Lassie Raises $35M Series A to Build AI Agents That Handle Medical Practice Administration

Lassie, a startup building autonomous AI systems designed to handle administrative work for small businesses, has raised a $35 million Series A round led by Andreessen Horowitz (a16z). The financing brings the company’s total funding to $47 million and comes as interest in AI agents continues to shift from simple assistants toward systems capable of completing entire business processes with minimal human involvement.

Founded by former product leaders from Robinhood, Coinbase, and Superhuman, Lassie is pursuing an ambitious vision: software that doesn’t simply help businesses operate, but actively runs portions of those businesses on their behalf.

Starting with One of Healthcare’s Biggest Administrative Problems

While many AI startups are building general-purpose agents, Lassie has focused on a highly specific challenge: the administrative burden facing independent medical and dental practices.

According to the company, a typical practice can lose more than 100 hours each month to administrative work and may spend roughly $200,000 annually on staffing dedicated to back-office operations. Lassie’s software is designed to automate many of those tasks by navigating insurance portals, retrieving reimbursement information, reconciling payments, updating practice management systems, and verifying funds received in bank accounts.

The company reports that its technology is already operating in more than 700 medical and dental practices across 49 U.S. states and is currently responsible for over 250,000 hours of labor annually.

From Software Tools to Autonomous Operations

The broader significance of Lassie’s approach extends beyond healthcare.

Traditional business software typically organizes information and provides workflows, but employees still perform the underlying work. Lassie is part of a growing wave of companies attempting to build autonomous systems that execute those workflows directly.

On its platform today, Lassie handles tasks such as electronic payment enrollment, payment reconciliation, posting transactions into practice management systems, appeals processing, reporting, and administrative follow-up work. The company says its systems can complete the majority of payment posting autonomously while escalating exceptions that require human review.

This reflects a broader trend emerging across enterprise AI: moving beyond copilots and assistants toward agents capable of carrying out end-to-end business processes.

Built from Real-World Observation

Lassie’s origins are somewhat unusual compared to many venture-backed AI startups.

According to reports, CEO and co-founder Steijn Pelle first became aware of the problem after hearing about the operational challenges facing a local dental practice. Rather than immediately building software, Pelle reportedly embedded himself within the practice to learn the administrative workflows firsthand. Those observations eventually became the foundation for the company’s automation platform.

That hands-on approach appears to have helped the company identify a category where AI could generate measurable financial value. Practices using the platform have reported significant reductions in administrative workloads, while some have used the recovered time to expand operations and serve more patients.

Beyond Doctors’ Offices

Although healthcare is currently Lassie’s primary market, the company has made clear that it views medical practices as only the starting point. Its long-term objective is to develop autonomous systems capable of handling operational work across a wide range of small businesses.

That vision aligns with a larger shift occurring across the AI industry. As models become more capable of navigating software systems, interpreting documents, and executing multi-step workflows, startups are increasingly exploring whether entire categories of administrative work can be automated rather than merely accelerated.

Whether that future arrives as quickly as proponents expect remains to be seen. What is clear is that investors are increasingly betting that the next major wave of business software will not simply help employees do their jobs more efficiently—it will perform portions of those jobs itself. Lassie’s latest funding round suggests that, at least for healthcare administration, that transition may already be underway.