Lassie review: 65/100

Lassie is an AI agent that runs the repetitive parts of a dental back office on its own. It logs into payer portals, pulls remittances, posts payments, and reconciles EFT deposits directly inside your practice management system, whether that is Dentrix, Eaglesoft, or Open Dental. The founders came out of Robinhood, Coinbase, Uber, and Superhuman, and they built the first version by hand-posting payments inside a real dental office.

It has raised around $47 million, led by Andreessen Horowitz, and says it now works with more than 700 practices across 49 states. Pricing is not published. Lassie charges based on the work it does for your office, with reported costs starting around $10,000 a year per practice, so you will need a quote.

The honest limit is scope. Lassie automates the clean, high-volume work and hands the rest, such as denials, appeals, and stuck claims, back to your team as a list to work. If you want technology that removes most of the manual posting, it is one of the most capable options here. If you want a service that owns the whole queue, it is a different model, and there is very little independent review data on it so far.

Lassie is an autonomous agent, which is a stronger claim than most automation tools make. Instead of handing your staff a smarter dashboard, it logs into payer portals, retrieves remittances, posts payments line by line, and reconciles EFT deposits directly inside Dentrix, Eaglesoft, or Open Dental. The company says it clears around 98% of payments without a person touching them. The founders, who came out of Robinhood, Coinbase, Uber, and Superhuman, built the first version by literally posting payments by hand in a working dental office, then automated what they had learned. The result behaves less like software you operate and more like a worker that operates your software.

The honest boundary is scope. Lassie is very good at the clean, repetitive, high-volume work, and it deliberately hands back everything else. Denials, appeals, stuck claims, and anything that needs a human to call a payer or rework a claim surface as a task list for your front desk. So while the posting and reconciliation burden largely disappears, the judgment-heavy 2% does not, and that 2% is often where the money and the frustration actually live. A practice adopting Lassie should plan for who on staff clears that queue, because the tool will not.

Integration depth is a real differentiator. Plenty of vendors claim PMS compatibility through a data export or a clearinghouse hop; Lassie works inside the legacy systems most offices already run, which is why it can post at the line-item level and reconcile against actual bank activity rather than just marking claims closed. Banking data is handled through secure connections rather than shared credentials in a spreadsheet. For an office that has been burned by a tool that only half-fits its PMS, the fact that Lassie was built around Dentrix, Eaglesoft, and Open Dental specifically is part of the pitch.

Adoption is ahead of the evidence base. Lassie reports more than 700 practices across 49 states and over $10 million in ARR, backed by roughly $47 million led by Andreessen Horowitz, so the momentum is genuine. What is missing is independent verification: there are effectively no third-party customer reviews to corroborate the 98% figure or the day-to-day experience. The venture backing tells you investors believe in the model, not that the posting is flawless in your specific payer mix. Anyone evaluating it should ask for reference customers on their own PMS and confirm the exception rate against their own claim complexity.