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Navigating the Miles How to Bill for Ground Ambulance Mileage
Act
immediately
Effective date
Jun 8, 2026
Identified
Jun 20, 2026
Summary
New policy clarifies ground ambulance mileage billing procedures, specifying that A0425 should be billed for one-way mileage from pickup to destination. The EP modifier must be applied to A0425 when billing Healthy Children and Youth (HCY) transports, but no modifiers should be used for other trip types.
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What to do
immediately · 4 steps
01Billing team must update ambulance billing procedures to ensure A0425 (ground mileage) is billed one-way only from pickup to destination.
02Apply EP modifier to A0425 only when base procedure codes include EP modifier for HCY transports.
03Remove any other modifiers from A0425 for non-HCY trips.
04Update billing software rules and staff training accordingly.
Codes mentioned
A0425A0426A0427A0428A0429A0433
Original notice
Navigating the Miles How to Bill for Ground Ambulance Mileage
mydss.mo.gov · Always check the source before changing claims.
Related changes
See all Missouri Medicaid (MO HealthNet) changes →CMS Approves Ground Ambulance Transport to Behavioral Health Crisis Centers (BHCCs) State Plan Amendment (SPA)MediumEffective Jan 1, 2026 · Provider BulletinAmbulance Billing for Procedure Code A0428MediumEffective Mar 29, 2024 · Provider NoticeBrowse every Missouri Medicaid (MO HealthNet) change in the policy list