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.

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.