OA-A6: Prior Hospitalization or 30-Day Transfer Requirement Not Met

What Does OA-A6 Mean?

OA-A6 appears when the prior hospitalization requirement issue involves coordination between facilities or payers where the responsibility is not clearly the admitting provider's contractual obligation. This may occur when the prior hospitalization occurred at a facility that did not properly communicate the patient's status.

When CARC A6 appears on a remittance, the payer is denying the claim because the patient did not meet the required prior hospitalization or 30-day transfer criterion. This code is most commonly associated with Medicare skilled nursing facility (SNF) coverage, which requires the patient to have had a qualifying inpatient hospital stay of at least 3 consecutive days within 30 days before the SNF admission.

The 3-day rule is a frequent source of A6 denials. Under traditional Medicare, observation stays do not count toward the 3-day requirement — only formally admitted inpatient days qualify. A patient who spent 4 days in the hospital under observation status and then transferred to a SNF would trigger CARC A6 because those observation days do not satisfy the inpatient stay requirement. The distinction between observation and inpatient status is critical and often the root cause of this denial.

Beyond the 3-day stay, the 30-day transfer window is the second common trigger. Even if the patient had a qualifying inpatient stay, the SNF admission must occur within 30 days of the hospital discharge date. Delays in transfer — whether due to bed availability, patient recovery, or administrative issues — can push the admission past the 30-day window and result in a CARC A6 denial.

How to Resolve

Verify whether the patient had a qualifying inpatient stay within 30 days of admission, then appeal with documentation or determine patient liability.

1. Coordinate with the prior hospital Contact the originating hospital to obtain complete records of the prior stay, including inpatient versus observation status determination.
2. Resolve the status and appeal Work with the originating hospital to correct any status issues and submit an appeal to the payer with documentation from both facilities.

Common RARC Pairings

The RARC code tells you exactly what triggered the OA-A6:

How to Prevent OA-A6

• Establish communication protocols with referring hospitals to verify inpatient status before accepting transfers for SNF care

Also Filed As

The same CARC A6 may appear with different Group Codes:

Related Denial Codes