Using patient age in defining DRGs for Medicare payment

Area of Science:

• Health economics
• Healthcare policy
• Medical billing

Background:

• Medicare's prospective payment system (PPS) utilizes Diagnosis Related Groups (DRGs) for reimbursement.
• Patient age and the presence of complications/comorbidities (CC) were previously key factors in DRG assignment.
• Significant revisions to DRG criteria were enacted in October 1987.

Purpose of the Study:

• To evaluate the appropriateness of using patient age in conjunction with CC for DRG classification.
• To analyze the financial impact of the previous DRG system on Medicare payments.

Main Methods:

• Analysis of inpatient billing data from 1984.
• Statistical examination of the relationship between patient age, CC, and healthcare charges.

Main Results:

• The combination of patient age and CC was found to be an inappropriate method for grouping Medicare patients.
• The prior DRG system led to underpayment for patients with CC.
• The prior DRG system resulted in overpayment for patients aged 70 and older without CC.

Conclusions:

• The study's findings supported the removal of age as a combined factor with CC in DRG determination.
• Revising DRG criteria is essential for accurate Medicare reimbursement and equitable patient classification.