Adonis vs Waystar

Adonis agents research denials and prepare appeals, per the vendor, and Waystar lists denial recovery inside a wider platform that also covers eligibility, estimates, authorizations, remittance and patient payments. For a specialty group on athenahealth, ModMed or NextGen with a denials backlog, Adonis names those EHRs on its partner list while Waystar's homepage names none, which makes Waystar the weaker fit. Adonis customers named by MedCity include Mount Sinai, Baptist Health South Florida, AdventHealth and ApolloMD. The vendor reports a 67% denial reduction at ApolloMD, with no baseline or period. Waystar suits a health system billing office that wants front-end clearance and patient payments on the same platform as its denial recovery. It has traded on Nasdaq (WAY) since June 2024 and says it covers 1M+ providers. Adonis, with $40M raised in a March 2026 Series C, is the vendor to weigh when the problem is claims already stalled with a payer.