MedicaidBilling CodesMedium impact
BT202043: IHCP COVID-19 Response: Diagnosis code Z03.818 added to Emergency Department Autopay List
Indiana Medicaid (IHCP)·IN · Emergency Medicine·Provider Bulletin
Effective date
Apr 1, 2020
We identified it
Jun 19, 2026
Summary
The Indiana Health Coverage Programs (IHCP) has added diagnosis code Z03.818 (Encounter for observation for suspected exposure to other biological agents ruled out) to the Emergency Department Autopay List for managed care plans and designated it as an emergency diagnosis code for fee-for-service claims. This change supports COVID-19 response efforts and affects automatic payment processing for ED visits with this diagnosis.
Action Required
Immediately: Billing team should verify that diagnosis code Z03.818 is configured in billing systems to process as an emergency diagnosis for Indiana Medicaid claims. Update encounter forms and EMR templates to include this code for suspected COVID-19 exposure cases that are ruled out. Review the Emergency Department Autopay List at in.gov/medicaid/providers for complete code requirements.