A Participating Physician (PAR) is a healthcare provider who has entered into an agreement with an insurance company to accept the insurer’s approved amount as full payment for covered services. This essentially means PAR physicians agree to the reimbursement rates set by the insurer and typically handle claims submission directly.

Pass-through is a temporary payment policy that lets providers get reimbursed separately for certain drugs, biologics, or medical devices on top of the usual bundled payment. It’s meant to bridge the gap while new or high-cost technologies are being adopted, so providers aren’t penalized financially before those items are built into standard payment rates.

Patient registration is the process of enrolling a patient's name and identity into the hospital records to keep track of services provided to each patient.

“Per Member Per Month”, or PMPM for short, is a common way of measuring costs, spending, and sometimes even profits in the healthcare industry. It refers to the average cost (or revenue) for a single member each month.

The principal diagnosis is the main condition, determined after clinical evaluation, that led to the patient's hospital admission, as defined by UHDDS guidelines.