1. Average relative weight of all cases treated at a facility or by a certain physician that reveals the clinical severity of a defined group in relation to other groups in the classification system. Formula: Divide the sum of the weights of diagnosis-related groups (DRGs) for patient discharged during a specified period by the total number of patients discharged. A low CMI may indicate DRG assignments that do not adequately reflect the resources used to treat Medicare patients. 2. In prospective payment systems, this is the comparison of a hospital’s cost for its case mix to the national or regional average hospital cost for a similar case mix.

Mathematical method used to determine the case mix index by taking the sum of all diagnosis-related groups’ (DRGs’) relative weights and dividing it by the number of Medicare cases.

1. Numeric assigned by the insurance carrier (payer) to an insurance claim. When appealing a denied or rejected claim, it must appear on each page of the document that is submitted to the payer. 2. See group number.

1. In managed health care, an averaging after a flat rate is given to certain categories of procedures. 2. Package price for a specific procedure or diagnostic-related group (DRG). Also called bundled rate or flat fee-per-case .

Form sent by an insurance company’s home office to a branch office that condenses important information about a new case or a change in an existing case. Also known as an abstract.

Database of billed insurance claims from which CMRI selects the specific review category samples.

In managed health care, payment to specialists such as orthopedists, urologists, and oncologists based on either referral or episode of care of the patient. Also called contract capitation.

Costs of the service when payment was made rather than when the service was performed.

Cash paid, draft redeemed or drawn, for settlement of a group insurance claim.