CO-74: Indirect Medical Education Adjustment

What Does CO-74 Mean?

CO-74 is the standard IME adjustment under Medicare's inpatient PPS. It represents the contractual difference between the hospital's billed charges and the DRG-plus-IME payment amount. This is not a denial — it is the normal payment methodology for teaching hospitals. The provider absorbs this adjustment as a contractual allowance.

CARC 74 shows up on remittances for teaching hospitals as part of Medicare's Inpatient Prospective Payment System calculation. The Indirect Medical Education adjustment recognizes that teaching hospitals incur higher costs per case due to the involvement of residents in patient care, additional diagnostic testing, and the overall complexity of cases attracted by academic medical centers.

The IME payment is calculated as a percentage add-on to the DRG payment, driven primarily by the hospital's intern-and-resident-to-bed (IRB) ratio. A higher IRB ratio generates a larger IME add-on. CARC 74 on the ERA represents the contractual adjustment between the hospital's billed charges and the DRG-plus-IME payment amount. Because hospitals bill charges that typically exceed PPS payments, this adjustment will always appear on teaching hospital remittances.

Since CARC 74 is a structural component of the Medicare payment formula, it is not a denial in the traditional sense. It is almost always paired with Group Code CO, designating it as a contractual write-off. However, if the IME adjustment amount seems incorrect, the root cause usually lies in an inaccurate IRB ratio, a miscoded DRG, or outdated resident count data. Teaching hospitals should reconcile expected versus actual IME payments on every remittance to catch calculation errors early.

Common Causes

How to Resolve

Reconcile the IME adjustment against expected payment calculations, verify the input data, and post the contractual write-off or request correction.

1. Reconcile IME payment against expected amount Use your hospital's IRB ratio, the DRG relative weight, and the current CMS IME multiplier to calculate the expected IME payment. Compare this to the CO-74 adjustment amount.
2. Verify DRG accuracy Confirm the DRG is correctly coded. An undercoded case with a lower DRG weight reduces the IME payment proportionally.
3. Post the contractual adjustment If the IME calculation matches expectations, post the CO-74 amount as a contractual write-off in your revenue cycle system.
4. Request correction if inputs are wrong If the IRB ratio, bed count, or resident FTE data used by the MAC is outdated or incorrect, submit corrected data and request reprocessing.

Common RARC Pairings

The RARC code tells you exactly what triggered the CO-74:

How to Prevent CO-74

• Keep intern-and-resident-to-bed ratio data current and submit updates to CMS whenever residency program counts change
• Ensure all residency program accreditation and approval documentation is filed and up to date
• Conduct DRG coding audits to ensure accurate DRG assignment, since DRG weight directly drives the IME payment
• Train revenue cycle staff on the IME payment formula so they can identify and flag unexpected adjustment amounts
• Monitor annual CMS updates to the IME adjustment multiplier and incorporate changes into payment projections

General Prevention

• Maintain accurate and current intern-and-resident-to-bed ratio data and submit updates to CMS promptly when residency program counts change
• Ensure teaching hospital accreditation and residency program documentation is complete and readily available for payer audits
• Conduct regular coding audits focused on DRG assignment accuracy, since DRG weight directly impacts IME payment calculations
• Train billing staff on IME payment methodology so they can identify and reconcile expected versus actual adjustment amounts
• Monitor annual CMS updates to the IME adjustment formula and incorporate changes into revenue cycle projections

Also Filed As

The same CARC 74 may appear with different Group Codes:

Related Denial Codes