Midstream Health, whose AI tools help 250 hospitals recover revenue from rebates and vendor and payer underpayments, raised a $20M Series A led by Valtrius (Will Maddox/Axios)

Will Maddox / Axios: Midstream Health, whose AI tools help 250 hospitals recover revenue from rebates and vendor and payer underpayments, raised a $20M Series A led by Valtrius — Midstream Health, an AI financial system for hospitals, raised a $20 million Series A round to expand its platform …