LINCOLN, Neb. (AP) — State auditors have found more than $13 million in uncashed checks piling up at the Nebraska Department of Health and Human Services.

The 192 checks were all related to the Medicaid drug rebate program.

The state Auditor’s office called the uncashed checks a significant management problem.

Officials at the agency say the backlog of checks developed because they needed to be researched and checked before depositing, but staffing issues made that hard to do.

One HHS accountant retired in April and a second one took medical leave in June. Officials say that left the department without an accountant familiar with the drug rebate program.