Traditional MedicareAdministrativeHigh impact
Timely Filing of Medicare/Medicaid Crossover Claims
Illinois Medicaid - HFS·IL·Provider Notice
Effective date
May 1, 2008
We identified it
Jun 21, 2026
Summary
Illinois Medicaid has established a new 24-month timely filing requirement for Medicare/Medicaid crossover claims, measured from the date services were provided. Claims not meeting this timeframe will be rejected with error code D45 starting May 1, 2008.
Action Required
By May 1, 2008: Billing team must ensure all Medicare/Medicaid crossover claims are submitted within 24 months of service date. Update billing system to flag claims approaching the deadline. For denied Medicare claims requiring special handling, use the specified P.O. Box addresses in Springfield. Monitor for new error code D45 rejections and adjust submission timing accordingly.