A case mix group is used in patient

Patient

A patient is any recipient of healthcare services. The patient is most often ill or injured and in need of treatment by a physician, advanced practice registered nurse, veterinarian, or other health care provider....

 classification system to group together patients with similar characteristics. This provides a basis for describing the types of patients a hospital

Hospital

A hospital is a health care institution providing patient treatment by specialized staff and equipment. Hospitals often, but not always, provide for inpatient care or longer-term patient stays....

 or other health care provider

Health care provider

A health care provider is an individual or an institution that provides preventive, curative, promotional or rehabilitative health care services in a systematic way to individuals, families or communities....

 treats (its case mix). Case mix groups are used as the basis for the Health Insurance Prospective Payment System (HIPPS) rate codes used by Medicare

Medicare (United States)

Medicare is a social insurance program administered by the United States government, providing health insurance coverage to people who are aged 65 and over; to those who are under 65 and are permanently physically disabled or who have a congenital physical disability; or to those who meet other...

in its prospective payment systems.

Case mix groups are designed to aggregate acute care inpatients that are similar clinically and in terms of resource use. Acute care inpatients are assigned to groups based on clinical and administrative data collected via the Discharge Abstract Database (DAD).