Across all provider and payer types, the mean reimbursement per ambulance transport is $1,147.

From: https://www.ems1.com/ems-trend-report/quantifying-the-gap-between-expenses-and-revenue-for-ems-services

So $1500 doesn't seem unusal.

The Centers for Medicare & Medicaid Services report they reference has a lot of information about how much ambulance service in the US costs to provide and how much they end up getting reimbursed: https://www.cms.gov/files/document/medicare-ground-ambulance-data-collection-system-gadcs-report-year-1-and-year-2-cohort-analysis.pdf