added to a panel of practitioners who will be reimbursed by an insurance plan.   

non-specific - general, or not peculiar to a particular condition.  This is usually used in regard to symptoms or laboratory tests, and means that an abnormal finding if not suggestive of any one disease, such as a "non-specific" rash.  Cf. "pathognomonic" 

pathognomonic - characteristic to the point of exclusivity, without the need for further findings or testing to confirm.  E.g., the rash of chicken pox is pathognomonic of the disease.

essentially  - a qualifier used to mean "for the most part", it implies minimal importance rather than insignificant difference in abnormalities.  A term overused in medicine, especially in medical school.  "Lab work was essentially normal" would translate as: "while not technically within the normal ranges given out by the lab, the abnormalities are of no importance; I didn't miss them, so don't try to make yourself look smart at my expense."  It is considered a time-saver and the first line of defense against the annoyingly compulsive.