CO-76: Disproportionate Share Adjustment

What Does CO-76 Mean?

CO-76 is the standard DSH contractual adjustment under Medicare PPS. It represents the gap between billed charges and the DRG-plus-DSH payment. This is a normal payment component for qualifying hospitals, not a denial. The provider absorbs this adjustment as a contractual allowance and cannot bill the patient.

CARC 76 appears on remittances for hospitals that qualify for Disproportionate Share Hospital payments under Medicare's Inpatient Prospective Payment System. The DSH add-on recognizes that hospitals treating a higher proportion of low-income and Medicaid-eligible patients incur greater uncompensated care costs and should receive additional reimbursement.

The DSH payment is calculated based on the hospital's disproportionate patient percentage (DPP), which combines two components: the Medicaid patient utilization rate (Medicaid days as a fraction of total days) and the SSI recipient ratio (Medicare patients receiving Supplemental Security Income as a fraction of total Medicare discharges). Hospitals must meet a minimum DPP threshold to qualify for DSH payments, and the add-on amount scales with the DPP.

CARC 76 on the ERA represents the contractual difference between billed charges and the DRG-plus-DSH payment. Like CARC 74 (IME) and CARC 75 (DGME), this is a standard Medicare payment component rather than a true denial. It is almost always paired with CO, making it a contractual write-off. If the DSH adjustment amount seems wrong, the issue typically traces to incorrect Medicaid utilization data, outdated SSI ratios, or a hospital that fell below the DPP eligibility threshold. Revenue cycle teams at DSH-eligible hospitals should reconcile CARC 76 alongside CARC 74 and 75 for comprehensive Medicare payment monitoring.

Common Causes

How to Resolve

Validate the DSH eligibility status and adjustment calculation, then post the contractual write-off or submit corrected data to the MAC.

1. Reconcile the DSH payment Calculate the expected DSH add-on using the hospital's DPP and the CMS DSH formula for the applicable fiscal year. Compare to the CO-76 amount on the ERA.
2. Verify Medicaid and SSI data Confirm the Medicaid utilization rate and SSI ratio used by the MAC are current and reflect actual patient demographics. Outdated data can significantly alter the DSH payment.
3. Post the contractual adjustment If the calculation is correct, post CO-76 as a contractual write-off. Track it alongside CARC 74 and 75 for complete Medicare payment reconciliation.
4. Submit corrected data if needed If the DPP or its component data is wrong, compile corrected Medicaid day and SSI records and submit them to the MAC with a reprocessing request.

Common RARC Pairings

The RARC code tells you exactly what triggered the CO-76:

How to Prevent CO-76

• Maintain accurate Medicaid patient day counts and SSI recipient data to support the DPP calculation
• Track DSH eligibility metrics throughout the year to anticipate whether the hospital will meet the threshold
• Submit all required DSH documentation well in advance of cost report deadlines
• Conduct regular audits of the data inputs used in the DSH formula to prevent reporting errors
• Monitor annual CMS updates to the DSH payment formula and uncompensated care pool allocation methodology

General Prevention

• Maintain accurate patient demographic and financial data to support the hospital's disproportionate patient percentage calculation
• Track Medicaid patient days and SSI recipient days throughout the year to monitor DSH eligibility status proactively
• Submit all required DSH documentation to CMS and the MAC well in advance of cost report deadlines
• Conduct regular internal audits of the data inputs used in the DSH calculation to prevent reporting errors
• Monitor annual CMS updates to DSH payment formulas and thresholds and incorporate changes into revenue cycle projections

Also Filed As

The same CARC 76 may appear with different Group Codes:

Related Denial Codes