Investing in Prosper AI

a16z leads Prosper AI's Series A

America | Tech | Opinion | Culture | Charts

Healthcare runs on the office landline.

Behind every doctor is a room you never see: staff in headsets, scheduling patient visits while sitting on hold with insurance companies, typing into the electronic health record (EHR) one field at a time. None of it is medicine, and all of it decides whether you get seen and whether your doctor gets paid. Confirming your insurance coverage before a visit can mean a 40-minute phone call. Get one field wrong and the appointment doesn’t clear, the claim goes unpaid, and you land in collections months later – for care you assumed was covered. Decades of patient portals later, the work still happens over the phone.

That’s the layer Prosper rebuilds.

Prosper is an AI-native platform that runs the voice-heavy work for clinic operations end-to-end: appointment scheduling, insurance eligibility and benefits verification, and patient billing. What sets it apart is the breadth of capabilities. Existing voice automation is built for simple operations with rigid rule trees that ultimately allow you to only automate a small portion of this work. Prosper is built for the combinatorial complexity of large specialty care groups: 10+ locations, 100+ appointment types, 1000+ insurance plan combinations. It handles patient, provider, payor, pharmacy, and pharma conversations in one system, writing structured data into the practice’s tools, navigating payor portals when there’s no API to call, and escalating work to human staff only when an AI agent can’t finish it. What comes out the other side, much sooner, is a financially cleared patient appointment.

Last generation voice agents were never truly end-to-end service providers. Each tool picked a lane and stopped there. But healthcare administrative staff don’t work like this – they’ll only trust a platform that can be their first line of defense for any phone call they handle. We have been looking for a team building this; we have been looking for Prosper.

In under two years, Prosper has gone from launch to a growing roster of leading specialty practices across the country, and signed channel partnerships with major EHR and RCM vendors that put it in front of hundreds of thousands of providers and millions of phone calls. Revenue is compounding fast, and the value shows up where it counts: a jump in scheduled and paid appointments, without further burdening clinic staff. In a market full of voice AI demos, Prosper is one of the few converting interest into business-critical, sticky deployments.

At the heart of all of this are co-founders Xavier and Josep, who have felt every pain point Prosper solves. Xavier grew up inside his family’s medical practice before going on to run large-scale call center operations at Handy (acquired by Angi, NASDAQ: ANGI). Josep is a former MIT CSAIL researcher who led product at CoverWallet (acquired by Aon, NYSE: AON), where he digitized distribution for some of the largest insurance lines in the U.S. They understand provider operations, call center logistics, and insurance company workflows from the inside—and they’ve assembled a deeply technical team with whom they are deploying Prosper into the world.

We led Prosper’s $30M Series A because fixing healthcare’s phone call crisis is how you rebuild the administrative core of healthcare globally. Every scheduling, eligibility, and billing conversation is a consequential decision point—care happens or it doesn’t, the provider gets paid or doesn’t—and Prosper is the essential infrastructure at the center of it all.

Go forth and Prosper.

Infinite Healthcare

Science at the speed of inference

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